Merge branch 'master' into german

TestNets.md

@@ -52,14 +52,13 @@
 
 ## Single-node testnet
 
-A single-node testnet is possible with code modifications, for basic testing, or to more easily start a new testnet.
+A single-node testnet is possible with an additional settings, or to more easily start a new testnet.
-To do so, follow these steps:
+Just add this setting:
-- Comment out the `if (mintedLastBlock) { }` conditional in BlockMinter.java
+```
-- Comment out the `minBlockchainPeers` validation in Settings.validate()
+"singleNodeTestnet": true
-- Set `minBlockchainPeers` to 0 in settings.json
+```
-- Set `Synchronizer.RECOVERY_MODE_TIMEOUT` to `0`
+This will automatically allow multiple consecutive blocks to be minted, as well as setting minBlockchainPeers to 0.
-- All other steps should remain the same. Only a single reward share key is needed.
+Remember to put these values back after introducing other nodes
-- Remember to put these values back after introducing other nodes
 
 ## Fixed network
 
@@ -93,3 +92,32 @@ Your options are:
 - `qort` tool, but prepend with one-time shell variable: `BASE_URL=some-node-hostname-or-ip:port qort ......`
 - `peer-heights`, but use `-t` option, or `BASE_URL` shell variable as above
 
+## Example settings-test.json
+```
+{
+  "isTestNet": true,
+  "bitcoinNet": "TEST3",
+  "repositoryPath": "db-testnet",
+  "blockchainConfig": "testchain.json",
+  "minBlockchainPeers": 1,
+  "apiDocumentationEnabled": true,
+  "apiRestricted": false,
+  "bootstrap": false,
+  "maxPeerConnectionTime": 999999999,
+  "localAuthBypassEnabled": true,
+  "singleNodeTestnet": true,
+  "recoveryModeTimeout": 0
+}
+```
+
+## Quick start
+Here are some steps to quickly get a single node testnet up and running with a generic minting account:
+1. Start with template `settings-test.json`, and create a `testchain.json` based on mainnet's blockchain.json (or obtain one from Qortal developers). These should be in the same directory as the jar.
+2. Make sure feature triggers and other timestamp/height activations are correctly set. Generally these would be `0` so that they are enabled from the start.
+3. Set a recent genesis `timestamp` in testchain.json, and add this reward share entry:
+`{ "type": "REWARD_SHARE", "minterPublicKey": "DwcUnhxjamqppgfXCLgbYRx8H9XFPUc2qYRy3CEvQWEw", "recipient": "QbTDMss7NtRxxQaSqBZtSLSNdSYgvGaqFf", "rewardSharePublicKey": "CRvQXxFfUMfr4q3o1PcUZPA4aPCiubBsXkk47GzRo754", "sharePercent": 0 },`
+4. Start the node, passing in settings-test.json, e.g: `java -jar qortal.jar settings-test.json`
+5. Once started, add the corresponding minting key to the node:
+`curl -X POST "http://localhost:62391/admin/mintingaccounts" -d "F48mYJycFgRdqtc58kiovwbcJgVukjzRE4qRRtRsK9ix"`
+6. Alternatively you can use your own minting account instead of the generic one above.
+7. After a short while, blocks should be minted from the genesis timestamp until the current time.

WindowsInstaller/Qortal.aip

@@ -17,10 +17,10 @@
     <ROW Property="Manufacturer" Value="Qortal"/>
     <ROW Property="MsiLogging" MultiBuildValue="DefaultBuild:vp"/>
     <ROW Property="NTP_GOOD" Value="false"/>
-    <ROW Property="ProductCode" Value="1033:{0D69BF4B-1E5B-4CA8-87B4-EB4FF79B25C3} 1049:{4F5AA833-0C13-4F77-882F-150DE9AB1CC9} 2052:{9C1AC280-B306-4119-8BA7-FFF88BE7D434} 2057:{11A05F71-8A35-4A60-A4D2-A46EC63AF413} " Type="16"/>
+    <ROW Property="ProductCode" Value="1033:{6C93A96C-E3AF-42FD-BE11-7EC3734905C6} 1049:{754F5347-82E5-4251-AED0-F4141CDD11F5} 2052:{413BD7B3-A3F8-47D0-BCA4-5C7694A40936} 2057:{71450AC8-1E6F-4469-852D-0591FA693680} " Type="16"/>
     <ROW Property="ProductLanguage" Value="2057"/>
     <ROW Property="ProductName" Value="Qortal"/>
-    <ROW Property="ProductVersion" Value="3.3.7" Type="32"/>
+    <ROW Property="ProductVersion" Value="3.8.3" Type="32"/>
     <ROW Property="RECONFIG_NTP" Value="true"/>
     <ROW Property="REMOVE_BLOCKCHAIN" Value="YES" Type="4"/>
     <ROW Property="REPAIR_BLOCKCHAIN" Value="YES" Type="4"/>
@@ -212,7 +212,7 @@
     <ROW Component="ADDITIONAL_LICENSE_INFO_71" ComponentId="{12A3ADBE-BB7A-496C-8869-410681E6232F}" Directory_="jdk.zipfs_Dir" Attributes="0" KeyPath="ADDITIONAL_LICENSE_INFO_71" Type="0"/>
     <ROW Component="ADDITIONAL_LICENSE_INFO_8" ComponentId="{D53AD95E-CF96-4999-80FC-5812277A7456}" Directory_="java.naming_Dir" Attributes="0" KeyPath="ADDITIONAL_LICENSE_INFO_8" Type="0"/>
     <ROW Component="ADDITIONAL_LICENSE_INFO_9" ComponentId="{6B7EA9B0-5D17-47A8-B78C-FACE86D15E01}" Directory_="java.net.http_Dir" Attributes="0" KeyPath="ADDITIONAL_LICENSE_INFO_9" Type="0"/>
-    <ROW Component="AI_CustomARPName" ComponentId="{2DD67E39-9AFB-4821-AE3E-6186A20826B2}" Directory_="APPDIR" Attributes="260" KeyPath="DisplayName" Options="1"/>
+    <ROW Component="AI_CustomARPName" ComponentId="{EC7B4AD9-F2D9-48C4-A586-C4697D9C380C}" Directory_="APPDIR" Attributes="260" KeyPath="DisplayName" Options="1"/>
     <ROW Component="AI_ExePath" ComponentId="{3644948D-AE0B-41BB-9FAF-A79E70490A08}" Directory_="APPDIR" Attributes="260" KeyPath="AI_ExePath"/>
     <ROW Component="APPDIR" ComponentId="{680DFDDE-3FB4-47A5-8FF5-934F576C6F91}" Directory_="APPDIR" Attributes="0"/>
     <ROW Component="AccessBridgeCallbacks.h" ComponentId="{288055D1-1062-47A3-AA44-5601B4E38AED}" Directory_="bridge_Dir" Attributes="0" KeyPath="AccessBridgeCallbacks.h" Type="0"/>
@@ -1173,7 +1173,7 @@
     <ROW Action="AI_STORE_LOCATION" Type="51" Source="ARPINSTALLLOCATION" Target="[APPDIR]"/>
     <ROW Action="AI_SetPermissions" Type="11265" Source="userAccounts.dll" Target="OnSetPermissions" WithoutSeq="true"/>
     <ROW Action="CustomizeLog4j2PropertiesScript" Type="3109" Target="Script Text" TargetUnformatted="var actionData = Session.Property(&quot;CustomActionData&quot;);&#13;&#10;var actionDataArray = actionData.split(&quot;|&quot;);&#13;&#10;var appDir = actionDataArray[0];&#13;&#10;var dataFolder = actionDataArray[1] + actionDataArray[2] + &quot;\\&quot;;&#13;&#10;&#13;&#10;var ForReading = 1, ForWriting = 2, ForAppending = 8;&#13;&#10;var fso = new ActiveXObject(&quot;Scripting.FileSystemObject&quot;);&#13;&#10;&#13;&#10;// Make copy&#13;&#10;fso.CopyFile(appDir + &quot;log4j2.properties&quot;, appDir + &quot;log4j2-orig.properties&quot;, true); // overwrite&#13;&#10;&#13;&#10;// Rewrite %AppDir%\log4j2.properties to update logfile storage path&#13;&#10;var fin = fso.OpenTextFile(appDir + &quot;log4j2-orig.properties&quot;, ForReading, false); // no create&#13;&#10;var fout = fso.OpenTextFile(appDir + &quot;log4j2.properties&quot;, ForWriting, true); // can create&#13;&#10;&#13;&#10;// Copy lines with rewriting where necessary&#13;&#10;while( !fin.AtEndOfStream ) {&#13;&#10;&#9;var line = fin.ReadLine();&#13;&#10;&#13;&#10;&#9;var start = line.indexOf(&quot;property.dirname&quot;);&#13;&#10;&#9;if (start &gt; 0) {&#13;&#10;&#9;&#9;// line: # property.dirname = ...appdata...&#13;&#10;&#9;&#9;// uncomment/replace this line for Windows&#13;&#10;&#9;&#9;fout.WriteLine( &quot;property.dirname = &quot; + dataFolder.split(&apos;\\&apos;).join(&apos;\\\\&apos;) );&#13;&#10;&#9;} else {&#13;&#10;&#9;&#9;// not found - output verbatim&#13;&#10;&#9;&#9;fout.WriteLine( line );&#13;&#10;&#9;}&#13;&#10;}&#13;&#10;&#13;&#10;fin.Close();&#13;&#10;fout.Close();&#13;&#10;" AdditionalSeq="AI_DATA_SETTER_4"/>
-    <ROW Action="CustomizeSettingsJsonScript" Type="3109" Target="Script Text" TargetUnformatted="var actionData = Session.Property(&quot;CustomActionData&quot;);&#13;&#10;var actionDataArray = actionData.split(&quot;|&quot;);&#13;&#10;var appDir = actionDataArray[0];&#13;&#10;var dataFolder = actionDataArray[1] + actionDataArray[2] + &quot;\\&quot;;&#13;&#10;&#13;&#10;var ForReading = 1, ForWriting = 2, ForAppending = 8;&#13;&#10;var fso = new ActiveXObject(&quot;Scripting.FileSystemObject&quot;);&#13;&#10;&#13;&#10;// Create basic %APPDIR%\settings.json with path to real settings.json in dataFolder&#13;&#10;var fts = fso.OpenTextFile(appDir + &quot;settings.json&quot;, ForWriting, true);&#13;&#10;&#13;&#10;fts.WriteLine( &quot;{&quot; );&#13;&#10;// We need to escape Windows path backslashes to keep JSON valid&#13;&#10;fts.WriteLine( &quot;  \&quot;userPath\&quot;: \&quot;&quot; + dataFolder.split(&apos;\\&apos;).join(&apos;\\\\&apos;) + &quot;\&quot;&quot; );&#13;&#10;fts.WriteLine( &quot;}&quot; );&#13;&#10;&#13;&#10;fts.Close();&#13;&#10;&#13;&#10;// Make copy&#13;&#10;fso.CopyFile(dataFolder + &quot;settings.json&quot;, dataFolder + &quot;settings-orig.json&quot;, true); // overwrite&#13;&#10;&#13;&#10;// Rewrite settings.json to update repository path&#13;&#10;var fin = fso.OpenTextFile(dataFolder + &quot;settings-orig.json&quot;, ForReading, false);&#13;&#10;var fout = fso.OpenTextFile(dataFolder + &quot;settings.json&quot;, ForWriting, true);&#13;&#10;&#13;&#10;// First line should contain opening brace&#13;&#10;fout.WriteLine( fin.ReadLine() );&#13;&#10;&#13;&#10;// Append our entries&#13;&#10;fout.WriteLine( &quot;  \&quot;repositoryPath\&quot;: \&quot;&quot; + dataFolder.split(&apos;\\&apos;).join(&apos;\\\\&apos;) + &quot;db\&quot;,&quot; );&#13;&#10;fout.WriteLine( &quot;  \&quot;dataPath\&quot;: \&quot;&quot; + dataFolder.split(&apos;\\&apos;).join(&apos;\\\\&apos;) + &quot;data\&quot;,&quot; );&#13;&#10;&#13;&#10;// copy rest of settings&#13;&#10;while( !fin.AtEndOfStream ) {&#13;&#10;&#9;fout.WriteLine( fin.ReadLine() );&#13;&#10;}&#13;&#10;&#13;&#10;fin.Close();&#13;&#10;fout.Close();&#13;&#10;" AdditionalSeq="AI_DATA_SETTER_3"/>
+    <ROW Action="CustomizeSettingsJsonScript" Type="3109" Target="Script Text" TargetUnformatted="var actionData = Session.Property(&quot;CustomActionData&quot;);&#13;&#10;var actionDataArray = actionData.split(&quot;|&quot;);&#13;&#10;var appDir = actionDataArray[0];&#13;&#10;var dataFolder = actionDataArray[1] + actionDataArray[2] + &quot;\\&quot;;&#13;&#10;&#13;&#10;var ForReading = 1, ForWriting = 2, ForAppending = 8;&#13;&#10;var fso = new ActiveXObject(&quot;Scripting.FileSystemObject&quot;);&#13;&#10;&#13;&#10;// Create basic %APPDIR%\settings.json with path to real settings.json in dataFolder&#13;&#10;var fts = fso.OpenTextFile(appDir + &quot;settings.json&quot;, ForWriting, true);&#13;&#10;&#13;&#10;fts.WriteLine( &quot;{&quot; );&#13;&#10;// We need to escape Windows path backslashes to keep JSON valid&#13;&#10;fts.WriteLine( &quot;  \&quot;userPath\&quot;: \&quot;&quot; + dataFolder.split(&apos;\\&apos;).join(&apos;\\\\&apos;) + &quot;\&quot;&quot; );&#13;&#10;fts.WriteLine( &quot;}&quot; );&#13;&#10;&#13;&#10;fts.Close();&#13;&#10;&#13;&#10;// Make copy&#13;&#10;fso.CopyFile(dataFolder + &quot;settings.json&quot;, dataFolder + &quot;settings-orig.json&quot;, true); // overwrite&#13;&#10;&#13;&#10;// Rewrite settings.json to update repository path&#13;&#10;var fin = fso.OpenTextFile(dataFolder + &quot;settings-orig.json&quot;, ForReading, false);&#13;&#10;var fout = fso.OpenTextFile(dataFolder + &quot;settings.json&quot;, ForWriting, true);&#13;&#10;&#13;&#10;// First line should contain opening brace&#13;&#10;fout.WriteLine( fin.ReadLine() );&#13;&#10;&#13;&#10;// Append our entries&#13;&#10;fout.WriteLine( &quot;  \&quot;repositoryPath\&quot;: \&quot;&quot; + dataFolder.split(&apos;\\&apos;).join(&apos;\\\\&apos;) + &quot;db\&quot;,&quot; );&#13;&#10;fout.WriteLine( &quot;  \&quot;dataPath\&quot;: \&quot;&quot; + dataFolder.split(&apos;\\&apos;).join(&apos;\\\\&apos;) + &quot;data\&quot;,&quot; );&#13;&#10;fout.WriteLine( &quot;  \&quot;walletsPath\&quot;: \&quot;&quot; + dataFolder.split(&apos;\\&apos;).join(&apos;\\\\&apos;) + &quot;wallets\&quot;,&quot; );&#13;&#10;fout.WriteLine( &quot;  \&quot;listsPath\&quot;: \&quot;&quot; + dataFolder.split(&apos;\\&apos;).join(&apos;\\\\&apos;) + &quot;lists\&quot;,&quot; );&#13;&#10;&#13;&#10;// copy rest of settings&#13;&#10;while( !fin.AtEndOfStream ) {&#13;&#10;&#9;fout.WriteLine( fin.ReadLine() );&#13;&#10;}&#13;&#10;&#13;&#10;fin.Close();&#13;&#10;fout.Close();&#13;&#10;" AdditionalSeq="AI_DATA_SETTER_3"/>
     <ROW Action="DetectRunningProcess" Type="1" Source="aicustact.dll" Target="DetectProcess" Options="3" AdditionalSeq="AI_DATA_SETTER_8"/>
     <ROW Action="DetectW32Time" Type="1" Source="aicustact.dll" Target="DetectService" Options="3" AdditionalSeq="AI_DATA_SETTER_11"/>
     <ROW Action="NTP_config" Type="3090" Source="ntpcfg.bat"/>

lib/org/ciyam/AT/1.4.0/AT-1.4.0.pom

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>org.ciyam</groupId>
+  <artifactId>AT</artifactId>
+  <version>1.4.0</version>
+  <description>POM was created from install:install-file</description>
+</project>

lib/org/ciyam/AT/maven-metadata-local.xml

@@ -3,14 +3,15 @@
   <groupId>org.ciyam</groupId>
   <artifactId>AT</artifactId>
   <versioning>
-    <release>1.3.8</release>
+    <release>1.4.0</release>
     <versions>
       <version>1.3.4</version>
       <version>1.3.5</version>
       <version>1.3.6</version>
       <version>1.3.7</version>
       <version>1.3.8</version>
+      <version>1.4.0</version>
     </versions>
-    <lastUpdated>20200925114415</lastUpdated>
+    <lastUpdated>20221105114346</lastUpdated>
   </versioning>
 </metadata>

pom.xml

@@ -3,15 +3,15 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.qortal</groupId>
 	<artifactId>qortal</artifactId>
-	<version>3.3.7</version>
+	<version>3.8.4</version>
 	<packaging>jar</packaging>
 	<properties>
 		<skipTests>true</skipTests>
-		<altcoinj.version>6628cfd</altcoinj.version>
+		<altcoinj.version>7dc8c6f</altcoinj.version>
 		<bitcoinj.version>0.15.10</bitcoinj.version>
-		<bouncycastle.version>1.64</bouncycastle.version>
+		<bouncycastle.version>1.69</bouncycastle.version>
 		<build.timestamp>${maven.build.timestamp}</build.timestamp>
-		<ciyam-at.version>1.3.8</ciyam-at.version>
+		<ciyam-at.version>1.4.0</ciyam-at.version>
 		<commons-net.version>3.6</commons-net.version>
 		<commons-text.version>1.8</commons-text.version>
 		<commons-io.version>2.6</commons-io.version>
@@ -34,6 +34,8 @@
 		<package-info-maven-plugin.version>1.1.0</package-info-maven-plugin.version>
 		<jsoup.version>1.13.1</jsoup.version>
 		<java-diff-utils.version>4.10</java-diff-utils.version>
+		<grpc.version>1.45.1</grpc.version>
+		<protobuf.version>3.19.4</protobuf.version>
 	</properties>
 	<build>
 		<sourceDirectory>src/main/java</sourceDirectory>
@@ -705,5 +707,25 @@
 			<artifactId>java-diff-utils</artifactId>
 			<version>${java-diff-utils.version}</version>
 		</dependency>
+		<dependency>
+			<groupId>io.grpc</groupId>
+			<artifactId>grpc-netty</artifactId>
+			<version>${grpc.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>io.grpc</groupId>
+			<artifactId>grpc-protobuf</artifactId>
+			<version>${grpc.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>io.grpc</groupId>
+			<artifactId>grpc-stub</artifactId>
+			<version>${grpc.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>com.google.protobuf</groupId>
+			<artifactId>protobuf-java</artifactId>
+			<version>${protobuf.version}</version>
+		</dependency>
 	</dependencies>
 </project>

src/main/java/com/rust/litewalletjni/LiteWalletJni.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * LiteWalletJni code based on https://github.com/PirateNetwork/cordova-plugin-litewallet
+ *
+ * MIT License
+ *
+ * Copyright (c) 2020 Zero Currency Coin
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.rust.litewalletjni;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.qortal.controller.PirateChainWalletController;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+public class LiteWalletJni {
+
+    protected static final Logger LOGGER = LogManager.getLogger(LiteWalletJni.class);
+
+    public static native String initlogging();
+    public static native String initnew(final String serveruri, final String params, final String saplingOutputb64, final String saplingSpendb64);
+    public static native String initfromseed(final String serveruri, final String params, final String seed, final String birthday, final String saplingOutputb64, final String saplingSpendb64);
+    public static native String initfromb64(final String serveruri, final String params, final String datab64, final String saplingOutputb64, final String saplingSpendb64);
+    public static native String save();
+
+    public static native String execute(final String cmd, final String args);
+    public static native String getseedphrase();
+    public static native String getseedphrasefromentropyb64(final String entropy64);
+    public static native String checkseedphrase(final String input);
+
+
+    private static boolean loaded = false;
+
+    public static void loadLibrary() {
+        if (loaded) {
+            return;
+        }
+        String osName = System.getProperty("os.name");
+        String osArchitecture = System.getProperty("os.arch");
+
+        LOGGER.info("OS Name: {}", osName);
+        LOGGER.info("OS Architecture: {}", osArchitecture);
+
+        try {
+            String libFileName = PirateChainWalletController.getRustLibFilename();
+            if (libFileName == null) {
+                LOGGER.info("Library not found for OS: {}, arch: {}", osName, osArchitecture);
+                return;
+            }
+
+            Path libPath = Paths.get(PirateChainWalletController.getRustLibOuterDirectory().toString(), libFileName);
+            System.load(libPath.toAbsolutePath().toString());
+            loaded = true;
+        }
+        catch (UnsatisfiedLinkError e) {
+            LOGGER.info("Unable to load library");
+        }
+    }
+
+    public static boolean isLoaded() {
+        return loaded;
+    }
+
+}

src/main/java/org/qortal/ApplyUpdate.java

@@ -8,6 +8,7 @@ import java.nio.file.Paths;
 import java.nio.file.StandardCopyOption;
 import java.security.Security;
 import java.util.*;
+import java.util.stream.Collectors;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -18,6 +19,8 @@ import org.qortal.api.ApiRequest;
 import org.qortal.controller.AutoUpdate;
 import org.qortal.settings.Settings;
 
+import static org.qortal.controller.AutoUpdate.AGENTLIB_JVM_HOLDER_ARG;
+
 public class ApplyUpdate {
 
 	static {
@@ -197,6 +200,11 @@ public class ApplyUpdate {
 			// JVM arguments
 			javaCmd.addAll(ManagementFactory.getRuntimeMXBean().getInputArguments());
 
+			// Reapply any retained, but disabled, -agentlib JVM arg
+			javaCmd = javaCmd.stream()
+					.map(arg -> arg.replace(AGENTLIB_JVM_HOLDER_ARG, "-agentlib"))
+					.collect(Collectors.toList());
+
 			// Call mainClass in JAR
 			javaCmd.addAll(Arrays.asList("-jar", JAR_FILENAME));
 
@@ -205,7 +213,7 @@ public class ApplyUpdate {
 		}
 
 		try {
-			LOGGER.info(() -> String.format("Restarting node with: %s", String.join(" ", javaCmd)));
+			LOGGER.info(String.format("Restarting node with: %s", String.join(" ", javaCmd)));
 
 			ProcessBuilder processBuilder = new ProcessBuilder(javaCmd);
 
@@ -214,8 +222,15 @@ public class ApplyUpdate {
 				processBuilder.environment().put(JAVA_TOOL_OPTIONS_NAME, JAVA_TOOL_OPTIONS_VALUE);
 			}
 
-			processBuilder.start();
+			// New process will inherit our stdout and stderr
-		} catch (IOException e) {
+			processBuilder.redirectOutput(ProcessBuilder.Redirect.INHERIT);
+			processBuilder.redirectError(ProcessBuilder.Redirect.INHERIT);
+
+			Process process = processBuilder.start();
+
+			// Nothing to pipe to new process, so close output stream (process's stdin)
+			process.getOutputStream().close();
+		} catch (Exception e) {
 			LOGGER.error(String.format("Failed to restart node (BAD): %s", e.getMessage()));
 		}
 	}

src/main/java/org/qortal/account/Account.java

@@ -211,7 +211,8 @@ public class Account {
 		if (level != null && level >= BlockChain.getInstance().getMinAccountLevelToMint())
 			return true;
 
-		if (Account.isFounder(accountData.getFlags()))
+		// Founders can always mint, unless they have a penalty
+		if (Account.isFounder(accountData.getFlags()) && accountData.getBlocksMintedPenalty() == 0)
 			return true;
 
 		return false;
@@ -222,6 +223,11 @@ public class Account {
 		return this.repository.getAccountRepository().getMintedBlockCount(this.address);
 	}
 
+	/** Returns account's blockMintedPenalty or null if account not found in repository. */
+	public Integer getBlocksMintedPenalty() throws DataException {
+		return this.repository.getAccountRepository().getBlocksMintedPenaltyCount(this.address);
+	}
+
 
 	/** Returns whether account can build reward-shares.
 	 * <p>
@@ -243,7 +249,7 @@ public class Account {
 		if (level != null && level >= BlockChain.getInstance().getMinAccountLevelToRewardShare())
 			return true;
 
-		if (Account.isFounder(accountData.getFlags()))
+		if (Account.isFounder(accountData.getFlags()) && accountData.getBlocksMintedPenalty() == 0)
 			return true;
 
 		return false;
@@ -271,7 +277,7 @@ public class Account {
 	/**
 	 * Returns 'effective' minting level, or zero if account does not exist/cannot mint.
 	 * <p>
-	 * For founder accounts, this returns "founderEffectiveMintingLevel" from blockchain config.
+	 * For founder accounts with no penalty, this returns "founderEffectiveMintingLevel" from blockchain config.
 	 * 
 	 * @return 0+
 	 * @throws DataException
@@ -281,7 +287,8 @@ public class Account {
 		if (accountData == null)
 			return 0;
 
-		if (Account.isFounder(accountData.getFlags()))
+		// Founders are assigned a different effective minting level, as long as they have no penalty
+		if (Account.isFounder(accountData.getFlags()) && accountData.getBlocksMintedPenalty() == 0)
 			return BlockChain.getInstance().getFounderEffectiveMintingLevel();
 
 		return accountData.getLevel();
@@ -289,8 +296,6 @@ public class Account {
 
 	/**
 	 * Returns 'effective' minting level, or zero if reward-share does not exist.
-	 * <p>
-	 * this is being used on src/main/java/org/qortal/api/resource/AddressesResource.java to fulfil the online accounts api call
 	 * 
 	 * @param repository
 	 * @param rewardSharePublicKey
@@ -309,7 +314,7 @@ public class Account {
 	/**
 	 * Returns 'effective' minting level, with a fix for the zero level.
 	 * <p>
-	 * For founder accounts, this returns "founderEffectiveMintingLevel" from blockchain config.
+	 * For founder accounts with no penalty, this returns "founderEffectiveMintingLevel" from blockchain config.
 	 *
 	 * @param repository
 	 * @param rewardSharePublicKey
@@ -322,7 +327,7 @@ public class Account {
 		if (rewardShareData == null)
 			return 0;
 
-		else if(!rewardShareData.getMinter().equals(rewardShareData.getRecipient()))//the minter is different than the recipient this means sponsorship
+		else if (!rewardShareData.getMinter().equals(rewardShareData.getRecipient())) // Sponsorship reward share
 			return 0;
 
 		Account rewardShareMinter = new Account(repository, rewardShareData.getMinter());

src/main/java/org/qortal/account/PrivateKeyAccount.java

@@ -11,15 +11,15 @@ public class PrivateKeyAccount extends PublicKeyAccount {
 	private final Ed25519PrivateKeyParameters edPrivateKeyParams;
 
 	/**
-	 * Create PrivateKeyAccount using byte[32] seed.
+	 * Create PrivateKeyAccount using byte[32] private key.
 	 * 
-	 * @param seed
+	 * @param privateKey
 	 *            byte[32] used to create private/public key pair
 	 * @throws IllegalArgumentException
-	 *             if passed invalid seed
+	 *             if passed invalid privateKey
 	 */
-	public PrivateKeyAccount(Repository repository, byte[] seed) {
+	public PrivateKeyAccount(Repository repository, byte[] privateKey) {
-		this(repository, new Ed25519PrivateKeyParameters(seed, 0));
+		this(repository, new Ed25519PrivateKeyParameters(privateKey, 0));
 	}
 
 	private PrivateKeyAccount(Repository repository, Ed25519PrivateKeyParameters edPrivateKeyParams) {
@@ -37,10 +37,6 @@ public class PrivateKeyAccount extends PublicKeyAccount {
 		return this.privateKey;
 	}
 
-	public static byte[] toPublicKey(byte[] seed) {
-		return new Ed25519PrivateKeyParameters(seed, 0).generatePublicKey().getEncoded();
-	}
-
 	public byte[] sign(byte[] message) {
 		return Crypto.sign(this.edPrivateKeyParams, message);
 	}

src/main/java/org/qortal/account/SelfSponsorshipAlgoV1.java

@@ -0,0 +1,367 @@
+package org.qortal.account;
+
+import org.qortal.api.resource.TransactionsResource;
+import org.qortal.asset.Asset;
+import org.qortal.data.account.AccountData;
+import org.qortal.data.naming.NameData;
+import org.qortal.data.transaction.*;
+import org.qortal.repository.DataException;
+import org.qortal.repository.Repository;
+import org.qortal.transaction.Transaction.TransactionType;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+public class SelfSponsorshipAlgoV1 {
+
+    private final Repository repository;
+    private final String address;
+    private final AccountData accountData;
+    private final long snapshotTimestamp;
+    private final boolean override;
+
+    private int registeredNameCount = 0;
+    private int suspiciousCount = 0;
+    private int suspiciousPercent = 0;
+    private int consolidationCount = 0;
+    private int bulkIssuanceCount = 0;
+    private int recentSponsorshipCount = 0;
+
+    private List<RewardShareTransactionData> sponsorshipRewardShares = new ArrayList<>();
+    private final Map<String, List<TransactionData>> paymentsByAddress = new HashMap<>();
+    private final Set<String> sponsees = new LinkedHashSet<>();
+    private Set<String> consolidatedAddresses = new LinkedHashSet<>();
+    private final Set<String> zeroTransactionAddreses = new LinkedHashSet<>();
+    private final Set<String> penaltyAddresses = new LinkedHashSet<>();
+
+    public SelfSponsorshipAlgoV1(Repository repository, String address, long snapshotTimestamp, boolean override) throws DataException {
+        this.repository = repository;
+        this.address = address;
+        this.accountData = this.repository.getAccountRepository().getAccount(this.address);
+        this.snapshotTimestamp = snapshotTimestamp;
+        this.override = override;
+    }
+
+    public String getAddress() {
+        return this.address;
+    }
+
+    public Set<String> getPenaltyAddresses() {
+        return this.penaltyAddresses;
+    }
+
+
+    public void run() throws DataException {
+        if (this.accountData == null) {
+            // Nothing to do
+            return;
+        }
+
+        this.fetchSponsorshipRewardShares();
+        if (this.sponsorshipRewardShares.isEmpty()) {
+            // Nothing to do
+            return;
+        }
+
+        this.findConsolidatedRewards();
+        this.findBulkIssuance();
+        this.findRegisteredNameCount();
+        this.findRecentSponsorshipCount();
+
+        int score = this.calculateScore();
+        if (score <= 0 && !override) {
+            return;
+        }
+
+        String newAddress = this.getDestinationAccount(this.address);
+        while (newAddress != null) {
+            // Found destination account
+            this.penaltyAddresses.add(newAddress);
+
+            // Run algo for this address, but in "override" mode because it has already been flagged
+            SelfSponsorshipAlgoV1 algoV1 = new SelfSponsorshipAlgoV1(this.repository, newAddress, this.snapshotTimestamp, true);
+            algoV1.run();
+            this.penaltyAddresses.addAll(algoV1.getPenaltyAddresses());
+
+            newAddress = this.getDestinationAccount(newAddress);
+        }
+
+        this.penaltyAddresses.add(this.address);
+
+        if (this.override || this.recentSponsorshipCount < 20) {
+            this.penaltyAddresses.addAll(this.consolidatedAddresses);
+            this.penaltyAddresses.addAll(this.zeroTransactionAddreses);
+        }
+        else {
+            this.penaltyAddresses.addAll(this.sponsees);
+        }
+    }
+
+    private String getDestinationAccount(String address) throws DataException {
+        List<TransactionData> transferPrivsTransactions = fetchTransferPrivsForAddress(address);
+        if (transferPrivsTransactions.isEmpty()) {
+            // No TRANSFER_PRIVS transactions for this address
+            return null;
+        }
+
+        AccountData accountData = this.repository.getAccountRepository().getAccount(address);
+        if (accountData == null) {
+            return null;
+        }
+
+        for (TransactionData transactionData : transferPrivsTransactions) {
+            TransferPrivsTransactionData transferPrivsTransactionData = (TransferPrivsTransactionData) transactionData;
+            if (Arrays.equals(transferPrivsTransactionData.getSenderPublicKey(), accountData.getPublicKey())) {
+                return transferPrivsTransactionData.getRecipient();
+            }
+        }
+
+        return null;
+    }
+
+    private void findConsolidatedRewards() throws DataException {
+        List<String> sponseesThatSentRewards = new ArrayList<>();
+        Map<String, Integer> paymentRecipients = new HashMap<>();
+
+        // Collect outgoing payments of each sponsee
+        for (String sponseeAddress : this.sponsees) {
+
+            // Firstly fetch all payments for address, since the functions below depend on this data
+            this.fetchPaymentsForAddress(sponseeAddress);
+
+            // Check if the address has zero relevant transactions
+            if (this.hasZeroTransactions(sponseeAddress)) {
+                this.zeroTransactionAddreses.add(sponseeAddress);
+            }
+
+            // Get payment recipients
+            List<String> allPaymentRecipients = this.fetchOutgoingPaymentRecipientsForAddress(sponseeAddress);
+            if (allPaymentRecipients.isEmpty()) {
+                continue;
+            }
+            sponseesThatSentRewards.add(sponseeAddress);
+
+            List<String> addressesPaidByThisSponsee = new ArrayList<>();
+            for (String paymentRecipient : allPaymentRecipients) {
+                if (addressesPaidByThisSponsee.contains(paymentRecipient)) {
+                    // We already tracked this association - don't allow multiple to stack up
+                    continue;
+                }
+                addressesPaidByThisSponsee.add(paymentRecipient);
+
+                // Increment count for this recipient, or initialize to 1 if not present
+                if (paymentRecipients.computeIfPresent(paymentRecipient, (k, v) -> v + 1) == null) {
+                    paymentRecipients.put(paymentRecipient, 1);
+                }
+            }
+
+        }
+
+        // Exclude addresses with a low number of payments
+        Map<String, Integer> filteredPaymentRecipients = paymentRecipients.entrySet().stream()
+                .filter(p -> p.getValue() != null && p.getValue() >= 10)
+                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+
+        // Now check how many sponsees have sent to this subset of addresses
+        Map<String, Integer> sponseesThatConsolidatedRewards = new HashMap<>();
+        for (String sponseeAddress : sponseesThatSentRewards) {
+            List<String> allPaymentRecipients = this.fetchOutgoingPaymentRecipientsForAddress(sponseeAddress);
+            // Remove any that aren't to one of the flagged recipients (i.e. consolidation)
+            allPaymentRecipients.removeIf(r -> !filteredPaymentRecipients.containsKey(r));
+
+            int count = allPaymentRecipients.size();
+            if (count == 0) {
+                continue;
+            }
+            if (sponseesThatConsolidatedRewards.computeIfPresent(sponseeAddress, (k, v) -> v + count) == null) {
+                sponseesThatConsolidatedRewards.put(sponseeAddress, count);
+            }
+        }
+
+        // Remove sponsees that have only sent a low number of payments to the filtered addresses
+        Map<String, Integer> filteredSponseesThatConsolidatedRewards = sponseesThatConsolidatedRewards.entrySet().stream()
+                .filter(p -> p.getValue() != null && p.getValue() >= 2)
+                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+
+        this.consolidationCount = sponseesThatConsolidatedRewards.size();
+        this.consolidatedAddresses = new LinkedHashSet<>(filteredSponseesThatConsolidatedRewards.keySet());
+        this.suspiciousCount = this.consolidationCount + this.zeroTransactionAddreses.size();
+        this.suspiciousPercent = (int)(this.suspiciousCount / (float) this.sponsees.size() * 100);
+    }
+
+    private void findBulkIssuance() {
+        Long lastTimestamp = null;
+        for (RewardShareTransactionData rewardShareTransactionData : sponsorshipRewardShares) {
+            long timestamp = rewardShareTransactionData.getTimestamp();
+            if (timestamp >= this.snapshotTimestamp) {
+                continue;
+            }
+
+            if (lastTimestamp != null) {
+                if (timestamp - lastTimestamp < 3*60*1000L) {
+                    this.bulkIssuanceCount++;
+                }
+            }
+            lastTimestamp = timestamp;
+        }
+    }
+
+    private void findRegisteredNameCount() throws DataException {
+        int registeredNameCount = 0;
+        for (String sponseeAddress : sponsees) {
+            List<NameData> names = repository.getNameRepository().getNamesByOwner(sponseeAddress);
+            for (NameData name : names) {
+                if (name.getRegistered() < this.snapshotTimestamp) {
+                    registeredNameCount++;
+                    break;
+                }
+            }
+        }
+        this.registeredNameCount = registeredNameCount;
+    }
+
+    private void findRecentSponsorshipCount() {
+        final long referenceTimestamp = this.snapshotTimestamp - (365 * 24 * 60 * 60 * 1000L);
+        int recentSponsorshipCount = 0;
+        for (RewardShareTransactionData rewardShare : sponsorshipRewardShares) {
+            if (rewardShare.getTimestamp() >= referenceTimestamp) {
+                recentSponsorshipCount++;
+            }
+        }
+        this.recentSponsorshipCount = recentSponsorshipCount;
+    }
+
+    private int calculateScore() {
+        final int suspiciousMultiplier = (this.suspiciousCount >= 100) ? this.suspiciousPercent : 1;
+        final int nameMultiplier = (this.sponsees.size() >= 50 && this.registeredNameCount == 0) ? 2 : 1;
+        final int consolidationMultiplier = Math.max(this.consolidationCount, 1);
+        final int bulkIssuanceMultiplier = Math.max(this.bulkIssuanceCount / 2, 1);
+        final int offset = 9;
+        return suspiciousMultiplier * nameMultiplier * consolidationMultiplier * bulkIssuanceMultiplier - offset;
+    }
+
+    private void fetchSponsorshipRewardShares() throws DataException {
+        List<RewardShareTransactionData> sponsorshipRewardShares = new ArrayList<>();
+
+        // Define relevant transactions
+        List<TransactionType> txTypes = List.of(TransactionType.REWARD_SHARE);
+        List<TransactionData> transactionDataList = fetchTransactions(repository, txTypes, this.address, false);
+
+        for (TransactionData transactionData : transactionDataList) {
+            if (transactionData.getType() != TransactionType.REWARD_SHARE) {
+                continue;
+            }
+
+            RewardShareTransactionData rewardShareTransactionData = (RewardShareTransactionData) transactionData;
+
+            // Skip removals
+            if (rewardShareTransactionData.getSharePercent() < 0) {
+                continue;
+            }
+
+            // Skip if not sponsored by this account
+            if (!Arrays.equals(rewardShareTransactionData.getCreatorPublicKey(), accountData.getPublicKey())) {
+                continue;
+            }
+
+            // Skip self shares
+            if (Objects.equals(rewardShareTransactionData.getRecipient(), this.address)) {
+                continue;
+            }
+
+            boolean duplicateFound = false;
+            for (RewardShareTransactionData existingRewardShare : sponsorshipRewardShares) {
+                if (Objects.equals(existingRewardShare.getRecipient(), rewardShareTransactionData.getRecipient())) {
+                    // Duplicate
+                    duplicateFound = true;
+                    break;
+                }
+            }
+            if (!duplicateFound) {
+                sponsorshipRewardShares.add(rewardShareTransactionData);
+                this.sponsees.add(rewardShareTransactionData.getRecipient());
+            }
+        }
+
+        this.sponsorshipRewardShares = sponsorshipRewardShares;
+    }
+
+    private List<TransactionData> fetchTransferPrivsForAddress(String address) throws DataException {
+        return fetchTransactions(repository,
+                List.of(TransactionType.TRANSFER_PRIVS),
+                address, true);
+    }
+
+    private void fetchPaymentsForAddress(String address) throws DataException {
+        List<TransactionData> payments = fetchTransactions(repository,
+                Arrays.asList(TransactionType.PAYMENT, TransactionType.TRANSFER_ASSET),
+                address, false);
+        this.paymentsByAddress.put(address, payments);
+    }
+
+    private List<String> fetchOutgoingPaymentRecipientsForAddress(String address) {
+        List<String> outgoingPaymentRecipients = new ArrayList<>();
+
+        List<TransactionData> transactionDataList = this.paymentsByAddress.get(address);
+        if (transactionDataList == null) transactionDataList = new ArrayList<>();
+        transactionDataList.removeIf(t -> t.getTimestamp() >= this.snapshotTimestamp);
+        for (TransactionData transactionData : transactionDataList) {
+            switch (transactionData.getType()) {
+
+                case PAYMENT:
+                    PaymentTransactionData paymentTransactionData = (PaymentTransactionData) transactionData;
+                    if (!Objects.equals(paymentTransactionData.getRecipient(), address)) {
+                        // Outgoing payment from this account
+                        outgoingPaymentRecipients.add(paymentTransactionData.getRecipient());
+                    }
+                    break;
+
+                case TRANSFER_ASSET:
+                    TransferAssetTransactionData transferAssetTransactionData = (TransferAssetTransactionData) transactionData;
+                    if (transferAssetTransactionData.getAssetId() == Asset.QORT) {
+                        if (!Objects.equals(transferAssetTransactionData.getRecipient(), address)) {
+                            // Outgoing payment from this account
+                            outgoingPaymentRecipients.add(transferAssetTransactionData.getRecipient());
+                        }
+                    }
+                    break;
+
+                default:
+                    break;
+            }
+        }
+
+        return outgoingPaymentRecipients;
+    }
+
+    private boolean hasZeroTransactions(String address) {
+        List<TransactionData> transactionDataList = this.paymentsByAddress.get(address);
+        if (transactionDataList == null) {
+            return true;
+        }
+        transactionDataList.removeIf(t -> t.getTimestamp() >= this.snapshotTimestamp);
+        return transactionDataList.size() == 0;
+    }
+
+    private static List<TransactionData> fetchTransactions(Repository repository, List<TransactionType> txTypes, String address, boolean reverse) throws DataException {
+        // Fetch all relevant transactions for this account
+        List<byte[]> signatures = repository.getTransactionRepository()
+                .getSignaturesMatchingCriteria(null, null, null, txTypes,
+                        null, null, address, TransactionsResource.ConfirmationStatus.CONFIRMED,
+                        null, null, reverse);
+
+        List<TransactionData> transactionDataList = new ArrayList<>();
+
+        for (byte[] signature : signatures) {
+            // Fetch transaction data
+            TransactionData transactionData = repository.getTransactionRepository().fromSignature(signature);
+            if (transactionData == null) {
+                continue;
+            }
+            transactionDataList.add(transactionData);
+        }
+
+        return transactionDataList;
+    }
+
+}

src/main/java/org/qortal/api/model/AccountPenaltyStats.java

@@ -0,0 +1,56 @@
+package org.qortal.api.model;
+
+import org.qortal.block.SelfSponsorshipAlgoV1Block;
+import org.qortal.data.account.AccountData;
+import org.qortal.data.naming.NameData;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlElement;
+import java.util.ArrayList;
+import java.util.List;
+
+@XmlAccessorType(XmlAccessType.FIELD)
+public class AccountPenaltyStats {
+
+	public Integer totalPenalties;
+	public Integer maxPenalty;
+	public Integer minPenalty;
+	public String penaltyHash;
+
+	protected AccountPenaltyStats() {
+	}
+
+	public AccountPenaltyStats(Integer totalPenalties, Integer maxPenalty, Integer minPenalty, String penaltyHash) {
+		this.totalPenalties = totalPenalties;
+		this.maxPenalty = maxPenalty;
+		this.minPenalty = minPenalty;
+		this.penaltyHash = penaltyHash;
+	}
+
+	public static AccountPenaltyStats fromAccounts(List<AccountData> accounts) {
+		int totalPenalties = 0;
+		Integer maxPenalty = null;
+		Integer minPenalty = null;
+
+		List<String> addresses = new ArrayList<>();
+		for (AccountData accountData : accounts) {
+			int penalty = accountData.getBlocksMintedPenalty();
+			addresses.add(accountData.getAddress());
+			totalPenalties++;
+
+			// Penalties are expressed as a negative number, so the min and the max are reversed here
+			if (maxPenalty == null || penalty < maxPenalty) maxPenalty = penalty;
+			if (minPenalty == null || penalty > minPenalty) minPenalty = penalty;
+		}
+
+		String penaltyHash = SelfSponsorshipAlgoV1Block.getHash(addresses);
+		return new AccountPenaltyStats(totalPenalties, maxPenalty, minPenalty, penaltyHash);
+	}
+
+
+	@Override
+	public String toString() {
+		return String.format("totalPenalties: %d, maxPenalty: %d, minPenalty: %d, penaltyHash: %s", totalPenalties, maxPenalty, minPenalty, penaltyHash == null ? "null" : penaltyHash);
+	}
+}

src/main/java/org/qortal/api/model/ConnectedPeer.java

@@ -1,7 +1,8 @@
 package org.qortal.api.model;
 
 import io.swagger.v3.oas.annotations.media.Schema;
-import org.qortal.data.network.PeerChainTipData;
+import org.qortal.controller.Controller;
+import org.qortal.data.block.BlockSummaryData;
 import org.qortal.data.network.PeerData;
 import org.qortal.network.Handshake;
 import org.qortal.network.Peer;
@@ -36,6 +37,7 @@ public class ConnectedPeer {
     public Long lastBlockTimestamp;
     public UUID connectionId;
     public String age;
+    public Boolean isTooDivergent;
 
     protected ConnectedPeer() {
     }
@@ -63,11 +65,16 @@ public class ConnectedPeer {
             this.age = "connecting...";
         }
 
-        PeerChainTipData peerChainTipData = peer.getChainTipData();
+        BlockSummaryData peerChainTipData = peer.getChainTipData();
         if (peerChainTipData != null) {
-            this.lastHeight = peerChainTipData.getLastHeight();
+            this.lastHeight = peerChainTipData.getHeight();
-            this.lastBlockSignature = peerChainTipData.getLastBlockSignature();
+            this.lastBlockSignature = peerChainTipData.getSignature();
-            this.lastBlockTimestamp = peerChainTipData.getLastBlockTimestamp();
+            this.lastBlockTimestamp = peerChainTipData.getTimestamp();
+        }
+
+        // Only include isTooDivergent decision if we've had the opportunity to request block summaries this peer
+        if (peer.getLastTooDivergentTime() != null) {
+            this.isTooDivergent = Controller.wasRecentlyTooDivergent.test(peer);
         }
     }
 

src/main/java/org/qortal/api/model/NodeStatus.java

@@ -4,6 +4,7 @@ import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 
 import org.qortal.controller.Controller;
+import org.qortal.controller.OnlineAccountsManager;
 import org.qortal.controller.Synchronizer;
 import org.qortal.network.Network;
 
@@ -21,7 +22,7 @@ public class NodeStatus {
 	public final int height;
 
 	public NodeStatus() {
-		this.isMintingPossible = Controller.getInstance().isMintingPossible();
+		this.isMintingPossible = OnlineAccountsManager.getInstance().hasActiveOnlineAccountSignatures();
 
 		this.syncPercent = Synchronizer.getInstance().getSyncPercent();
 		this.isSynchronizing = Synchronizer.getInstance().isSynchronizing();

src/main/java/org/qortal/api/model/crosschain/PirateChainSendRequest.java

@@ -0,0 +1,32 @@
+package org.qortal.api.model.crosschain;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
+
+@XmlAccessorType(XmlAccessType.FIELD)
+public class PirateChainSendRequest {
+
+	@Schema(description = "32 bytes of entropy, Base58 encoded", example = "5oSXF53qENtdUyKhqSxYzP57m6RhVFP9BJKRr9E5kRGV")
+	public String entropy58;
+
+	@Schema(description = "Recipient's Pirate Chain address", example = "zc...")
+	public String receivingAddress;
+
+	@Schema(description = "Amount of ARRR to send", type = "number")
+	@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
+	public long arrrAmount;
+
+	@Schema(description = "Transaction fee per byte (optional). Default is 0.00000100 ARRR (100 sats) per byte", example = "0.00000100", type = "number")
+	@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
+	public Long feePerByte;
+
+	@Schema(description = "Optional memo to include information for the recipient", example = "zc...")
+	public String memo;
+
+	public PirateChainSendRequest() {
+	}
+
+}

src/main/java/org/qortal/api/resource/AddressesResource.java

@@ -14,6 +14,7 @@ import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
+import java.util.stream.Collectors;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.ws.rs.*;
@@ -27,6 +28,7 @@ import org.qortal.api.ApiErrors;
 import org.qortal.api.ApiException;
 import org.qortal.api.ApiExceptionFactory;
 import org.qortal.api.Security;
+import org.qortal.api.model.AccountPenaltyStats;
 import org.qortal.api.model.ApiOnlineAccount;
 import org.qortal.api.model.RewardShareKeyRequest;
 import org.qortal.asset.Asset;
@@ -34,6 +36,7 @@ import org.qortal.controller.LiteNode;
 import org.qortal.controller.OnlineAccountsManager;
 import org.qortal.crypto.Crypto;
 import org.qortal.data.account.AccountData;
+import org.qortal.data.account.AccountPenaltyData;
 import org.qortal.data.account.RewardShareData;
 import org.qortal.data.network.OnlineAccountData;
 import org.qortal.data.network.OnlineAccountLevel;
@@ -205,6 +208,10 @@ public class AddressesResource {
 		try (final Repository repository = RepositoryManager.getRepository()) {
 			List<OnlineAccountLevel> onlineAccountLevels = new ArrayList<>();
 
+			// Prepopulate all levels
+			for (int i=0; i<=10; i++)
+				onlineAccountLevels.add(new OnlineAccountLevel(i, 0));
+
 			for (OnlineAccountData onlineAccountData : onlineAccounts) {
 				try {
 					final int minterLevel = Account.getRewardShareEffectiveMintingLevelIncludingLevelZero(repository, onlineAccountData.getPublicKey());
@@ -467,6 +474,54 @@ public class AddressesResource {
 		}
 	}
 
+	@GET
+	@Path("/penalties")
+	@Operation(
+			summary = "Get addresses with penalties",
+			description = "Returns a list of accounts with a blocksMintedPenalty",
+			responses = {
+					@ApiResponse(
+							description = "accounts with penalties",
+							content = @Content(mediaType = MediaType.APPLICATION_JSON, array = @ArraySchema(schema = @Schema(implementation = AccountPenaltyData.class)))
+					)
+			}
+	)
+	@ApiErrors({ApiError.INVALID_ADDRESS, ApiError.REPOSITORY_ISSUE})
+	public List<AccountPenaltyData> getAccountsWithPenalties() {
+		try (final Repository repository = RepositoryManager.getRepository()) {
+
+			List<AccountData> accounts = repository.getAccountRepository().getPenaltyAccounts();
+			List<AccountPenaltyData> penalties = accounts.stream().map(a -> new AccountPenaltyData(a.getAddress(), a.getBlocksMintedPenalty())).collect(Collectors.toList());
+
+			return penalties;
+		} catch (DataException e) {
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.REPOSITORY_ISSUE, e);
+		}
+	}
+
+	@GET
+	@Path("/penalties/stats")
+	@Operation(
+			summary = "Get stats about current penalties",
+			responses = {
+					@ApiResponse(
+							description = "aggregated stats about accounts with penalties",
+							content = @Content(mediaType = MediaType.APPLICATION_JSON, array = @ArraySchema(schema = @Schema(implementation = AccountPenaltyStats.class)))
+					)
+			}
+	)
+	@ApiErrors({ApiError.INVALID_ADDRESS, ApiError.REPOSITORY_ISSUE})
+	public AccountPenaltyStats getPenaltyStats() {
+		try (final Repository repository = RepositoryManager.getRepository()) {
+
+			List<AccountData> accounts = repository.getAccountRepository().getPenaltyAccounts();
+			return AccountPenaltyStats.fromAccounts(accounts);
+
+		} catch (DataException e) {
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.REPOSITORY_ISSUE, e);
+		}
+	}
+
 	@POST
 	@Path("/publicize")
 	@Operation(

src/main/java/org/qortal/api/resource/AdminResource.java

@@ -125,12 +125,12 @@ public class AdminResource {
 	}
 
 	private String getNodeType() {
-		if (Settings.getInstance().isTopOnly()) {
+		if (Settings.getInstance().isLite()) {
-			return "topOnly";
-		}
-		else if (Settings.getInstance().isLite()) {
 			return "lite";
 		}
+		else if (Settings.getInstance().isTopOnly()) {
+			return "topOnly";
+		}
 		else {
 			return "full";
 		}
@@ -728,6 +728,49 @@ public class AdminResource {
 		}
 	}
 
+	@POST
+	@Path("/repository/importarchivedtrades")
+	@Operation(
+			summary = "Imports archived trades from TradeBotStatesArchive.json",
+			description = "This can be used to recover trades that exist in the archive only, which may be needed if a<br />" +
+					"problem occurred during the proof-of-work computation stage of a buy request.",
+			responses = {
+					@ApiResponse(
+							content = @Content(mediaType = MediaType.TEXT_PLAIN, schema = @Schema(type = "boolean"))
+					)
+			}
+	)
+	@ApiErrors({ApiError.REPOSITORY_ISSUE})
+	@SecurityRequirement(name = "apiKey")
+	public boolean importArchivedTrades(@HeaderParam(Security.API_KEY_HEADER) String apiKey) {
+		Security.checkApiCallAllowed(request);
+
+		try (final Repository repository = RepositoryManager.getRepository()) {
+			ReentrantLock blockchainLock = Controller.getInstance().getBlockchainLock();
+
+			blockchainLock.lockInterruptibly();
+
+			try {
+				repository.importDataFromFile("qortal-backup/TradeBotStatesArchive.json");
+				repository.saveChanges();
+
+				return true;
+
+			} catch (IOException e) {
+				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA, e);
+
+			} finally {
+				blockchainLock.unlock();
+			}
+		} catch (InterruptedException e) {
+			// We couldn't lock blockchain to perform import
+			return false;
+		} catch (DataException e) {
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.REPOSITORY_ISSUE, e);
+		}
+	}
+
+
 
 	@POST
 	@Path("/apikey/generate")

src/main/java/org/qortal/api/resource/ArbitraryResource.java

@@ -12,10 +12,10 @@ import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
 import java.io.*;
-import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 import javax.servlet.ServletContext;
@@ -45,6 +45,7 @@ import org.qortal.data.arbitrary.*;
 import org.qortal.data.naming.NameData;
 import org.qortal.data.transaction.ArbitraryTransactionData;
 import org.qortal.data.transaction.TransactionData;
+import org.qortal.list.ResourceListManager;
 import org.qortal.repository.DataException;
 import org.qortal.repository.Repository;
 import org.qortal.repository.RepositoryManager;
@@ -56,6 +57,7 @@ import org.qortal.transaction.Transaction.ValidationResult;
 import org.qortal.transform.TransformationException;
 import org.qortal.transform.transaction.ArbitraryTransactionTransformer;
 import org.qortal.transform.transaction.TransactionTransformer;
+import org.qortal.utils.ArbitraryTransactionUtils;
 import org.qortal.utils.Base58;
 import org.qortal.utils.NTP;
 import org.qortal.utils.ZipUtils;
@@ -91,6 +93,7 @@ public class ArbitraryResource {
 			@Parameter(ref = "limit") @QueryParam("limit") Integer limit,
 			@Parameter(ref = "offset") @QueryParam("offset") Integer offset,
 			@Parameter(ref = "reverse") @QueryParam("reverse") Boolean reverse,
+			@Parameter(description = "Filter names by list") @QueryParam("namefilter") String nameFilter,
 			@Parameter(description = "Include status") @QueryParam("includestatus") Boolean includeStatus,
 			@Parameter(description = "Include metadata") @QueryParam("includemetadata") Boolean includeMetadata) {
 
@@ -107,8 +110,18 @@ public class ArbitraryResource {
 				throw ApiExceptionFactory.INSTANCE.createCustomException(request, ApiError.INVALID_CRITERIA, "identifier cannot be specified when requesting a default resource");
 			}
 
+			// Load filter from list if needed
+			List<String> names = null;
+			if (nameFilter != null) {
+				names = ResourceListManager.getInstance().getStringsInList(nameFilter);
+				if (names.isEmpty()) {
+					// List doesn't exist or is empty - so there will be no matches
+					return new ArrayList<>();
+				}
+			}
+
 			List<ArbitraryResourceInfo> resources = repository.getArbitraryRepository()
-					.getArbitraryResources(service, identifier, null, defaultRes, limit, offset, reverse);
+					.getArbitraryResources(service, identifier, names, defaultRes, limit, offset, reverse);
 
 			if (resources == null) {
 				return new ArrayList<>();
@@ -216,7 +229,7 @@ public class ArbitraryResource {
 				String name = creatorName.name;
 				if (name != null) {
 					List<ArbitraryResourceInfo> resources = repository.getArbitraryRepository()
-							.getArbitraryResources(service, identifier, name, defaultRes, null, null, reverse);
+							.getArbitraryResources(service, identifier, Arrays.asList(name), defaultRes, null, null, reverse);
 
 					if (includeStatus != null && includeStatus) {
 						resources = this.addStatusToResources(resources);
@@ -254,7 +267,7 @@ public class ArbitraryResource {
 															@QueryParam("build") Boolean build) {
 
 		Security.requirePriorAuthorizationOrApiKey(request, name, service, null);
-		return this.getStatus(service, name, null, build);
+		return ArbitraryTransactionUtils.getStatus(service, name, null, build);
 	}
 
 	@GET
@@ -276,7 +289,7 @@ public class ArbitraryResource {
 													 @QueryParam("build") Boolean build) {
 
 		Security.requirePriorAuthorizationOrApiKey(request, name, service, identifier);
-		return this.getStatus(service, name, identifier, build);
+		return ArbitraryTransactionUtils.getStatus(service, name, identifier, build);
 	}
 
 
@@ -706,7 +719,7 @@ public class ArbitraryResource {
 		try {
 			ArbitraryDataTransactionMetadata transactionMetadata = ArbitraryMetadataManager.getInstance().fetchMetadata(resource, false);
 			if (transactionMetadata != null) {
-				ArbitraryResourceMetadata resourceMetadata = ArbitraryResourceMetadata.fromTransactionMetadata(transactionMetadata);
+				ArbitraryResourceMetadata resourceMetadata = ArbitraryResourceMetadata.fromTransactionMetadata(transactionMetadata, true);
 				if (resourceMetadata != null) {
 					return resourceMetadata;
 				}
@@ -1115,7 +1128,7 @@ public class ArbitraryResource {
 			if (path == null) {
 				// See if we have a string instead
 				if (string != null) {
-					File tempFile = File.createTempFile("qortal-", ".tmp");
+					File tempFile = File.createTempFile("qortal-", "");
 					tempFile.deleteOnExit();
 					BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile.toPath().toString()));
 					writer.write(string);
@@ -1125,7 +1138,7 @@ public class ArbitraryResource {
 				}
 				// ... or base64 encoded raw data
 				else if (base64 != null) {
-					File tempFile = File.createTempFile("qortal-", ".tmp");
+					File tempFile = File.createTempFile("qortal-", "");
 					tempFile.deleteOnExit();
 					Files.write(tempFile.toPath(), Base64.decode(base64));
 					path = tempFile.toPath().toString();
@@ -1247,24 +1260,6 @@ public class ArbitraryResource {
 	}
 
 
-	private ArbitraryResourceStatus getStatus(Service service, String name, String identifier, Boolean build) {
-
-		// If "build=true" has been specified in the query string, build the resource before returning its status
-		if (build != null && build == true) {
-			ArbitraryDataReader reader = new ArbitraryDataReader(name, ArbitraryDataFile.ResourceIdType.NAME, service, null);
-			try {
-				if (!reader.isBuilding()) {
-					reader.loadSynchronously(false);
-				}
-			} catch (Exception e) {
-				// No need to handle exception, as it will be reflected in the status
-			}
-		}
-
-		ArbitraryDataResource resource = new ArbitraryDataResource(name, ResourceIdType.NAME, service, identifier);
-		return resource.getStatus(false);
-	}
-
 	private List<ArbitraryResourceInfo> addStatusToResources(List<ArbitraryResourceInfo> resources) {
 		// Determine and add the status of each resource
 		List<ArbitraryResourceInfo> updatedResources = new ArrayList<>();
@@ -1293,7 +1288,7 @@ public class ArbitraryResource {
 			ArbitraryDataResource resource = new ArbitraryDataResource(resourceInfo.name, ResourceIdType.NAME,
 					resourceInfo.service, resourceInfo.identifier);
 			ArbitraryDataTransactionMetadata transactionMetadata = resource.getLatestTransactionMetadata();
-			ArbitraryResourceMetadata resourceMetadata = ArbitraryResourceMetadata.fromTransactionMetadata(transactionMetadata);
+			ArbitraryResourceMetadata resourceMetadata = ArbitraryResourceMetadata.fromTransactionMetadata(transactionMetadata, false);
 			if (resourceMetadata != null) {
 				resourceInfo.metadata = resourceMetadata;
 			}

src/main/java/org/qortal/api/resource/BlocksResource.java

@@ -114,7 +114,7 @@ public class BlocksResource {
 	@Path("/signature/{signature}/data")
 	@Operation(
 			summary = "Fetch serialized, base58 encoded block data using base58 signature",
-			description = "Returns serialized data for the block that matches the given signature",
+			description = "Returns serialized data for the block that matches the given signature, and an optional block serialization version",
 			responses = {
 					@ApiResponse(
 							description = "the block data",
@@ -125,7 +125,7 @@ public class BlocksResource {
 	@ApiErrors({
 			ApiError.INVALID_SIGNATURE, ApiError.BLOCK_UNKNOWN, ApiError.INVALID_DATA, ApiError.REPOSITORY_ISSUE
 	})
-	public String getSerializedBlockData(@PathParam("signature") String signature58) {
+	public String getSerializedBlockData(@PathParam("signature") String signature58, @QueryParam("version") Integer version) {
 		// Decode signature
 		byte[] signature;
 		try {
@@ -136,20 +136,41 @@ public class BlocksResource {
 
 		try (final Repository repository = RepositoryManager.getRepository()) {
 
+			// Default to version 1
+			if (version == null) {
+				version = 1;
+			}
+
             // Check the database first
 			BlockData blockData = repository.getBlockRepository().fromSignature(signature);
 			if (blockData != null) {
                 Block block = new Block(repository, blockData);
                 ByteArrayOutputStream bytes = new ByteArrayOutputStream();
                 bytes.write(Ints.toByteArray(block.getBlockData().getHeight()));
-                bytes.write(BlockTransformer.toBytes(block));
+
+				switch (version) {
+					case 1:
+						bytes.write(BlockTransformer.toBytes(block));
+						break;
+
+					case 2:
+						bytes.write(BlockTransformer.toBytesV2(block));
+						break;
+
+					default:
+						throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
+				}
+
                 return Base58.encode(bytes.toByteArray());
             }
 
             // Not found, so try the block archive
             byte[] bytes = BlockArchiveReader.getInstance().fetchSerializedBlockBytesForSignature(signature, false, repository);
             if (bytes != null) {
-                return Base58.encode(bytes);
+				if (version != 1) {
+					throw ApiExceptionFactory.INSTANCE.createCustomException(request, ApiError.INVALID_CRITERIA, "Archived blocks require version 1");
+				}
+				return Base58.encode(bytes);
             }
 
             throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.BLOCK_UNKNOWN);
@@ -613,13 +634,16 @@ public class BlocksResource {
 	@ApiErrors({
 		ApiError.REPOSITORY_ISSUE
 	})
-	public List<BlockData> getBlockRange(@PathParam("height") int height, @Parameter(
+	public List<BlockData> getBlockRange(@PathParam("height") int height,
-		ref = "count"
+										 @Parameter(ref = "count") @QueryParam("count") int count,
-	) @QueryParam("count") int count) {
+										 @Parameter(ref = "reverse") @QueryParam("reverse") Boolean reverse,
+										 @QueryParam("includeOnlineSignatures") Boolean includeOnlineSignatures) {
 		try (final Repository repository = RepositoryManager.getRepository()) {
 			List<BlockData> blocks = new ArrayList<>();
+			boolean shouldReverse = (reverse != null && reverse == true);
 
-			for (/* count already set */; count > 0; --count, ++height) {
+			int i = 0;
+			while (i < count) {
 				BlockData blockData = repository.getBlockRepository().fromHeight(height);
 				if (blockData == null) {
 					// Not found - try the archive
@@ -629,8 +653,14 @@ public class BlocksResource {
 						break;
 					}
 				}
+				if (includeOnlineSignatures == null || includeOnlineSignatures == false) {
+					blockData.setOnlineAccountsSignatures(null);
+				}
 
 				blocks.add(blockData);
+
+				height = shouldReverse ? height - 1 : height + 1;
+				i++;
 			}
 
 			return blocks;

src/main/java/org/qortal/api/resource/ChatResource.java

@@ -69,6 +69,9 @@ public class ChatResource {
 	public List<ChatMessage> searchChat(@QueryParam("before") Long before, @QueryParam("after") Long after,
 			@QueryParam("txGroupId") Integer txGroupId,
 			@QueryParam("involving") List<String> involvingAddresses,
+			@QueryParam("reference") String reference,
+			@QueryParam("chatreference") String chatReference,
+			@QueryParam("haschatreference") Boolean hasChatReference,
 			@Parameter(ref = "limit") @QueryParam("limit") Integer limit,
 			@Parameter(ref = "offset") @QueryParam("offset") Integer offset,
 			@Parameter(ref = "reverse") @QueryParam("reverse") Boolean reverse) {
@@ -87,11 +90,22 @@ public class ChatResource {
 		if (after != null && after < 1500000000000L)
 			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
 
+		byte[] referenceBytes = null;
+		if (reference != null)
+			referenceBytes = Base58.decode(reference);
+
+		byte[] chatReferenceBytes = null;
+		if (chatReference != null)
+			chatReferenceBytes = Base58.decode(chatReference);
+
 		try (final Repository repository = RepositoryManager.getRepository()) {
 			return repository.getChatRepository().getMessagesMatchingCriteria(
 					before,
 					after,
 					txGroupId,
+					referenceBytes,
+					chatReferenceBytes,
+					hasChatReference,
 					involvingAddresses,
 					limit, offset, reverse);
 		} catch (DataException e) {
@@ -99,6 +113,38 @@ public class ChatResource {
 		}
 	}
 
+	@GET
+	@Path("/message/{signature}")
+	@Operation(
+			summary = "Find chat message by signature",
+			responses = {
+					@ApiResponse(
+							description = "CHAT message",
+							content = @Content(
+										schema = @Schema(
+												implementation = ChatMessage.class
+										)
+							)
+					)
+			}
+	)
+	@ApiErrors({ApiError.INVALID_CRITERIA, ApiError.INVALID_ADDRESS, ApiError.REPOSITORY_ISSUE})
+	public ChatMessage getMessageBySignature(@PathParam("signature") String signature58) {
+		byte[] signature = Base58.decode(signature58);
+
+		try (final Repository repository = RepositoryManager.getRepository()) {
+
+			ChatTransactionData chatTransactionData = (ChatTransactionData) repository.getTransactionRepository().fromSignature(signature);
+			if (chatTransactionData == null) {
+				throw ApiExceptionFactory.INSTANCE.createCustomException(request, ApiError.INVALID_CRITERIA, "Message not found");
+			}
+
+			return repository.getChatRepository().toChatMessage(chatTransactionData);
+		} catch (DataException e) {
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.REPOSITORY_ISSUE, e);
+		}
+	}
+
 	@GET
 	@Path("/active/{address}")
 	@Operation(

src/main/java/org/qortal/api/resource/CrossChainBitcoinResource.java

@@ -68,7 +68,7 @@ public class CrossChainBitcoinResource {
 			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_PRIVATE_KEY);
 
 		try {
-			Long balance = bitcoin.getWalletBalanceFromTransactions(key58);
+			Long balance = bitcoin.getWalletBalance(key58);
 			if (balance == null)
 				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE);
 

src/main/java/org/qortal/api/resource/CrossChainDigibyteResource.java

@@ -68,7 +68,7 @@ public class CrossChainDigibyteResource {
 			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_PRIVATE_KEY);
 
 		try {
-			Long balance = digibyte.getWalletBalanceFromTransactions(key58);
+			Long balance = digibyte.getWalletBalance(key58);
 			if (balance == null)
 				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE);
 

src/main/java/org/qortal/api/resource/CrossChainDogecoinResource.java

@@ -66,7 +66,7 @@ public class CrossChainDogecoinResource {
 			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_PRIVATE_KEY);
 
 		try {
-			Long balance = dogecoin.getWalletBalanceFromTransactions(key58);
+			Long balance = dogecoin.getWalletBalance(key58);
 			if (balance == null)
 				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE);
 

src/main/java/org/qortal/api/resource/CrossChainHtlcResource.java

@@ -1,5 +1,6 @@
 package org.qortal.api.resource;
 
+import com.google.common.hash.HashCode;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.media.Content;
 import io.swagger.v3.oas.annotations.media.Schema;
@@ -9,6 +10,8 @@ import io.swagger.v3.oas.annotations.tags.Tag;
 
 import java.math.BigDecimal;
 import java.util.List;
+import java.util.Objects;
+import java.util.stream.Collectors;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.ws.rs.*;
@@ -284,6 +287,12 @@ public class CrossChainHtlcResource {
 					continue;
 				}
 
+				Bitcoiny bitcoiny = (Bitcoiny) acct.getBlockchain();
+				if (Objects.equals(bitcoiny.getCurrencyCode(), "ARRR")) {
+					LOGGER.info("Skipping AT {} because ARRR is currently unsupported", atAddress);
+					continue;
+				}
+
 				CrossChainTradeData crossChainTradeData = acct.populateTradeData(repository, atData);
 				if (crossChainTradeData == null) {
 					LOGGER.info("Couldn't find crosschain trade data for AT {}", atAddress);
@@ -363,10 +372,6 @@ public class CrossChainHtlcResource {
 			// Use secret-A to redeem P2SH-A
 
 			Bitcoiny bitcoiny = (Bitcoiny) acct.getBlockchain();
-			if (bitcoiny.getClass() == Bitcoin.class) {
-				LOGGER.info("Redeeming a Bitcoin HTLC is not yet supported");
-				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
-			}
 
 			int lockTime = crossChainTradeData.lockTimeA;
 			byte[] redeemScriptA = BitcoinyHTLC.buildScript(crossChainTradeData.partnerForeignPKH, lockTime, crossChainTradeData.creatorForeignPKH, crossChainTradeData.hashOfSecretA);
@@ -574,70 +579,108 @@ public class CrossChainHtlcResource {
 			// If the AT is "finished" then it will have a zero balance
 			// In these cases we should avoid HTLC refunds if tbe QORT haven't been returned to the seller
 			if (atData.getIsFinished() && crossChainTradeData.mode != AcctMode.REFUNDED && crossChainTradeData.mode != AcctMode.CANCELLED) {
-				LOGGER.info(String.format("Skipping AT %s because the QORT has already been redemed", atAddress));
+				LOGGER.info(String.format("Skipping AT %s because the QORT has already been redeemed by the buyer", atAddress));
 				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
 			}
 
 			List<TradeBotData> allTradeBotData = repository.getCrossChainRepository().getAllTradeBotData();
-			TradeBotData tradeBotData = allTradeBotData.stream().filter(tradeBotDataItem -> tradeBotDataItem.getAtAddress().equals(atAddress)).findFirst().orElse(null);
+			List<TradeBotData> tradeBotDataList = allTradeBotData.stream().filter(tradeBotDataItem -> tradeBotDataItem.getAtAddress().equals(atAddress)).collect(Collectors.toList());
-			if (tradeBotData == null)
+			if (tradeBotDataList == null || tradeBotDataList.isEmpty())
 				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
 
-			Bitcoiny bitcoiny = (Bitcoiny) acct.getBlockchain();
+			// Loop through all matching entries for this AT address, as there might be more than one
-			if (bitcoiny.getClass() == Bitcoin.class) {
+			for (TradeBotData tradeBotData : tradeBotDataList) {
-				LOGGER.info("Refunding a Bitcoin HTLC is not yet supported");
-				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
-			}
 
-			int lockTime = tradeBotData.getLockTimeA();
+				if (tradeBotData == null)
+					throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
 
-			// We can't refund P2SH-A until lockTime-A has passed
+				Bitcoiny bitcoiny = (Bitcoiny) acct.getBlockchain();
-			if (NTP.getTime() <= lockTime * 1000L)
+				int lockTime = tradeBotData.getLockTimeA();
-				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_TOO_SOON);
 
-			// We can't refund P2SH-A until median block time has passed lockTime-A (see BIP113)
+				// We can't refund P2SH-A until lockTime-A has passed
-			int medianBlockTime = bitcoiny.getMedianBlockTime();
+				if (NTP.getTime() <= lockTime * 1000L)
-			if (medianBlockTime <= lockTime)
+					continue;
-				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_TOO_SOON);
 
-			byte[] redeemScriptA = BitcoinyHTLC.buildScript(tradeBotData.getTradeForeignPublicKeyHash(), lockTime, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
+				// We can't refund P2SH-A until median block time has passed lockTime-A (see BIP113)
-			String p2shAddressA = bitcoiny.deriveP2shAddress(redeemScriptA);
+				int medianBlockTime = bitcoiny.getMedianBlockTime();
-			LOGGER.info(String.format("Refunding P2SH address: %s", p2shAddressA));
+				if (medianBlockTime <= lockTime)
+					continue;
 
-			// Fee for redeem/refund is subtracted from P2SH-A balance.
+				// Fee for redeem/refund is subtracted from P2SH-A balance.
-			long feeTimestamp = calcFeeTimestamp(lockTime, crossChainTradeData.tradeTimeout);
+				long feeTimestamp = calcFeeTimestamp(lockTime, crossChainTradeData.tradeTimeout);
-			long p2shFee = bitcoiny.getP2shFee(feeTimestamp);
+				long p2shFee = bitcoiny.getP2shFee(feeTimestamp);
-			long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
+				long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
-			BitcoinyHTLC.Status htlcStatusA = BitcoinyHTLC.determineHtlcStatus(bitcoiny.getBlockchainProvider(), p2shAddressA, minimumAmountA);
 
-			switch (htlcStatusA) {
+				// Create redeem script based on destination chain
-				case UNFUNDED:
+				byte[] redeemScriptA;
-				case FUNDING_IN_PROGRESS:
+				String p2shAddressA;
-					// Still waiting for P2SH-A to be funded...
+				BitcoinyHTLC.Status htlcStatusA;
-					throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_TOO_SOON);
+				if (Objects.equals(bitcoiny.getCurrencyCode(), "ARRR")) {
+					redeemScriptA = PirateChainHTLC.buildScript(tradeBotData.getTradeForeignPublicKey(), lockTime, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
+					p2shAddressA = PirateChain.getInstance().deriveP2shAddressBPrefix(redeemScriptA);
+					htlcStatusA = PirateChainHTLC.determineHtlcStatus(bitcoiny.getBlockchainProvider(), p2shAddressA, minimumAmountA);
+				} else {
+					redeemScriptA = BitcoinyHTLC.buildScript(tradeBotData.getTradeForeignPublicKeyHash(), lockTime, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
+					p2shAddressA = bitcoiny.deriveP2shAddress(redeemScriptA);
+					htlcStatusA = BitcoinyHTLC.determineHtlcStatus(bitcoiny.getBlockchainProvider(), p2shAddressA, minimumAmountA);
+				}
+				LOGGER.info(String.format("Refunding P2SH address: %s", p2shAddressA));
 
-				case REDEEM_IN_PROGRESS:
+				switch (htlcStatusA) {
-				case REDEEMED:
+					case UNFUNDED:
-				case REFUND_IN_PROGRESS:
+					case FUNDING_IN_PROGRESS:
-				case REFUNDED:
+						// Still waiting for P2SH-A to be funded...
-					// Too late!
+						continue;
-					return false;
 
-				case FUNDED:{
+					case REDEEM_IN_PROGRESS:
-					Coin refundAmount = Coin.valueOf(crossChainTradeData.expectedForeignAmount);
+					case REDEEMED:
-					ECKey refundKey = ECKey.fromPrivate(tradeBotData.getTradePrivateKey());
+					case REFUND_IN_PROGRESS:
-					List<TransactionOutput> fundingOutputs = bitcoiny.getUnspentOutputs(p2shAddressA);
+					case REFUNDED:
+						// Too late!
+						continue;
 
-					// Validate the destination foreign blockchain address
+					case FUNDED: {
-					Address receiving = Address.fromString(bitcoiny.getNetworkParameters(), receiveAddress);
+						Coin refundAmount = Coin.valueOf(crossChainTradeData.expectedForeignAmount);
-					if (receiving.getOutputScriptType() != Script.ScriptType.P2PKH)
-						throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
 
-					Transaction p2shRefundTransaction = BitcoinyHTLC.buildRefundTransaction(bitcoiny.getNetworkParameters(), refundAmount, refundKey,
+						if (Objects.equals(bitcoiny.getCurrencyCode(), "ARRR")) {
-							fundingOutputs, redeemScriptA, lockTime, receiving.getHash());
+							// Pirate Chain custom integration
 
-					bitcoiny.broadcastTransaction(p2shRefundTransaction);
+							PirateChain pirateChain = PirateChain.getInstance();
-					return true;
+							String p2shAddressT3 = pirateChain.deriveP2shAddress(redeemScriptA);
+
+							// Get funding txid
+							String fundingTxidHex = PirateChainHTLC.getUnspentFundingTxid(pirateChain.getBlockchainProvider(), p2shAddressA, minimumAmountA);
+							if (fundingTxidHex == null) {
+								throw new ForeignBlockchainException("Missing funding txid when refunding P2SH");
+							}
+							String fundingTxid58 = Base58.encode(HashCode.fromString(fundingTxidHex).asBytes());
+
+							byte[] privateKey = tradeBotData.getTradePrivateKey();
+							String privateKey58 = Base58.encode(privateKey);
+							String redeemScript58 = Base58.encode(redeemScriptA);
+
+							String txid = PirateChain.getInstance().refundP2sh(p2shAddressT3,
+									receiveAddress, refundAmount.value, redeemScript58, fundingTxid58, lockTime, privateKey58);
+							LOGGER.info("Refund txid: {}", txid);
+						} else {
+							// ElectrumX coins
+
+							ECKey refundKey = ECKey.fromPrivate(tradeBotData.getTradePrivateKey());
+							List<TransactionOutput> fundingOutputs = bitcoiny.getUnspentOutputs(p2shAddressA);
+
+							// Validate the destination foreign blockchain address
+							Address receiving = Address.fromString(bitcoiny.getNetworkParameters(), receiveAddress);
+							if (receiving.getOutputScriptType() != Script.ScriptType.P2PKH)
+								throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
+
+							Transaction p2shRefundTransaction = BitcoinyHTLC.buildRefundTransaction(bitcoiny.getNetworkParameters(), refundAmount, refundKey,
+									fundingOutputs, redeemScriptA, lockTime, receiving.getHash());
+
+							bitcoiny.broadcastTransaction(p2shRefundTransaction);
+						}
+
+						return true;
+					}
 				}
 			}
 

src/main/java/org/qortal/api/resource/CrossChainLitecoinResource.java

@@ -68,7 +68,7 @@ public class CrossChainLitecoinResource {
 			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_PRIVATE_KEY);
 
 		try {
-			Long balance = litecoin.getWalletBalanceFromTransactions(key58);
+			Long balance = litecoin.getWalletBalance(key58);
 			if (balance == null)
 				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE);
 

src/main/java/org/qortal/api/resource/CrossChainPirateChainResource.java

@@ -0,0 +1,229 @@
+package org.qortal.api.resource;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.media.ArraySchema;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Schema;
+import io.swagger.v3.oas.annotations.parameters.RequestBody;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import org.qortal.api.ApiError;
+import org.qortal.api.ApiErrors;
+import org.qortal.api.ApiExceptionFactory;
+import org.qortal.api.Security;
+import org.qortal.api.model.crosschain.PirateChainSendRequest;
+import org.qortal.crosschain.ForeignBlockchainException;
+import org.qortal.crosschain.PirateChain;
+import org.qortal.crosschain.SimpleTransaction;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.ws.rs.HeaderParam;
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import javax.ws.rs.core.Context;
+import javax.ws.rs.core.MediaType;
+import java.util.List;
+
+@Path("/crosschain/arrr")
+@Tag(name = "Cross-Chain (Pirate Chain)")
+public class CrossChainPirateChainResource {
+
+	@Context
+	HttpServletRequest request;
+
+	@POST
+	@Path("/walletbalance")
+	@Operation(
+		summary = "Returns ARRR balance",
+		description = "Supply 32 bytes of entropy, Base58 encoded",
+		requestBody = @RequestBody(
+			required = true,
+			content = @Content(
+				mediaType = MediaType.TEXT_PLAIN,
+				schema = @Schema(
+						type = "string",
+						description = "32 bytes of entropy, Base58 encoded",
+						example = "5oSXF53qENtdUyKhqSxYzP57m6RhVFP9BJKRr9E5kRGV"
+				)
+			)
+		),
+		responses = {
+			@ApiResponse(
+				content = @Content(mediaType = MediaType.TEXT_PLAIN, schema = @Schema(type = "string", description = "balance (satoshis)"))
+			)
+		}
+	)
+	@ApiErrors({ApiError.INVALID_PRIVATE_KEY, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE})
+	@SecurityRequirement(name = "apiKey")
+	public String getPirateChainWalletBalance(@HeaderParam(Security.API_KEY_HEADER) String apiKey, String entropy58) {
+		Security.checkApiCallAllowed(request);
+
+		PirateChain pirateChain = PirateChain.getInstance();
+
+		try {
+			Long balance = pirateChain.getWalletBalance(entropy58);
+			if (balance == null)
+				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE);
+
+			return balance.toString();
+
+		} catch (ForeignBlockchainException e) {
+			throw ApiExceptionFactory.INSTANCE.createCustomException(request, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE, e.getMessage());
+		}
+	}
+
+	@POST
+	@Path("/wallettransactions")
+	@Operation(
+		summary = "Returns transactions",
+		description = "Supply 32 bytes of entropy, Base58 encoded",
+		requestBody = @RequestBody(
+			required = true,
+			content = @Content(
+				mediaType = MediaType.TEXT_PLAIN,
+				schema = @Schema(
+						type = "string",
+						description = "32 bytes of entropy, Base58 encoded",
+						example = "5oSXF53qENtdUyKhqSxYzP57m6RhVFP9BJKRr9E5kRGV"
+				)
+			)
+		),
+		responses = {
+			@ApiResponse(
+				content = @Content(array = @ArraySchema( schema = @Schema( implementation = SimpleTransaction.class ) ) )
+			)
+		}
+	)
+	@ApiErrors({ApiError.INVALID_PRIVATE_KEY, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE})
+	@SecurityRequirement(name = "apiKey")
+	public List<SimpleTransaction> getPirateChainWalletTransactions(@HeaderParam(Security.API_KEY_HEADER) String apiKey, String entropy58) {
+		Security.checkApiCallAllowed(request);
+
+		PirateChain pirateChain = PirateChain.getInstance();
+
+		try {
+			return pirateChain.getWalletTransactions(entropy58);
+		} catch (ForeignBlockchainException e) {
+			throw ApiExceptionFactory.INSTANCE.createCustomException(request, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE, e.getMessage());
+		}
+	}
+
+	@POST
+	@Path("/send")
+	@Operation(
+		summary = "Sends ARRR from wallet",
+		description = "Currently supports 'legacy' P2PKH PirateChain addresses and Native SegWit (P2WPKH) addresses. Supply BIP32 'm' private key in base58, starting with 'xprv' for mainnet, 'tprv' for testnet",
+		requestBody = @RequestBody(
+			required = true,
+			content = @Content(
+				mediaType = MediaType.TEXT_PLAIN,
+				schema = @Schema(
+						type = "string",
+						description = "32 bytes of entropy, Base58 encoded",
+						example = "5oSXF53qENtdUyKhqSxYzP57m6RhVFP9BJKRr9E5kRGV"
+				)
+			)
+		),
+		responses = {
+			@ApiResponse(
+				content = @Content(mediaType = MediaType.TEXT_PLAIN, schema = @Schema(type = "string", description = "transaction hash"))
+			)
+		}
+	)
+	@ApiErrors({ApiError.INVALID_PRIVATE_KEY, ApiError.INVALID_CRITERIA, ApiError.INVALID_ADDRESS, ApiError.FOREIGN_BLOCKCHAIN_BALANCE_ISSUE, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE})
+	@SecurityRequirement(name = "apiKey")
+	public String sendBitcoin(@HeaderParam(Security.API_KEY_HEADER) String apiKey, PirateChainSendRequest pirateChainSendRequest) {
+		Security.checkApiCallAllowed(request);
+
+		if (pirateChainSendRequest.arrrAmount <= 0)
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
+
+		if (pirateChainSendRequest.feePerByte != null && pirateChainSendRequest.feePerByte <= 0)
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
+
+		PirateChain pirateChain = PirateChain.getInstance();
+
+		try {
+			return pirateChain.sendCoins(pirateChainSendRequest);
+
+		} catch (ForeignBlockchainException e) {
+			// TODO
+			throw ApiExceptionFactory.INSTANCE.createCustomException(request, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE, e.getMessage());
+		}
+	}
+
+
+	@POST
+	@Path("/walletaddress")
+	@Operation(
+			summary = "Returns main wallet address",
+			description = "Supply 32 bytes of entropy, Base58 encoded",
+			requestBody = @RequestBody(
+					required = true,
+					content = @Content(
+							mediaType = MediaType.TEXT_PLAIN,
+							schema = @Schema(
+									type = "string",
+									description = "32 bytes of entropy, Base58 encoded",
+									example = "5oSXF53qENtdUyKhqSxYzP57m6RhVFP9BJKRr9E5kRGV"
+							)
+					)
+			),
+			responses = {
+					@ApiResponse(
+							content = @Content(array = @ArraySchema( schema = @Schema( implementation = SimpleTransaction.class ) ) )
+					)
+			}
+	)
+	@ApiErrors({ApiError.INVALID_PRIVATE_KEY, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE})
+	@SecurityRequirement(name = "apiKey")
+	public String getPirateChainWalletAddress(@HeaderParam(Security.API_KEY_HEADER) String apiKey, String entropy58) {
+		Security.checkApiCallAllowed(request);
+
+		PirateChain pirateChain = PirateChain.getInstance();
+
+		try {
+			return pirateChain.getWalletAddress(entropy58);
+		} catch (ForeignBlockchainException e) {
+			throw ApiExceptionFactory.INSTANCE.createCustomException(request, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE, e.getMessage());
+		}
+	}
+
+
+	@POST
+	@Path("/syncstatus")
+	@Operation(
+			summary = "Returns synchronization status",
+			description = "Supply 32 bytes of entropy, Base58 encoded",
+			requestBody = @RequestBody(
+					required = true,
+					content = @Content(
+							mediaType = MediaType.TEXT_PLAIN,
+							schema = @Schema(
+									type = "string",
+									description = "32 bytes of entropy, Base58 encoded",
+									example = "5oSXF53qENtdUyKhqSxYzP57m6RhVFP9BJKRr9E5kRGV"
+							)
+					)
+			),
+			responses = {
+					@ApiResponse(
+							content = @Content(array = @ArraySchema( schema = @Schema( implementation = SimpleTransaction.class ) ) )
+					)
+			}
+	)
+	@ApiErrors({ApiError.INVALID_PRIVATE_KEY, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE})
+	@SecurityRequirement(name = "apiKey")
+	public String getPirateChainSyncStatus(@HeaderParam(Security.API_KEY_HEADER) String apiKey, String entropy58) {
+		Security.checkApiCallAllowed(request);
+
+		PirateChain pirateChain = PirateChain.getInstance();
+
+		try {
+			return pirateChain.getSyncStatus(entropy58);
+		} catch (ForeignBlockchainException e) {
+			throw ApiExceptionFactory.INSTANCE.createCustomException(request, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE, e.getMessage());
+		}
+	}
+}

src/main/java/org/qortal/api/resource/CrossChainRavencoinResource.java

@@ -68,7 +68,7 @@ public class CrossChainRavencoinResource {
 			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_PRIVATE_KEY);
 
 		try {
-			Long balance = ravencoin.getWalletBalanceFromTransactions(key58);
+			Long balance = ravencoin.getWalletBalance(key58);
 			if (balance == null)
 				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.FOREIGN_BLOCKCHAIN_NETWORK_ISSUE);
 

src/main/java/org/qortal/api/resource/CrossChainTradeBotResource.java

@@ -11,6 +11,7 @@ import io.swagger.v3.oas.annotations.security.SecurityRequirement;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 import javax.servlet.http.HttpServletRequest;
@@ -38,9 +39,12 @@ import org.qortal.crypto.Crypto;
 import org.qortal.data.at.ATData;
 import org.qortal.data.crosschain.CrossChainTradeData;
 import org.qortal.data.crosschain.TradeBotData;
+import org.qortal.data.transaction.MessageTransactionData;
+import org.qortal.data.transaction.TransactionData;
 import org.qortal.repository.DataException;
 import org.qortal.repository.Repository;
 import org.qortal.repository.RepositoryManager;
+import org.qortal.transaction.Transaction;
 import org.qortal.utils.Base58;
 import org.qortal.utils.NTP;
 
@@ -155,7 +159,7 @@ public class CrossChainTradeBotResource {
 
 			return Base58.encode(unsignedBytes);
 		} catch (DataException e) {
-			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.REPOSITORY_ISSUE, e);
+			throw ApiExceptionFactory.INSTANCE.createCustomException(request, ApiError.REPOSITORY_ISSUE, e.getMessage());
 		}
 	}
 
@@ -223,6 +227,17 @@ public class CrossChainTradeBotResource {
 			if (crossChainTradeData.mode != AcctMode.OFFERING)
 				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
 
+			// Check if there is a buy or a cancel request in progress for this trade
+			List<Transaction.TransactionType> txTypes = List.of(Transaction.TransactionType.MESSAGE);
+			List<TransactionData> unconfirmed = repository.getTransactionRepository().getUnconfirmedTransactions(txTypes, null, 0, 0, false);
+			for (TransactionData  transactionData : unconfirmed) {
+				MessageTransactionData messageTransactionData = (MessageTransactionData) transactionData;
+				if (Objects.equals(messageTransactionData.getRecipient(), atAddress)) {
+					// There is a pending request for this trade, so block this buy attempt to reduce the risk of refunds
+					throw ApiExceptionFactory.INSTANCE.createCustomException(request, ApiError.INVALID_CRITERIA, "Trade has an existing buy request or is pending cancellation.");
+				}
+			}
+
 			AcctTradeBot.ResponseResult result = TradeBot.getInstance().startResponse(repository, atData, acct, crossChainTradeData,
 					tradeBotRespondRequest.foreignKey, tradeBotRespondRequest.receivingAddress);
 
@@ -240,7 +255,7 @@ public class CrossChainTradeBotResource {
 					return "false";
 			}
 		} catch (DataException e) {
-			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.REPOSITORY_ISSUE, e);
+			throw ApiExceptionFactory.INSTANCE.createCustomException(request, ApiError.REPOSITORY_ISSUE, e.getMessage());
 		}
 	}
 

src/main/java/org/qortal/api/resource/TransactionsResource.java

@@ -748,7 +748,7 @@ public class TransactionsResource {
 				throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_SIGNATURE);
 
 			ReentrantLock blockchainLock = Controller.getInstance().getBlockchainLock();
-			if (!blockchainLock.tryLock(30, TimeUnit.SECONDS))
+			if (!blockchainLock.tryLock(60, TimeUnit.SECONDS))
 				throw createTransactionInvalidException(request, ValidationResult.NO_BLOCKCHAIN_LOCK);
 
 			try {

src/main/java/org/qortal/api/websocket/ChatMessagesWebSocket.java

@@ -46,6 +46,9 @@ public class ChatMessagesWebSocket extends ApiWebSocket {
 						null,
 						txGroupId,
 						null,
+						null,
+						null,
+						null,
 						null, null, null);
 
 				sendMessages(session, chatMessages);
@@ -69,6 +72,9 @@ public class ChatMessagesWebSocket extends ApiWebSocket {
 
 		try (final Repository repository = RepositoryManager.getRepository()) {
 			List<ChatMessage> chatMessages = repository.getChatRepository().getMessagesMatchingCriteria(
+					null,
+					null,
+					null,
 					null,
 					null,
 					null,

src/main/java/org/qortal/api/websocket/TradeBotWebSocket.java

@@ -2,10 +2,7 @@ package org.qortal.api.websocket;
 
 import java.io.IOException;
 import java.io.StringWriter;
-import java.util.Collections;
+import java.util.*;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
 import java.util.stream.Collectors;
 
 import org.eclipse.jetty.websocket.api.Session;
@@ -85,6 +82,7 @@ public class TradeBotWebSocket extends ApiWebSocket implements Listener {
 	@Override
 	public void onWebSocketConnect(Session session) {
 		Map<String, List<String>> queryParams = session.getUpgradeRequest().getParameterMap();
+		final boolean excludeInitialData = queryParams.get("excludeInitialData") != null;
 
 		List<String> foreignBlockchains = queryParams.get("foreignBlockchain");
 		final String foreignBlockchain = foreignBlockchains == null ? null : foreignBlockchains.get(0);
@@ -98,15 +96,22 @@ public class TradeBotWebSocket extends ApiWebSocket implements Listener {
 		// save session's preferred blockchain (if any)
 		sessionBlockchain.put(session, foreignBlockchain);
 
-		// Send all known trade-bot entries
-		try (final Repository repository = RepositoryManager.getRepository()) {
-			List<TradeBotData> tradeBotEntries = repository.getCrossChainRepository().getAllTradeBotData();
 
-			// Optional filtering
+
-			if (foreignBlockchain != null)
+		// Maybe send all known trade-bot entries
-				tradeBotEntries = tradeBotEntries.stream()
+		try (final Repository repository = RepositoryManager.getRepository()) {
-						.filter(tradeBotData -> tradeBotData.getForeignBlockchain().equals(foreignBlockchain))
+			List<TradeBotData> tradeBotEntries = new ArrayList<>();
-						.collect(Collectors.toList());
+
+			// We might need to exclude the initial data from the response
+			if (!excludeInitialData) {
+				tradeBotEntries = repository.getCrossChainRepository().getAllTradeBotData();
+
+				// Optional filtering
+				if (foreignBlockchain != null)
+					tradeBotEntries = tradeBotEntries.stream()
+							.filter(tradeBotData -> tradeBotData.getForeignBlockchain().equals(foreignBlockchain))
+							.collect(Collectors.toList());
+			}
 
 			if (!sendEntries(session, tradeBotEntries)) {
 				session.close(4002, "websocket issue");

src/main/java/org/qortal/api/websocket/TradeOffersWebSocket.java

@@ -173,6 +173,7 @@ public class TradeOffersWebSocket extends ApiWebSocket implements Listener {
 	public void onWebSocketConnect(Session session) {
 		Map<String, List<String>> queryParams = session.getUpgradeRequest().getParameterMap();
 		final boolean includeHistoric = queryParams.get("includeHistoric") != null;
+		final boolean excludeInitialData = queryParams.get("excludeInitialData") != null;
 
 		List<String> foreignBlockchains = queryParams.get("foreignBlockchain");
 		final String foreignBlockchain = foreignBlockchains == null ? null : foreignBlockchains.get(0);
@@ -189,20 +190,23 @@ public class TradeOffersWebSocket extends ApiWebSocket implements Listener {
 
 		List<CrossChainOfferSummary> crossChainOfferSummaries = new ArrayList<>();
 
-		synchronized (cachedInfoByBlockchain) {
+		// We might need to exclude the initial data from the response
-			Collection<CachedOfferInfo> cachedInfos;
+		if (!excludeInitialData) {
+			synchronized (cachedInfoByBlockchain) {
+				Collection<CachedOfferInfo> cachedInfos;
 
-			if (foreignBlockchain == null)
+				if (foreignBlockchain == null)
-				// No preferred blockchain, so iterate through all of them
+					// No preferred blockchain, so iterate through all of them
-				cachedInfos = cachedInfoByBlockchain.values();
+					cachedInfos = cachedInfoByBlockchain.values();
-			else
+				else
-				cachedInfos = Collections.singleton(cachedInfoByBlockchain.computeIfAbsent(foreignBlockchain, k -> new CachedOfferInfo()));
+					cachedInfos = Collections.singleton(cachedInfoByBlockchain.computeIfAbsent(foreignBlockchain, k -> new CachedOfferInfo()));
 
-			for (CachedOfferInfo cachedInfo : cachedInfos) {
+				for (CachedOfferInfo cachedInfo : cachedInfos) {
-				crossChainOfferSummaries.addAll(cachedInfo.currentSummaries.values());
+					crossChainOfferSummaries.addAll(cachedInfo.currentSummaries.values());
 
-				if (includeHistoric)
+					if (includeHistoric)
-					crossChainOfferSummaries.addAll(cachedInfo.historicSummaries.values());
+						crossChainOfferSummaries.addAll(cachedInfo.historicSummaries.values());
+				}
 			}
 		}
 

src/main/java/org/qortal/api/websocket/TradePresenceWebSocket.java

@@ -65,11 +65,15 @@ public class TradePresenceWebSocket extends ApiWebSocket implements Listener {
 	@Override
 	public void onWebSocketConnect(Session session) {
 		Map<String, List<String>> queryParams = session.getUpgradeRequest().getParameterMap();
+		final boolean excludeInitialData = queryParams.get("excludeInitialData") != null;
 
-		List<TradePresenceData> tradePresences;
+		List<TradePresenceData> tradePresences = new ArrayList<>();
 
-		synchronized (currentEntries) {
+		// We might need to exclude the initial data from the response
-			tradePresences = List.copyOf(currentEntries.values());
+		if (!excludeInitialData) {
+			synchronized (currentEntries) {
+				tradePresences = List.copyOf(currentEntries.values());
+			}
 		}
 
 		if (!sendTradePresences(session, tradePresences)) {

src/main/java/org/qortal/arbitrary/ArbitraryDataBuilder.java

@@ -2,6 +2,7 @@ package org.qortal.arbitrary;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.qortal.arbitrary.exception.DataNotPublishedException;
 import org.qortal.arbitrary.exception.MissingDataException;
 import org.qortal.arbitrary.metadata.ArbitraryDataMetadataCache;
 import org.qortal.arbitrary.misc.Service;
@@ -88,7 +89,7 @@ public class ArbitraryDataBuilder {
             if (latestPut == null) {
                 String message = String.format("Couldn't find PUT transaction for name %s, service %s and identifier %s",
                         this.name, this.service, this.identifierString());
-                throw new DataException(message);
+                throw new DataNotPublishedException(message);
             }
             this.latestPutTransaction = latestPut;
 

src/main/java/org/qortal/arbitrary/ArbitraryDataReader.java

@@ -4,6 +4,7 @@ import org.apache.commons.io.FileUtils;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+import org.qortal.arbitrary.exception.DataNotPublishedException;
 import org.qortal.arbitrary.exception.MissingDataException;
 import org.qortal.arbitrary.misc.Service;
 import org.qortal.controller.arbitrary.ArbitraryDataBuildManager;
@@ -59,6 +60,9 @@ public class ArbitraryDataReader {
     private int layerCount;
     private byte[] latestSignature;
 
+    // The resource being read
+    ArbitraryDataResource arbitraryDataResource = null;
+
     public ArbitraryDataReader(String resourceId, ResourceIdType resourceIdType, Service service, String identifier) {
         // Ensure names are always lowercase
         if (resourceIdType == ResourceIdType.NAME) {
@@ -115,6 +119,11 @@ public class ArbitraryDataReader {
         return new ArbitraryDataBuildQueueItem(this.resourceId, this.resourceIdType, this.service, this.identifier);
     }
 
+    private ArbitraryDataResource createArbitraryDataResource() {
+        return new ArbitraryDataResource(this.resourceId, this.resourceIdType, this.service, this.identifier);
+    }
+
+
     /**
      * loadAsynchronously
      *
@@ -162,6 +171,8 @@ public class ArbitraryDataReader {
                 return;
             }
 
+            this.arbitraryDataResource = this.createArbitraryDataResource();
+
             this.preExecute();
             this.deleteExistingFiles();
             this.fetch();
@@ -169,9 +180,18 @@ public class ArbitraryDataReader {
             this.uncompress();
             this.validate();
 
-        } catch (DataException e) {
+        } catch (DataNotPublishedException e) {
+            if (e.getMessage() != null) {
+                // Log the message only, to avoid spamming the logs with a full stack trace
+                LOGGER.debug("DataNotPublishedException when trying to load QDN resource: {}", e.getMessage());
+            }
             this.deleteWorkingDirectory();
-            throw new DataException(e.getMessage());
+            throw e;
+
+        } catch (DataException e) {
+            LOGGER.info("DataException when trying to load QDN resource", e);
+            this.deleteWorkingDirectory();
+            throw e;
 
         } finally {
             this.postExecute();
@@ -208,8 +228,13 @@ public class ArbitraryDataReader {
      * serve a cached version of the resource for subsequent requests.
      * @throws IOException
      */
-    private void deleteWorkingDirectory() throws IOException {
+    private void deleteWorkingDirectory() {
-        FilesystemUtils.safeDeleteDirectory(this.workingPath, true);
+        try {
+            FilesystemUtils.safeDeleteDirectory(this.workingPath, true);
+        } catch (IOException e) {
+            // Ignore failures as this isn't an essential step
+            LOGGER.info("Unable to delete working path {}: {}", this.workingPath, e.getMessage());
+        }
     }
 
     private void createUncompressedDirectory() throws DataException {
@@ -408,6 +433,7 @@ public class ArbitraryDataReader {
             this.decryptUsingAlgo("AES/CBC/PKCS5Padding");
 
         } catch (DataException e) {
+            LOGGER.info("Unable to decrypt using specific parameters: {}", e.getMessage());
             // Something went wrong, so fall back to default AES params (necessary for legacy resource support)
             this.decryptUsingAlgo("AES");
 
@@ -420,8 +446,9 @@ public class ArbitraryDataReader {
         byte[] secret = this.secret58 != null ? Base58.decode(this.secret58) : null;
         if (secret != null && secret.length == Transformer.AES256_LENGTH) {
             try {
+                LOGGER.debug("Decrypting {} using algorithm {}...", this.arbitraryDataResource, algorithm);
                 Path unencryptedPath = Paths.get(this.workingPath.toString(), "zipped.zip");
-                SecretKey aesKey = new SecretKeySpec(secret, 0, secret.length, algorithm);
+                SecretKey aesKey = new SecretKeySpec(secret, 0, secret.length, "AES");
                 AES.decryptFile(algorithm, aesKey, this.filePath.toString(), unencryptedPath.toString());
 
                 // Replace filePath pointer with the encrypted file path
@@ -430,7 +457,8 @@ public class ArbitraryDataReader {
 
             } catch (NoSuchAlgorithmException | InvalidAlgorithmParameterException | NoSuchPaddingException
                     | BadPaddingException | IllegalBlockSizeException | IOException | InvalidKeyException e) {
-                throw new DataException(String.format("Unable to decrypt file at path %s: %s", this.filePath, e.getMessage()));
+                LOGGER.info(String.format("Exception when decrypting %s using algorithm %s", this.arbitraryDataResource, algorithm), e);
+                throw new DataException(String.format("Unable to decrypt file at path %s using algorithm %s: %s", this.filePath, algorithm, e.getMessage()));
             }
         } else {
             // Assume it is unencrypted. This will be the case when we have built a custom path by combining
@@ -477,7 +505,12 @@ public class ArbitraryDataReader {
         // Delete original compressed file
         if (FilesystemUtils.pathInsideDataOrTempPath(this.filePath)) {
             if (Files.exists(this.filePath)) {
-                Files.delete(this.filePath);
+                try {
+                    Files.delete(this.filePath);
+                } catch (IOException e) {
+                    // Ignore failures as this isn't an essential step
+                    LOGGER.info("Unable to delete file at path {}", this.filePath);
+                }
             }
         }
 

src/main/java/org/qortal/arbitrary/ArbitraryDataResource.java

@@ -3,6 +3,7 @@ package org.qortal.arbitrary;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.qortal.arbitrary.ArbitraryDataFile.ResourceIdType;
+import org.qortal.arbitrary.exception.DataNotPublishedException;
 import org.qortal.arbitrary.metadata.ArbitraryDataTransactionMetadata;
 import org.qortal.arbitrary.misc.Service;
 import org.qortal.controller.arbitrary.ArbitraryDataBuildManager;
@@ -325,7 +326,7 @@ public class ArbitraryDataResource {
             if (latestPut == null) {
                 String message = String.format("Couldn't find PUT transaction for name %s, service %s and identifier %s",
                         this.resourceId, this.service, this.identifierString());
-                throw new DataException(message);
+                throw new DataNotPublishedException(message);
             }
             this.latestPutTransaction = latestPut;
 

src/main/java/org/qortal/arbitrary/ArbitraryDataWriter.java

@@ -23,16 +23,13 @@ import javax.crypto.NoSuchPaddingException;
 import javax.crypto.SecretKey;
 import java.io.File;
 import java.io.IOException;
-import java.nio.file.Files;
+import java.nio.file.*;
-import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.security.InvalidAlgorithmParameterException;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.Iterator;
+import java.util.stream.Collectors;
-import java.util.List;
+import java.util.stream.Stream;
-import java.util.Objects;
 
 public class ArbitraryDataWriter {
 
@@ -50,6 +47,7 @@ public class ArbitraryDataWriter {
     private final String description;
     private final List<String> tags;
     private final Category category;
+    private List<String> files;
 
     private int chunkSize = ArbitraryDataFile.CHUNK_SIZE;
 
@@ -80,12 +78,14 @@ public class ArbitraryDataWriter {
         this.description = ArbitraryDataTransactionMetadata.limitDescription(description);
         this.tags = ArbitraryDataTransactionMetadata.limitTags(tags);
         this.category = category;
+        this.files = new ArrayList<>(); // Populated in buildFileList()
     }
 
     public void save() throws IOException, DataException, InterruptedException, MissingDataException {
         try {
             this.preExecute();
             this.validateService();
+            this.buildFileList();
             this.process();
             this.compress();
             this.encrypt();
@@ -143,6 +143,24 @@ public class ArbitraryDataWriter {
         }
     }
 
+    private void buildFileList() throws IOException {
+        // Single file resources consist of a single element in the file list
+        boolean isSingleFile = this.filePath.toFile().isFile();
+        if (isSingleFile) {
+            this.files.add(this.filePath.getFileName().toString());
+            return;
+        }
+
+        // Multi file resources require a walk through the directory tree
+        try (Stream<Path> stream = Files.walk(this.filePath)) {
+            this.files = stream
+                    .filter(Files::isRegularFile)
+                    .map(p -> this.filePath.relativize(p).toString())
+                    .filter(s -> !s.isEmpty())
+                    .collect(Collectors.toList());
+        }
+    }
+
     private void process() throws DataException, IOException, MissingDataException {
         switch (this.method) {
 
@@ -285,6 +303,7 @@ public class ArbitraryDataWriter {
             metadata.setTags(this.tags);
             metadata.setCategory(this.category);
             metadata.setChunks(this.arbitraryDataFile.chunkHashList());
+            metadata.setFiles(this.files);
             metadata.write();
 
             // Create an ArbitraryDataFile from the JSON file (we don't have a signature yet)

src/main/java/org/qortal/arbitrary/exception/DataNotPublishedException.java

@@ -0,0 +1,22 @@
+package org.qortal.arbitrary.exception;
+
+import org.qortal.repository.DataException;
+
+public class DataNotPublishedException extends DataException {
+
+	public DataNotPublishedException() {
+	}
+
+	public DataNotPublishedException(String message) {
+		super(message);
+	}
+
+	public DataNotPublishedException(String message, Throwable cause) {
+		super(message, cause);
+	}
+
+	public DataNotPublishedException(Throwable cause) {
+		super(cause);
+	}
+
+}

src/main/java/org/qortal/arbitrary/metadata/ArbitraryDataTransactionMetadata.java

@@ -19,6 +19,7 @@ public class ArbitraryDataTransactionMetadata extends ArbitraryDataMetadata {
     private String description;
     private List<String> tags;
     private Category category;
+    private List<String> files;
 
     private static int MAX_TITLE_LENGTH = 80;
     private static int MAX_DESCRIPTION_LENGTH = 500;
@@ -77,6 +78,20 @@ public class ArbitraryDataTransactionMetadata extends ArbitraryDataMetadata {
             }
             this.chunks = chunksList;
         }
+
+        List<String> filesList = new ArrayList<>();
+        if (metadata.has("files")) {
+            JSONArray files = metadata.getJSONArray("files");
+            if (files != null) {
+                for (int i=0; i<files.length(); i++) {
+                    String tag = files.getString(i);
+                    if (tag != null) {
+                        filesList.add(tag);
+                    }
+                }
+            }
+            this.files = filesList;
+        }
     }
 
     @Override
@@ -111,6 +126,14 @@ public class ArbitraryDataTransactionMetadata extends ArbitraryDataMetadata {
         }
         outer.put("chunks", chunks);
 
+        JSONArray files = new JSONArray();
+        if (this.files != null) {
+            for (String file : this.files) {
+                files.put(file);
+            }
+        }
+        outer.put("files", files);
+
         this.jsonString = outer.toString(2);
         LOGGER.trace("Transaction metadata: {}", this.jsonString);
     }
@@ -156,6 +179,14 @@ public class ArbitraryDataTransactionMetadata extends ArbitraryDataMetadata {
         return this.category;
     }
 
+    public void setFiles(List<String> files) {
+        this.files = files;
+    }
+
+    public List<String> getFiles() {
+        return this.files;
+    }
+
     public boolean containsChunk(byte[] chunk) {
         for (byte[] c : this.chunks) {
             if (Arrays.equals(c, chunk)) {

src/main/java/org/qortal/arbitrary/misc/Service.java

@@ -1,16 +1,16 @@
 package org.qortal.arbitrary.misc;
 
+import org.apache.commons.io.FilenameUtils;
 import org.json.JSONObject;
 import org.qortal.arbitrary.ArbitraryDataRenderer;
 import org.qortal.transaction.Transaction;
 import org.qortal.utils.FilesystemUtils;
 
+import java.io.File;
 import java.io.IOException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
-import java.util.Arrays;
+import java.util.*;
-import java.util.List;
-import java.util.Map;
 
 import static java.util.Arrays.stream;
 import static java.util.stream.Collectors.toMap;
@@ -18,9 +18,52 @@ import static java.util.stream.Collectors.toMap;
 public enum Service {
     AUTO_UPDATE(1, false, null, null),
     ARBITRARY_DATA(100, false, null, null),
+    QCHAT_ATTACHMENT(120, true, 1024*1024L, null) {
+        @Override
+        public ValidationResult validate(Path path) throws IOException {
+            ValidationResult superclassResult = super.validate(path);
+            if (superclassResult != ValidationResult.OK) {
+                return superclassResult;
+            }
+
+            // Custom validation function to require a single file, with a whitelisted extension
+            int fileCount = 0;
+            File[] files = path.toFile().listFiles();
+            // If already a single file, replace the list with one that contains that file only
+            if (files == null && path.toFile().isFile()) {
+                files = new File[] { path.toFile() };
+            }
+            if (files != null) {
+                for (File file : files) {
+                    if (file.getName().equals(".qortal")) {
+                        continue;
+                    }
+                    if (file.isDirectory()) {
+                        return ValidationResult.DIRECTORIES_NOT_ALLOWED;
+                    }
+                    final String extension = FilenameUtils.getExtension(file.getName()).toLowerCase();
+                    // We must allow blank file extensions because these are used by data published from a plaintext or base64-encoded string
+                    final List<String> allowedExtensions = Arrays.asList("zip", "pdf", "txt", "odt", "ods", "doc", "docx", "xls", "xlsx", "ppt", "pptx", "");
+                    if (extension == null || !allowedExtensions.contains(extension)) {
+                        return ValidationResult.INVALID_FILE_EXTENSION;
+                    }
+                    fileCount++;
+                }
+            }
+            if (fileCount != 1) {
+                return ValidationResult.INVALID_FILE_COUNT;
+            }
+            return ValidationResult.OK;
+        }
+    },
     WEBSITE(200, true, null, null) {
         @Override
-        public ValidationResult validate(Path path) {
+        public ValidationResult validate(Path path) throws IOException {
+            ValidationResult superclassResult = super.validate(path);
+            if (superclassResult != ValidationResult.OK) {
+                return superclassResult;
+            }
+
             // Custom validation function to require an index HTML file in the root directory
             List<String> fileNames = ArbitraryDataRenderer.indexFiles();
             String[] files = path.toFile().list();
@@ -38,6 +81,7 @@ public enum Service {
     GIT_REPOSITORY(300, false, null, null),
     IMAGE(400, true, 10*1024*1024L, null),
     THUMBNAIL(410, true, 500*1024L, null),
+    QCHAT_IMAGE(420, true, 500*1024L, null),
     VIDEO(500, false, null, null),
     AUDIO(600, false, null, null),
     BLOG(700, false, null, null),
@@ -48,7 +92,42 @@ public enum Service {
     PLAYLIST(910, true, null, null),
     APP(1000, false, null, null),
     METADATA(1100, false, null, null),
-    QORTAL_METADATA(1111, true, 10*1024L, Arrays.asList("title", "description", "tags"));
+    GIF_REPOSITORY(1200, true, 25*1024*1024L, null) {
+        @Override
+        public ValidationResult validate(Path path) throws IOException {
+            ValidationResult superclassResult = super.validate(path);
+            if (superclassResult != ValidationResult.OK) {
+                return superclassResult;
+            }
+
+            // Custom validation function to require .gif files only, and at least 1
+            int gifCount = 0;
+            File[] files = path.toFile().listFiles();
+            // If already a single file, replace the list with one that contains that file only
+            if (files == null && path.toFile().isFile()) {
+                files = new File[] { path.toFile() };
+            }
+            if (files != null) {
+                for (File file : files) {
+                    if (file.getName().equals(".qortal")) {
+                        continue;
+                    }
+                    if (file.isDirectory()) {
+                        return ValidationResult.DIRECTORIES_NOT_ALLOWED;
+                    }
+                    String extension = FilenameUtils.getExtension(file.getName()).toLowerCase();
+                    if (!Objects.equals(extension, "gif")) {
+                        return ValidationResult.INVALID_FILE_EXTENSION;
+                    }
+                    gifCount++;
+                }
+            }
+            if (gifCount == 0) {
+                return ValidationResult.MISSING_DATA;
+            }
+            return ValidationResult.OK;
+        }
+    };
 
     public final int value;
     private final boolean requiresValidation;
@@ -114,7 +193,11 @@ public enum Service {
         OK(1),
         MISSING_KEYS(2),
         EXCEEDS_SIZE_LIMIT(3),
-        MISSING_INDEX_FILE(4);
+        MISSING_INDEX_FILE(4),
+        DIRECTORIES_NOT_ALLOWED(5),
+        INVALID_FILE_EXTENSION(6),
+        MISSING_DATA(7),
+        INVALID_FILE_COUNT(8);
 
         public final int value;
 

src/main/java/org/qortal/block/Block.java

@@ -27,6 +27,7 @@ import org.qortal.block.BlockChain.BlockTimingByHeight;
 import org.qortal.block.BlockChain.AccountLevelShareBin;
 import org.qortal.controller.OnlineAccountsManager;
 import org.qortal.crypto.Crypto;
+import org.qortal.crypto.Qortal25519Extras;
 import org.qortal.data.account.AccountBalanceData;
 import org.qortal.data.account.AccountData;
 import org.qortal.data.account.EligibleQoraHolderData;
@@ -88,7 +89,8 @@ public class Block {
 		ONLINE_ACCOUNT_UNKNOWN(71),
 		ONLINE_ACCOUNT_SIGNATURES_MISSING(72),
 		ONLINE_ACCOUNT_SIGNATURES_MALFORMED(73),
-		ONLINE_ACCOUNT_SIGNATURE_INCORRECT(74);
+		ONLINE_ACCOUNT_SIGNATURE_INCORRECT(74),
+		ONLINE_ACCOUNT_NONCE_INCORRECT(75);
 
 		public final int value;
 
@@ -134,7 +136,7 @@ public class Block {
 	}
 
 	/** Lazy-instantiated expanded info on block's online accounts. */
-	private static class ExpandedAccount {
+	public static class ExpandedAccount {
 		private final RewardShareData rewardShareData;
 		private final int sharePercent;
 		private final boolean isRecipientAlsoMinter;
@@ -167,6 +169,13 @@ public class Block {
 			}
 		}
 
+		public Account getMintingAccount() {
+			return this.mintingAccount;
+		}
+		public Account getRecipientAccount() {
+			return this.recipientAccount;
+		}
+
 		/**
 		 * Returns share bin for expanded account.
 		 * <p>
@@ -183,8 +192,11 @@ public class Block {
 			if (accountLevel <= 0)
 				return null; // level 0 isn't included in any share bins
 
+			// Select the correct set of share bins based on block height
 			final BlockChain blockChain = BlockChain.getInstance();
-			final AccountLevelShareBin[] shareBinsByLevel = blockChain.getShareBinsByAccountLevel();
+			final AccountLevelShareBin[] shareBinsByLevel = (blockHeight >= blockChain.getSharesByLevelV2Height()) ?
+					blockChain.getShareBinsByAccountLevelV2() : blockChain.getShareBinsByAccountLevelV1();
+
 			if (accountLevel > shareBinsByLevel.length)
 				return null;
 
@@ -197,6 +209,11 @@ public class Block {
 
 		}
 
+		public boolean hasShareBin(AccountLevelShareBin shareBin, int blockHeight) {
+			AccountLevelShareBin ourShareBin = this.getShareBin(blockHeight);
+			return ourShareBin != null && shareBin.id == ourShareBin.id;
+		}
+
 		public long distribute(long accountAmount, Map<String, Long> balanceChanges) {
 			if (this.isRecipientAlsoMinter) {
 				// minter & recipient the same - simpler case
@@ -221,11 +238,10 @@ public class Block {
 			return accountAmount;
 		}
 	}
+
 	/** Always use getExpandedAccounts() to access this, as it's lazy-instantiated. */
 	private List<ExpandedAccount> cachedExpandedAccounts = null;
 
-	/** Opportunistic cache of this block's valid online accounts. Only created by call to isValid(). */
-	private List<OnlineAccountData> cachedValidOnlineAccounts = null;
 	/** Opportunistic cache of this block's valid online reward-shares. Only created by call to isValid(). */
 	private List<RewardShareData> cachedOnlineRewardShares = null;
 
@@ -347,18 +363,36 @@ public class Block {
 		int version = parentBlock.getNextBlockVersion();
 		byte[] reference = parentBlockData.getSignature();
 
-		// Fetch our list of online accounts
+		// Qortal: minter is always a reward-share, so find actual minter and get their effective minting level
-		List<OnlineAccountData> onlineAccounts = OnlineAccountsManager.getInstance().getOnlineAccounts();
+		int minterLevel = Account.getRewardShareEffectiveMintingLevel(repository, minter.getPublicKey());
-		if (onlineAccounts.isEmpty()) {
+		if (minterLevel == 0) {
-			LOGGER.error("No online accounts - not even our own?");
+			LOGGER.error("Minter effective level returned zero?");
 			return null;
 		}
 
-		// Find newest online accounts timestamp
+		int height = parentBlockData.getHeight() + 1;
-		long onlineAccountsTimestamp = 0;
+		long timestamp = calcTimestamp(parentBlockData, minter.getPublicKey(), minterLevel);
-		for (OnlineAccountData onlineAccountData : onlineAccounts) {
+		long onlineAccountsTimestamp = OnlineAccountsManager.getCurrentOnlineAccountTimestamp();
-			if (onlineAccountData.getTimestamp() > onlineAccountsTimestamp)
+
-				onlineAccountsTimestamp = onlineAccountData.getTimestamp();
+		// Fetch our list of online accounts, removing any that are missing a nonce
+		List<OnlineAccountData> onlineAccounts = OnlineAccountsManager.getInstance().getOnlineAccounts(onlineAccountsTimestamp);
+		onlineAccounts.removeIf(a -> a.getNonce() == null || a.getNonce() < 0);
+
+		// After feature trigger, remove any online accounts that are level 0
+		if (height >= BlockChain.getInstance().getOnlineAccountMinterLevelValidationHeight()) {
+			onlineAccounts.removeIf(a -> {
+				try {
+					return Account.getRewardShareEffectiveMintingLevel(repository, a.getPublicKey()) == 0;
+				} catch (DataException e) {
+					// Something went wrong, so remove the account
+					return true;
+				}
+			});
+		}
+
+		if (onlineAccounts.isEmpty()) {
+			LOGGER.debug("No online accounts - not even our own?");
+			return null;
 		}
 
 		// Load sorted list of reward share public keys into memory, so that the indexes can be obtained.
@@ -369,10 +403,6 @@ public class Block {
 		// Map using index into sorted list of reward-shares as key
 		Map<Integer, OnlineAccountData> indexedOnlineAccounts = new HashMap<>();
 		for (OnlineAccountData onlineAccountData : onlineAccounts) {
-			// Disregard online accounts with different timestamps
-			if (onlineAccountData.getTimestamp() != onlineAccountsTimestamp)
-				continue;
-
 			Integer accountIndex = getRewardShareIndex(onlineAccountData.getPublicKey(), allRewardSharePublicKeys);
 			if (accountIndex == null)
 				// Online account (reward-share) with current timestamp but reward-share cancelled
@@ -389,29 +419,43 @@ public class Block {
 		byte[] encodedOnlineAccounts = BlockTransformer.encodeOnlineAccounts(onlineAccountsSet);
 		int onlineAccountsCount = onlineAccountsSet.size();
 
-		// Concatenate online account timestamp signatures (in correct order)
+		// Collate all signatures
-		byte[] onlineAccountsSignatures = new byte[onlineAccountsCount * Transformer.SIGNATURE_LENGTH];
+		Collection<byte[]> signaturesToAggregate = indexedOnlineAccounts.values()
-		for (int i = 0; i < onlineAccountsCount; ++i) {
+				.stream()
-			Integer accountIndex = accountIndexes.get(i);
+				.map(OnlineAccountData::getSignature)
-			OnlineAccountData onlineAccountData = indexedOnlineAccounts.get(accountIndex);
+				.collect(Collectors.toList());
-			System.arraycopy(onlineAccountData.getSignature(), 0, onlineAccountsSignatures, i * Transformer.SIGNATURE_LENGTH, Transformer.SIGNATURE_LENGTH);
+
+		// Aggregated, single signature
+		byte[] onlineAccountsSignatures = Qortal25519Extras.aggregateSignatures(signaturesToAggregate);
+
+		// Add nonces to the end of the online accounts signatures
+		try {
+			// Create ordered list of nonce values
+			List<Integer> nonces = new ArrayList<>();
+			for (int i = 0; i < onlineAccountsCount; ++i) {
+				Integer accountIndex = accountIndexes.get(i);
+				OnlineAccountData onlineAccountData = indexedOnlineAccounts.get(accountIndex);
+				nonces.add(onlineAccountData.getNonce());
+			}
+
+			// Encode the nonces to a byte array
+			byte[] encodedNonces = BlockTransformer.encodeOnlineAccountNonces(nonces);
+
+			// Append the encoded nonces to the encoded online account signatures
+			ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+			outputStream.write(onlineAccountsSignatures);
+			outputStream.write(encodedNonces);
+			onlineAccountsSignatures = outputStream.toByteArray();
+		}
+		catch (TransformationException | IOException e) {
+			return null;
 		}
 
 		byte[] minterSignature = minter.sign(BlockTransformer.getBytesForMinterSignature(parentBlockData,
 				minter.getPublicKey(), encodedOnlineAccounts));
 
-		// Qortal: minter is always a reward-share, so find actual minter and get their effective minting level
-		int minterLevel = Account.getRewardShareEffectiveMintingLevel(repository, minter.getPublicKey());
-		if (minterLevel == 0) {
-			LOGGER.error("Minter effective level returned zero?");
-			return null;
-		}
-
-		long timestamp = calcTimestamp(parentBlockData, minter.getPublicKey(), minterLevel);
-
 		int transactionCount = 0;
 		byte[] transactionsSignature = null;
-		int height = parentBlockData.getHeight() + 1;
 
 		int atCount = 0;
 		long atFees = 0;
@@ -1005,6 +1049,15 @@ public class Block {
 		if (onlineRewardShares == null)
 			return ValidationResult.ONLINE_ACCOUNT_UNKNOWN;
 
+		// After feature trigger, require all online account minters to be greater than level 0
+		if (this.getBlockData().getHeight() >= BlockChain.getInstance().getOnlineAccountMinterLevelValidationHeight()) {
+			List<ExpandedAccount> expandedAccounts = this.getExpandedAccounts();
+			for (ExpandedAccount account : expandedAccounts) {
+				if (account.getMintingAccount().getEffectiveMintingLevel() == 0)
+					return ValidationResult.ONLINE_ACCOUNTS_INVALID;
+			}
+		}
+
 		// If block is past a certain age then we simply assume the signatures were correct
 		long signatureRequirementThreshold = NTP.getTime() - BlockChain.getInstance().getOnlineAccountSignaturesMinLifetime();
 		if (this.blockData.getTimestamp() < signatureRequirementThreshold)
@@ -1013,49 +1066,64 @@ public class Block {
 		if (this.blockData.getOnlineAccountsSignatures() == null || this.blockData.getOnlineAccountsSignatures().length == 0)
 			return ValidationResult.ONLINE_ACCOUNT_SIGNATURES_MISSING;
 
-		if (this.blockData.getOnlineAccountsSignatures().length != onlineRewardShares.size() * Transformer.SIGNATURE_LENGTH)
+		final int signaturesLength = Transformer.SIGNATURE_LENGTH;
+		final int noncesLength = onlineRewardShares.size() * Transformer.INT_LENGTH;
+
+		// We expect nonces to be appended to the online accounts signatures
+		if (this.blockData.getOnlineAccountsSignatures().length != signaturesLength + noncesLength)
 			return ValidationResult.ONLINE_ACCOUNT_SIGNATURES_MALFORMED;
 
 		// Check signatures
 		long onlineTimestamp = this.blockData.getOnlineAccountsTimestamp();
 		byte[] onlineTimestampBytes = Longs.toByteArray(onlineTimestamp);
 
-		// If this block is much older than current online timestamp, then there's no point checking current online accounts
+		byte[] encodedOnlineAccountSignatures = this.blockData.getOnlineAccountsSignatures();
-		List<OnlineAccountData> currentOnlineAccounts = onlineTimestamp < NTP.getTime() - OnlineAccountsManager.ONLINE_TIMESTAMP_MODULUS
-				? null
-				: OnlineAccountsManager.getInstance().getOnlineAccounts();
-		List<OnlineAccountData> latestBlocksOnlineAccounts = OnlineAccountsManager.getInstance().getLatestBlocksOnlineAccounts();
 
-		// Extract online accounts' timestamp signatures from block data
+		// Split online account signatures into signature(s) + nonces, then validate the nonces
-		List<byte[]> onlineAccountsSignatures = BlockTransformer.decodeTimestampSignatures(this.blockData.getOnlineAccountsSignatures());
+		byte[] extractedSignatures = BlockTransformer.extract(encodedOnlineAccountSignatures, 0, signaturesLength);
+		byte[] extractedNonces = BlockTransformer.extract(encodedOnlineAccountSignatures, signaturesLength, onlineRewardShares.size() * Transformer.INT_LENGTH);
+		encodedOnlineAccountSignatures = extractedSignatures;
 
-		// We'll build up a list of online accounts to hand over to Controller if block is added to chain
+		List<Integer> nonces = BlockTransformer.decodeOnlineAccountNonces(extractedNonces);
-		// and this will become latestBlocksOnlineAccounts (above) to reduce CPU load when we process next block...
-		List<OnlineAccountData> ourOnlineAccounts = new ArrayList<>();
 
-		for (int i = 0; i < onlineAccountsSignatures.size(); ++i) {
+		// Build block's view of online accounts (without signatures, as we don't need them here)
-			byte[] signature = onlineAccountsSignatures.get(i);
+		Set<OnlineAccountData> onlineAccounts = new HashSet<>();
+		for (int i = 0; i < onlineRewardShares.size(); ++i) {
+			Integer nonce = nonces.get(i);
 			byte[] publicKey = onlineRewardShares.get(i).getRewardSharePublicKey();
 
-			OnlineAccountData onlineAccountData = new OnlineAccountData(onlineTimestamp, signature, publicKey);
+			OnlineAccountData onlineAccountData = new OnlineAccountData(onlineTimestamp, null, publicKey, nonce);
-			ourOnlineAccounts.add(onlineAccountData);
+			onlineAccounts.add(onlineAccountData);
-
-			// If signature is still current then no need to perform Ed25519 verify
-			if (currentOnlineAccounts != null && currentOnlineAccounts.remove(onlineAccountData))
-				// remove() returned true, so online account still current
-				// and one less entry in currentOnlineAccounts to check next time
-				continue;
-
-			// If signature was okay in latest block then no need to perform Ed25519 verify
-			if (latestBlocksOnlineAccounts != null && latestBlocksOnlineAccounts.contains(onlineAccountData))
-				continue;
-
-			if (!Crypto.verify(publicKey, signature, onlineTimestampBytes))
-				return ValidationResult.ONLINE_ACCOUNT_SIGNATURE_INCORRECT;
 		}
 
+		// Remove those already validated & cached by online accounts manager - no need to re-validate them
+		OnlineAccountsManager.getInstance().removeKnown(onlineAccounts, onlineTimestamp);
+
+		// Validate the rest
+		for (OnlineAccountData onlineAccount : onlineAccounts)
+			if (!OnlineAccountsManager.getInstance().verifyMemoryPoW(onlineAccount, null))
+				return ValidationResult.ONLINE_ACCOUNT_NONCE_INCORRECT;
+
+		// Cache the valid online accounts as they will likely be needed for the next block
+		OnlineAccountsManager.getInstance().addBlocksOnlineAccounts(onlineAccounts, onlineTimestamp);
+
+		// Extract online accounts' timestamp signatures from block data. Only one signature if aggregated.
+		List<byte[]> onlineAccountsSignatures = BlockTransformer.decodeTimestampSignatures(encodedOnlineAccountSignatures);
+
+		// Aggregate all public keys
+		Collection<byte[]> publicKeys = onlineRewardShares.stream()
+				.map(RewardShareData::getRewardSharePublicKey)
+				.collect(Collectors.toList());
+
+		byte[] aggregatePublicKey = Qortal25519Extras.aggregatePublicKeys(publicKeys);
+
+		byte[] aggregateSignature = onlineAccountsSignatures.get(0);
+
+		// One-step verification of aggregate signature using aggregate public key
+		if (!Qortal25519Extras.verifyAggregated(aggregatePublicKey, aggregateSignature, onlineTimestampBytes))
+			return ValidationResult.ONLINE_ACCOUNT_SIGNATURE_INCORRECT;
+
 		// All online accounts valid, so save our list of online accounts for potential later use
-		this.cachedValidOnlineAccounts = ourOnlineAccounts;
 		this.cachedOnlineRewardShares = onlineRewardShares;
 
 		return ValidationResult.OK;
@@ -1202,6 +1270,7 @@ public class Block {
 				}
 			}
 		} catch (DataException e) {
+			LOGGER.info("DataException during transaction validation", e);
 			return ValidationResult.TRANSACTION_INVALID;
 		} finally {
 			// Rollback repository changes made by test-processing transactions above
@@ -1394,6 +1463,9 @@ public class Block {
 			if (this.blockData.getHeight() == 212937)
 				// Apply fix for block 212937
 				Block212937.processFix(this);
+
+			else if (this.blockData.getHeight() == BlockChain.getInstance().getSelfSponsorshipAlgoV1Height())
+				SelfSponsorshipAlgoV1Block.processAccountPenalties(this);
 		}
 
 		// We're about to (test-)process a batch of transactions,
@@ -1426,9 +1498,6 @@ public class Block {
 
 		postBlockTidy();
 
-		// Give Controller our cached, valid online accounts data (if any) to help reduce CPU load for next block
-		OnlineAccountsManager.getInstance().pushLatestBlocksOnlineAccounts(this.cachedValidOnlineAccounts);
-
 		// Log some debugging info relating to the block weight calculation
 		this.logDebugInfo();
 	}
@@ -1453,19 +1522,23 @@ public class Block {
 		// Batch update in repository
 		repository.getAccountRepository().modifyMintedBlockCounts(allUniqueExpandedAccounts.stream().map(AccountData::getAddress).collect(Collectors.toList()), +1);
 
+		// Keep track of level bumps in case we need to apply to other entries
+		Map<String, Integer> bumpedAccounts = new HashMap<>();
+
 		// Local changes and also checks for level bump
 		for (AccountData accountData : allUniqueExpandedAccounts) {
 			// Adjust count locally (in Java)
 			accountData.setBlocksMinted(accountData.getBlocksMinted() + 1);
 			LOGGER.trace(() -> String.format("Block minter %s up to %d minted block%s", accountData.getAddress(), accountData.getBlocksMinted(), (accountData.getBlocksMinted() != 1 ? "s" : "")));
 
-			final int effectiveBlocksMinted = accountData.getBlocksMinted() + accountData.getBlocksMintedAdjustment();
+			final int effectiveBlocksMinted = accountData.getBlocksMinted() + accountData.getBlocksMintedAdjustment() + accountData.getBlocksMintedPenalty();
 
 			for (int newLevel = maximumLevel; newLevel >= 0; --newLevel)
 				if (effectiveBlocksMinted >= cumulativeBlocksByLevel.get(newLevel)) {
 					if (newLevel > accountData.getLevel()) {
 						// Account has increased in level!
 						accountData.setLevel(newLevel);
+						bumpedAccounts.put(accountData.getAddress(), newLevel);
 						repository.getAccountRepository().setLevel(accountData);
 						LOGGER.trace(() -> String.format("Block minter %s bumped to level %d", accountData.getAddress(), accountData.getLevel()));
 					}
@@ -1473,6 +1546,25 @@ public class Block {
 					break;
 				}
 		}
+
+		// Also bump other entries if need be
+		if (!bumpedAccounts.isEmpty()) {
+			for (ExpandedAccount expandedAccount : expandedAccounts) {
+				Integer newLevel = bumpedAccounts.get(expandedAccount.mintingAccountData.getAddress());
+				if (newLevel != null && expandedAccount.mintingAccountData.getLevel() != newLevel) {
+					expandedAccount.mintingAccountData.setLevel(newLevel);
+					LOGGER.trace("Also bumped {} to level {}", expandedAccount.mintingAccountData.getAddress(), newLevel);
+				}
+
+				if (!expandedAccount.isRecipientAlsoMinter) {
+					newLevel = bumpedAccounts.get(expandedAccount.recipientAccountData.getAddress());
+					if (newLevel != null && expandedAccount.recipientAccountData.getLevel() != newLevel) {
+						expandedAccount.recipientAccountData.setLevel(newLevel);
+						LOGGER.trace("Also bumped {} to level {}", expandedAccount.recipientAccountData.getAddress(), newLevel);
+					}
+				}
+			}
+		}
 	}
 
 	protected void processBlockRewards() throws DataException {
@@ -1632,6 +1724,9 @@ public class Block {
 				// Revert fix for block 212937
 				Block212937.orphanFix(this);
 
+			else if (this.blockData.getHeight() == BlockChain.getInstance().getSelfSponsorshipAlgoV1Height())
+				SelfSponsorshipAlgoV1Block.orphanAccountPenalties(this);
+
 			// Block rewards, including transaction fees, removed after transactions undone
 			orphanBlockRewards();
 
@@ -1644,9 +1739,6 @@ public class Block {
 		this.blockData.setHeight(null);
 
 		postBlockTidy();
-
-		// Remove any cached, valid online accounts data from Controller
-		OnlineAccountsManager.getInstance().popLatestBlocksOnlineAccounts();
 	}
 
 	protected void orphanTransactionsFromBlock() throws DataException {
@@ -1763,7 +1855,7 @@ public class Block {
 			accountData.setBlocksMinted(accountData.getBlocksMinted() - 1);
 			LOGGER.trace(() -> String.format("Block minter %s down to %d minted block%s", accountData.getAddress(), accountData.getBlocksMinted(), (accountData.getBlocksMinted() != 1 ? "s" : "")));
 
-			final int effectiveBlocksMinted = accountData.getBlocksMinted() + accountData.getBlocksMintedAdjustment();
+			final int effectiveBlocksMinted = accountData.getBlocksMinted() + accountData.getBlocksMintedAdjustment() + accountData.getBlocksMintedPenalty();
 
 			for (int newLevel = maximumLevel; newLevel >= 0; --newLevel)
 				if (effectiveBlocksMinted >= cumulativeBlocksByLevel.get(newLevel)) {
@@ -1883,13 +1975,72 @@ public class Block {
 		final List<ExpandedAccount> onlineFounderAccounts = expandedAccounts.stream().filter(expandedAccount -> expandedAccount.isMinterFounder).collect(Collectors.toList());
 		final boolean haveFounders = !onlineFounderAccounts.isEmpty();
 
+		// Select the correct set of share bins based on block height
+		List<AccountLevelShareBin> accountLevelShareBinsForBlock = (this.blockData.getHeight() >= BlockChain.getInstance().getSharesByLevelV2Height()) ?
+				BlockChain.getInstance().getAccountLevelShareBinsV2() : BlockChain.getInstance().getAccountLevelShareBinsV1();
+
 		// Determine reward candidates based on account level
-		List<AccountLevelShareBin> accountLevelShareBins = BlockChain.getInstance().getAccountLevelShareBins();
+		// This needs a deep copy, so the shares can be modified when tiers aren't activated yet
-		for (int binIndex = 0; binIndex < accountLevelShareBins.size(); ++binIndex) {
+		List<AccountLevelShareBin> accountLevelShareBins = new ArrayList<>();
-			// Find all accounts in share bin. getShareBin() returns null for minter accounts that are also founders, so they are effectively filtered out.
+		for (AccountLevelShareBin accountLevelShareBin : accountLevelShareBinsForBlock) {
+			accountLevelShareBins.add((AccountLevelShareBin) accountLevelShareBin.clone());
+		}
+
+		Map<Integer, List<ExpandedAccount>> accountsForShareBin = new HashMap<>();
+
+		// We might need to combine some share bins if they haven't reached the minimum number of minters yet
+		for (int binIndex = accountLevelShareBins.size()-1; binIndex >= 0; --binIndex) {
 			AccountLevelShareBin accountLevelShareBin = accountLevelShareBins.get(binIndex);
-			// Object reference compare is OK as all references are read-only from blockchain config.
+
-			List<ExpandedAccount> binnedAccounts = expandedAccounts.stream().filter(accountInfo -> accountInfo.getShareBin(this.blockData.getHeight()) == accountLevelShareBin).collect(Collectors.toList());
+			// Find all accounts in share bin. getShareBin() returns null for minter accounts that are also founders, so they are effectively filtered out.
+			List<ExpandedAccount> binnedAccounts = expandedAccounts.stream().filter(accountInfo -> accountInfo.hasShareBin(accountLevelShareBin, this.blockData.getHeight())).collect(Collectors.toList());
+			// Add any accounts that have been moved down from a higher tier
+			List<ExpandedAccount> existingBinnedAccounts = accountsForShareBin.get(binIndex);
+			if (existingBinnedAccounts != null)
+				binnedAccounts.addAll(existingBinnedAccounts);
+
+			// Logic below may only apply to higher levels, and only for share bins with a specific range of online accounts
+			if (accountLevelShareBin.levels.get(0) < BlockChain.getInstance().getShareBinActivationMinLevel() ||
+					binnedAccounts.isEmpty() || binnedAccounts.size() >= BlockChain.getInstance().getMinAccountsToActivateShareBin()) {
+				// Add all accounts for this share bin to the accountsForShareBin list
+				accountsForShareBin.put(binIndex, binnedAccounts);
+				continue;
+			}
+
+			// Share bin contains more than one, but less than the minimum number of minters. We treat this share bin
+			// as not activated yet. In these cases, the rewards and minters are combined and paid out to the previous
+			// share bin, to prevent a single or handful of accounts receiving the entire rewards for a share bin.
+			//
+			// Example:
+			//
+			// - Share bin for levels 5 and 6 has 100 minters
+			// - Share bin for levels 7 and 8 has 10 minters
+			//
+			// This is below the minimum of 30, so share bins are reconstructed as follows:
+			//
+			// - Share bin for levels 5 and 6 now contains 110 minters
+			// - Share bin for levels 7 and 8 now contains 0 minters
+			// - Share bin for levels 5 and 6 now pays out rewards for levels 5, 6, 7, and 8
+			// - Share bin for levels 7 and 8 pays zero rewards
+			//
+			// This process is iterative, so will combine several tiers if needed.
+
+			// Designate this share bin as empty
+			accountsForShareBin.put(binIndex, new ArrayList<>());
+
+			// Move the accounts originally intended for this share bin to the previous one
+			accountsForShareBin.put(binIndex - 1, binnedAccounts);
+
+			// Move the block reward from this share bin to the previous one
+			AccountLevelShareBin previousShareBin = accountLevelShareBins.get(binIndex - 1);
+			previousShareBin.share += accountLevelShareBin.share;
+			accountLevelShareBin.share = 0L;
+		}
+
+		// Now loop through (potentially modified) share bins and determine the reward candidates
+		for (int binIndex = 0; binIndex < accountLevelShareBins.size(); ++binIndex) {
+			AccountLevelShareBin accountLevelShareBin = accountLevelShareBins.get(binIndex);
+			List<ExpandedAccount> binnedAccounts = accountsForShareBin.get(binIndex);
 
 			// No online accounts in this bin? Skip to next one
 			if (binnedAccounts.isEmpty())
@@ -1907,7 +2058,7 @@ public class Block {
 		// Fetch list of legacy QORA holders who haven't reached their cap of QORT reward.
 		List<EligibleQoraHolderData> qoraHolders = this.repository.getAccountRepository().getEligibleLegacyQoraHolders(isProcessingNotOrphaning ? null : this.blockData.getHeight());
 		final boolean haveQoraHolders = !qoraHolders.isEmpty();
-		final long qoraHoldersShare = BlockChain.getInstance().getQoraHoldersShare();
+		final long qoraHoldersShare = BlockChain.getInstance().getQoraHoldersShareAtHeight(this.blockData.getHeight());
 
 		// Perform account-level-based reward scaling if appropriate
 		if (!haveFounders) {

src/main/java/org/qortal/block/BlockChain.java

@@ -68,10 +68,17 @@ public class BlockChain {
 		atFindNextTransactionFix,
 		newBlockSigHeight,
 		shareBinFix,
+		sharesByLevelV2Height,
+		rewardShareLimitTimestamp,
 		calcChainWeightTimestamp,
 		transactionV5Timestamp,
 		transactionV6Timestamp,
-		disableReferenceTimestamp
+		disableReferenceTimestamp,
+		increaseOnlineAccountsDifficultyTimestamp,
+		onlineAccountMinterLevelValidationHeight,
+		selfSponsorshipAlgoV1Height,
+		feeValidationFixTimestamp,
+		chatReferenceTimestamp;
 	}
 
 	// Custom transaction fees
@@ -93,6 +100,13 @@ public class BlockChain {
 	/** Whether only one registered name is allowed per account. */
 	private boolean oneNamePerAccount = false;
 
+	/** Checkpoints */
+	public static class Checkpoint {
+		public int height;
+		public String signature;
+	}
+	private List<Checkpoint> checkpoints;
+
 	/** Block rewards by block height */
 	public static class RewardByHeight {
 		public int height;
@@ -102,23 +116,48 @@ public class BlockChain {
 	private List<RewardByHeight> rewardsByHeight;
 
 	/** Share of block reward/fees by account level */
-	public static class AccountLevelShareBin {
+	public static class AccountLevelShareBin implements Cloneable {
+		public int id;
 		public List<Integer> levels;
 		@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
 		public long share;
-	}
-	private List<AccountLevelShareBin> sharesByLevel;
-	/** Generated lookup of share-bin by account level */
-	private AccountLevelShareBin[] shareBinsByLevel;
 
-	/** Share of block reward/fees to legacy QORA coin holders */
+		public Object clone() {
-	@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
+			AccountLevelShareBin shareBinCopy = new AccountLevelShareBin();
-	private Long qoraHoldersShare;
+			List<Integer> levelsCopy = new ArrayList<>();
+			for (Integer level : this.levels) {
+				levelsCopy.add(level);
+			}
+			shareBinCopy.id = this.id;
+			shareBinCopy.levels = levelsCopy;
+			shareBinCopy.share = this.share;
+			return shareBinCopy;
+		}
+	}
+	private List<AccountLevelShareBin> sharesByLevelV1;
+	private List<AccountLevelShareBin> sharesByLevelV2;
+	/** Generated lookup of share-bin by account level */
+	private AccountLevelShareBin[] shareBinsByLevelV1;
+	private AccountLevelShareBin[] shareBinsByLevelV2;
+
+	/** Share of block reward/fees to legacy QORA coin holders, by block height */
+	public static class ShareByHeight {
+		public int height;
+		@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
+		public long share;
+	}
+	private List<ShareByHeight> qoraHoldersShareByHeight;
 
 	/** How many legacy QORA per 1 QORT of block reward. */
 	@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
 	private Long qoraPerQortReward;
 
+	/** Minimum number of accounts before a share bin is considered activated */
+	private int minAccountsToActivateShareBin;
+
+	/** Min level at which share bin activation takes place; lower levels allow less than minAccountsPerShareBin */
+	private int shareBinActivationMinLevel;
+
 	/**
 	 * Number of minted blocks required to reach next level from previous.
 	 * <p>
@@ -156,7 +195,7 @@ public class BlockChain {
 	private int minAccountLevelToMint;
 	private int minAccountLevelForBlockSubmissions;
 	private int minAccountLevelToRewardShare;
-	private int maxRewardSharesPerMintingAccount;
+	private int maxRewardSharesPerFounderMintingAccount;
 	private int founderEffectiveMintingLevel;
 
 	/** Minimum time to retain online account signatures (ms) for block validity checks. */
@@ -164,6 +203,20 @@ public class BlockChain {
 	/** Maximum time to retain online account signatures (ms) for block validity checks, to allow for clock variance. */
 	private long onlineAccountSignaturesMaxLifetime;
 
+	/** Feature trigger timestamp for ONLINE_ACCOUNTS_MODULUS time interval increase. Can't use
+	 * featureTriggers because unit tests need to set this value via Reflection. */
+	private long onlineAccountsModulusV2Timestamp;
+
+	/** Snapshot timestamp for self sponsorship algo V1 */
+	private long selfSponsorshipAlgoV1SnapshotTimestamp;
+
+	/** Max reward shares by block height */
+	public static class MaxRewardSharesByTimestamp {
+		public long timestamp;
+		public int maxShares;
+	}
+	private List<MaxRewardSharesByTimestamp> maxRewardSharesByTimestamp;
+
 	/** Settings relating to CIYAM AT feature. */
 	public static class CiyamAtSettings {
 		/** Fee per step/op-code executed. */
@@ -312,6 +365,16 @@ public class BlockChain {
 		return this.maxBlockSize;
 	}
 
+	// Online accounts
+	public long getOnlineAccountsModulusV2Timestamp() {
+		return this.onlineAccountsModulusV2Timestamp;
+	}
+
+	// Self sponsorship algo
+	public long getSelfSponsorshipAlgoV1SnapshotTimestamp() {
+		return this.selfSponsorshipAlgoV1SnapshotTimestamp;
+	}
+
 	/** Returns true if approval-needing transaction types require a txGroupId other than NO_GROUP. */
 	public boolean getRequireGroupForApproval() {
 		return this.requireGroupForApproval;
@@ -325,16 +388,28 @@ public class BlockChain {
 		return this.oneNamePerAccount;
 	}
 
+	public List<Checkpoint> getCheckpoints() {
+		return this.checkpoints;
+	}
+
 	public List<RewardByHeight> getBlockRewardsByHeight() {
 		return this.rewardsByHeight;
 	}
 
-	public List<AccountLevelShareBin> getAccountLevelShareBins() {
+	public List<AccountLevelShareBin> getAccountLevelShareBinsV1() {
-		return this.sharesByLevel;
+		return this.sharesByLevelV1;
 	}
 
-	public AccountLevelShareBin[] getShareBinsByAccountLevel() {
+	public List<AccountLevelShareBin> getAccountLevelShareBinsV2() {
-		return this.shareBinsByLevel;
+		return this.sharesByLevelV2;
+	}
+
+	public AccountLevelShareBin[] getShareBinsByAccountLevelV1() {
+		return this.shareBinsByLevelV1;
+	}
+
+	public AccountLevelShareBin[] getShareBinsByAccountLevelV2() {
+		return this.shareBinsByLevelV2;
 	}
 
 	public List<Integer> getBlocksNeededByLevel() {
@@ -345,14 +420,18 @@ public class BlockChain {
 		return this.cumulativeBlocksByLevel;
 	}
 
-	public long getQoraHoldersShare() {
-		return this.qoraHoldersShare;
-	}
-
 	public long getQoraPerQortReward() {
 		return this.qoraPerQortReward;
 	}
 
+	public int getMinAccountsToActivateShareBin() {
+		return this.minAccountsToActivateShareBin;
+	}
+
+	public int getShareBinActivationMinLevel() {
+		return this.shareBinActivationMinLevel;
+	}
+
 	public int getMinAccountLevelToMint() {
 		return this.minAccountLevelToMint;
 	}
@@ -365,8 +444,8 @@ public class BlockChain {
 		return this.minAccountLevelToRewardShare;
 	}
 
-	public int getMaxRewardSharesPerMintingAccount() {
+	public int getMaxRewardSharesPerFounderMintingAccount() {
-		return this.maxRewardSharesPerMintingAccount;
+		return this.maxRewardSharesPerFounderMintingAccount;
 	}
 
 	public int getFounderEffectiveMintingLevel() {
@@ -399,6 +478,14 @@ public class BlockChain {
 		return this.featureTriggers.get(FeatureTrigger.shareBinFix.name()).intValue();
 	}
 
+	public int getSharesByLevelV2Height() {
+		return this.featureTriggers.get(FeatureTrigger.sharesByLevelV2Height.name()).intValue();
+	}
+
+	public long getRewardShareLimitTimestamp() {
+		return this.featureTriggers.get(FeatureTrigger.rewardShareLimitTimestamp.name()).longValue();
+	}
+
 	public long getCalcChainWeightTimestamp() {
 		return this.featureTriggers.get(FeatureTrigger.calcChainWeightTimestamp.name()).longValue();
 	}
@@ -415,6 +502,27 @@ public class BlockChain {
 		return this.featureTriggers.get(FeatureTrigger.disableReferenceTimestamp.name()).longValue();
 	}
 
+	public long getIncreaseOnlineAccountsDifficultyTimestamp() {
+		return this.featureTriggers.get(FeatureTrigger.increaseOnlineAccountsDifficultyTimestamp.name()).longValue();
+	}
+
+	public int getSelfSponsorshipAlgoV1Height() {
+		return this.featureTriggers.get(FeatureTrigger.selfSponsorshipAlgoV1Height.name()).intValue();
+	}
+
+	public long getOnlineAccountMinterLevelValidationHeight() {
+		return this.featureTriggers.get(FeatureTrigger.onlineAccountMinterLevelValidationHeight.name()).intValue();
+	}
+
+	public long getFeeValidationFixTimestamp() {
+		return this.featureTriggers.get(FeatureTrigger.feeValidationFixTimestamp.name()).longValue();
+	}
+
+	public long getChatReferenceTimestamp() {
+		return this.featureTriggers.get(FeatureTrigger.chatReferenceTimestamp.name()).longValue();
+	}
+
+
 	// More complex getters for aspects that change by height or timestamp
 
 	public long getRewardAtHeight(int ourHeight) {
@@ -443,6 +551,23 @@ public class BlockChain {
 		return this.getUnitFee();
 	}
 
+	public int getMaxRewardSharesAtTimestamp(long ourTimestamp) {
+		for (int i = maxRewardSharesByTimestamp.size() - 1; i >= 0; --i)
+			if (maxRewardSharesByTimestamp.get(i).timestamp <= ourTimestamp)
+				return maxRewardSharesByTimestamp.get(i).maxShares;
+
+		return 0;
+	}
+
+	public long getQoraHoldersShareAtHeight(int ourHeight) {
+		// Scan through for QORA share at our height
+		for (int i = qoraHoldersShareByHeight.size() - 1; i >= 0; --i)
+			if (qoraHoldersShareByHeight.get(i).height <= ourHeight)
+				return qoraHoldersShareByHeight.get(i).share;
+
+		return 0;
+	}
+
 	/** Validate blockchain config read from JSON */
 	private void validateConfig() {
 		if (this.genesisInfo == null)
@@ -451,11 +576,14 @@ public class BlockChain {
 		if (this.rewardsByHeight == null)
 			Settings.throwValidationError("No \"rewardsByHeight\" entry found in blockchain config");
 
-		if (this.sharesByLevel == null)
+		if (this.sharesByLevelV1 == null)
-			Settings.throwValidationError("No \"sharesByLevel\" entry found in blockchain config");
+			Settings.throwValidationError("No \"sharesByLevelV1\" entry found in blockchain config");
 
-		if (this.qoraHoldersShare == null)
+		if (this.sharesByLevelV2 == null)
-			Settings.throwValidationError("No \"qoraHoldersShare\" entry found in blockchain config");
+			Settings.throwValidationError("No \"sharesByLevelV2\" entry found in blockchain config");
+
+		if (this.qoraHoldersShareByHeight == null)
+			Settings.throwValidationError("No \"qoraHoldersShareByHeight\" entry found in blockchain config");
 
 		if (this.qoraPerQortReward == null)
 			Settings.throwValidationError("No \"qoraPerQortReward\" entry found in blockchain config");
@@ -492,13 +620,22 @@ public class BlockChain {
 			if (!this.featureTriggers.containsKey(featureTrigger.name()))
 				Settings.throwValidationError(String.format("Missing feature trigger \"%s\" in blockchain config", featureTrigger.name()));
 
-		// Check block reward share bounds
+		// Check block reward share bounds (V1)
-		long totalShare = this.qoraHoldersShare;
+		long totalShareV1 = this.qoraHoldersShareByHeight.get(0).share;
 		// Add share percents for account-level-based rewards
-		for (AccountLevelShareBin accountLevelShareBin : this.sharesByLevel)
+		for (AccountLevelShareBin accountLevelShareBin : this.sharesByLevelV1)
-			totalShare += accountLevelShareBin.share;
+			totalShareV1 += accountLevelShareBin.share;
 
-		if (totalShare < 0 || totalShare > 1_00000000L)
+		if (totalShareV1 < 0 || totalShareV1 > 1_00000000L)
+			Settings.throwValidationError("Total non-founder share out of bounds (0<x<1e8)");
+
+		// Check block reward share bounds (V2)
+		long totalShareV2 = this.qoraHoldersShareByHeight.get(1).share;
+		// Add share percents for account-level-based rewards
+		for (AccountLevelShareBin accountLevelShareBin : this.sharesByLevelV2)
+			totalShareV2 += accountLevelShareBin.share;
+
+		if (totalShareV2 < 0 || totalShareV2 > 1_00000000L)
 			Settings.throwValidationError("Total non-founder share out of bounds (0<x<1e8)");
 	}
 
@@ -514,23 +651,34 @@ public class BlockChain {
 				cumulativeBlocks += this.blocksNeededByLevel.get(level);
 		}
 
-		// Generate lookup-array for account-level share bins
+		// Generate lookup-array for account-level share bins (V1)
-		AccountLevelShareBin lastAccountLevelShareBin = this.sharesByLevel.get(this.sharesByLevel.size() - 1);
+		AccountLevelShareBin lastAccountLevelShareBinV1 = this.sharesByLevelV1.get(this.sharesByLevelV1.size() - 1);
-		final int lastLevel = lastAccountLevelShareBin.levels.get(lastAccountLevelShareBin.levels.size() - 1);
+		final int lastLevelV1 = lastAccountLevelShareBinV1.levels.get(lastAccountLevelShareBinV1.levels.size() - 1);
-		this.shareBinsByLevel = new AccountLevelShareBin[lastLevel];
+		this.shareBinsByLevelV1 = new AccountLevelShareBin[lastLevelV1];
-
+		for (AccountLevelShareBin accountLevelShareBin : this.sharesByLevelV1)
-		for (AccountLevelShareBin accountLevelShareBin : this.sharesByLevel)
 			for (int level : accountLevelShareBin.levels)
 				// level 1 stored at index 0, level 2 stored at index 1, etc.
 				// level 0 not allowed
-				this.shareBinsByLevel[level - 1] = accountLevelShareBin;
+				this.shareBinsByLevelV1[level - 1] = accountLevelShareBin;
+
+		// Generate lookup-array for account-level share bins (V2)
+		AccountLevelShareBin lastAccountLevelShareBinV2 = this.sharesByLevelV2.get(this.sharesByLevelV2.size() - 1);
+		final int lastLevelV2 = lastAccountLevelShareBinV2.levels.get(lastAccountLevelShareBinV2.levels.size() - 1);
+		this.shareBinsByLevelV2 = new AccountLevelShareBin[lastLevelV2];
+		for (AccountLevelShareBin accountLevelShareBin : this.sharesByLevelV2)
+			for (int level : accountLevelShareBin.levels)
+				// level 1 stored at index 0, level 2 stored at index 1, etc.
+				// level 0 not allowed
+				this.shareBinsByLevelV2[level - 1] = accountLevelShareBin;
 
 		// Convert collections to unmodifiable form
 		this.rewardsByHeight = Collections.unmodifiableList(this.rewardsByHeight);
-		this.sharesByLevel = Collections.unmodifiableList(this.sharesByLevel);
+		this.sharesByLevelV1 = Collections.unmodifiableList(this.sharesByLevelV1);
+		this.sharesByLevelV2 = Collections.unmodifiableList(this.sharesByLevelV2);
 		this.blocksNeededByLevel = Collections.unmodifiableList(this.blocksNeededByLevel);
 		this.cumulativeBlocksByLevel = Collections.unmodifiableList(this.cumulativeBlocksByLevel);
 		this.blockTimingsByHeight = Collections.unmodifiableList(this.blockTimingsByHeight);
+		this.qoraHoldersShareByHeight = Collections.unmodifiableList(this.qoraHoldersShareByHeight);
 	}
 
 	/**
@@ -542,6 +690,7 @@ public class BlockChain {
 
 		boolean isTopOnly = Settings.getInstance().isTopOnly();
 		boolean archiveEnabled = Settings.getInstance().isArchiveEnabled();
+		boolean isLite = Settings.getInstance().isLite();
 		boolean canBootstrap = Settings.getInstance().getBootstrap();
 		boolean needsArchiveRebuild = false;
 		BlockData chainTip;
@@ -562,22 +711,44 @@ public class BlockChain {
 					}
 				}
 			}
+
+			// Validate checkpoints
+			// Limited to topOnly nodes for now, in order to reduce risk, and to solve a real-world problem with divergent topOnly nodes
+			// TODO: remove the isTopOnly conditional below once this feature has had more testing time
+			if (isTopOnly && !isLite) {
+				List<Checkpoint> checkpoints = BlockChain.getInstance().getCheckpoints();
+				for (Checkpoint checkpoint : checkpoints) {
+					BlockData blockData = repository.getBlockRepository().fromHeight(checkpoint.height);
+					if (blockData == null) {
+						// Try the archive
+						blockData = repository.getBlockArchiveRepository().fromHeight(checkpoint.height);
+					}
+					if (blockData == null) {
+						LOGGER.trace("Couldn't find block for height {}", checkpoint.height);
+						// This is likely due to the block being pruned, so is safe to ignore.
+						// Continue, as there might be other blocks we can check more definitively.
+						continue;
+					}
+
+					byte[] signature = Base58.decode(checkpoint.signature);
+					if (!Arrays.equals(signature, blockData.getSignature())) {
+						LOGGER.info("Error: block at height {} with signature {} doesn't match checkpoint sig: {}. Bootstrapping...", checkpoint.height, Base58.encode(blockData.getSignature()), checkpoint.signature);
+						needsArchiveRebuild = true;
+						break;
+					}
+					LOGGER.info("Block at height {} matches checkpoint signature", blockData.getHeight());
+				}
+			}
+
 		}
 
-		boolean hasBlocks = (chainTip != null && chainTip.getHeight() > 1);
+		// Check first block is Genesis Block
+		if (!isGenesisBlockValid() || needsArchiveRebuild) {
+			try {
+				rebuildBlockchain();
 
-		if (isTopOnly && hasBlocks) {
+			} catch (InterruptedException e) {
-			// Top-only mode is enabled and we have blocks, so it's possible that the genesis block has been pruned
+				throw new DataException(String.format("Interrupted when trying to rebuild blockchain: %s", e.getMessage()));
-			// It's best not to validate it, and there's no real need to
-		} else {
-			// Check first block is Genesis Block
-			if (!isGenesisBlockValid() || needsArchiveRebuild) {
-				try {
-					rebuildBlockchain();
-
-				} catch (InterruptedException e) {
-					throw new DataException(String.format("Interrupted when trying to rebuild blockchain: %s", e.getMessage()));
-				}
 			}
 		}
 
@@ -586,9 +757,7 @@ public class BlockChain {
 		try (final Repository repository = RepositoryManager.getRepository()) {
 			repository.checkConsistency();
 
-			// Set the number of blocks to validate based on the pruned state of the chain
+			int blocksToValidate = Math.min(Settings.getInstance().getPruneBlockLimit() - 10, 1440);
-			// If pruned, subtract an extra 10 to allow room for error
-			int blocksToValidate = (isTopOnly || archiveEnabled) ? Settings.getInstance().getPruneBlockLimit() - 10 : 1440;
 
 			int startHeight = Math.max(repository.getBlockRepository().getBlockchainHeight() - blocksToValidate, 1);
 			BlockData detachedBlockData = repository.getBlockRepository().getDetachedBlockSignature(startHeight);

src/main/java/org/qortal/block/SelfSponsorshipAlgoV1Block.java

@@ -0,0 +1,133 @@
+package org.qortal.block;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.qortal.account.SelfSponsorshipAlgoV1;
+import org.qortal.api.model.AccountPenaltyStats;
+import org.qortal.crypto.Crypto;
+import org.qortal.data.account.AccountData;
+import org.qortal.data.account.AccountPenaltyData;
+import org.qortal.repository.DataException;
+import org.qortal.repository.Repository;
+import org.qortal.utils.Base58;
+
+import java.nio.charset.StandardCharsets;
+import java.util.*;
+import java.util.stream.Collectors;
+
+/**
+ * Self Sponsorship AlgoV1 Block
+ * <p>
+ * Selected block for the initial run on the "self sponsorship detection algorithm"
+ */
+public final class SelfSponsorshipAlgoV1Block {
+
+	private static final Logger LOGGER = LogManager.getLogger(SelfSponsorshipAlgoV1Block.class);
+
+
+	private SelfSponsorshipAlgoV1Block() {
+		/* Do not instantiate */
+	}
+
+	public static void processAccountPenalties(Block block) throws DataException {
+		LOGGER.info("Running algo for block processing - this will take a while...");
+		logPenaltyStats(block.repository);
+		long startTime = System.currentTimeMillis();
+		Set<AccountPenaltyData> penalties = getAccountPenalties(block.repository, -5000000);
+		block.repository.getAccountRepository().updateBlocksMintedPenalties(penalties);
+		long totalTime = System.currentTimeMillis() - startTime;
+		String hash = getHash(penalties.stream().map(p -> p.getAddress()).collect(Collectors.toList()));
+		LOGGER.info("{} penalty addresses processed (hash: {}). Total time taken: {} seconds", penalties.size(), hash, (int)(totalTime / 1000.0f));
+		logPenaltyStats(block.repository);
+
+		int updatedCount = updateAccountLevels(block.repository, penalties);
+		LOGGER.info("Account levels updated for {} penalty addresses", updatedCount);
+	}
+
+	public static void orphanAccountPenalties(Block block) throws DataException {
+		LOGGER.info("Running algo for block orphaning - this will take a while...");
+		logPenaltyStats(block.repository);
+		long startTime = System.currentTimeMillis();
+		Set<AccountPenaltyData> penalties = getAccountPenalties(block.repository, 5000000);
+		block.repository.getAccountRepository().updateBlocksMintedPenalties(penalties);
+		long totalTime = System.currentTimeMillis() - startTime;
+		String hash = getHash(penalties.stream().map(p -> p.getAddress()).collect(Collectors.toList()));
+		LOGGER.info("{} penalty addresses orphaned (hash: {}). Total time taken: {} seconds", penalties.size(), hash, (int)(totalTime / 1000.0f));
+		logPenaltyStats(block.repository);
+
+		int updatedCount = updateAccountLevels(block.repository, penalties);
+		LOGGER.info("Account levels updated for {} penalty addresses", updatedCount);
+	}
+
+	public static Set<AccountPenaltyData> getAccountPenalties(Repository repository, int penalty) throws DataException {
+		final long snapshotTimestamp = BlockChain.getInstance().getSelfSponsorshipAlgoV1SnapshotTimestamp();
+		Set<AccountPenaltyData> penalties = new LinkedHashSet<>();
+		List<String> addresses = repository.getTransactionRepository().getConfirmedRewardShareCreatorsExcludingSelfShares();
+		for (String address : addresses) {
+			//System.out.println(String.format("address: %s", address));
+			SelfSponsorshipAlgoV1 selfSponsorshipAlgoV1 = new SelfSponsorshipAlgoV1(repository, address, snapshotTimestamp, false);
+			selfSponsorshipAlgoV1.run();
+			//System.out.println(String.format("Penalty addresses: %d", selfSponsorshipAlgoV1.getPenaltyAddresses().size()));
+
+			for (String penaltyAddress : selfSponsorshipAlgoV1.getPenaltyAddresses()) {
+				penalties.add(new AccountPenaltyData(penaltyAddress, penalty));
+			}
+		}
+		return penalties;
+	}
+
+	private static int updateAccountLevels(Repository repository, Set<AccountPenaltyData> accountPenalties) throws DataException {
+		final List<Integer> cumulativeBlocksByLevel = BlockChain.getInstance().getCumulativeBlocksByLevel();
+		final int maximumLevel = cumulativeBlocksByLevel.size() - 1;
+
+		int updatedCount = 0;
+
+		for (AccountPenaltyData penaltyData : accountPenalties) {
+			AccountData accountData = repository.getAccountRepository().getAccount(penaltyData.getAddress());
+			final int effectiveBlocksMinted = accountData.getBlocksMinted() + accountData.getBlocksMintedAdjustment() + accountData.getBlocksMintedPenalty();
+
+			// Shortcut for penalties
+			if (effectiveBlocksMinted < 0) {
+				accountData.setLevel(0);
+				repository.getAccountRepository().setLevel(accountData);
+				updatedCount++;
+				LOGGER.trace(() -> String.format("Block minter %s dropped to level %d", accountData.getAddress(), accountData.getLevel()));
+				continue;
+			}
+
+			for (int newLevel = maximumLevel; newLevel >= 0; --newLevel) {
+				if (effectiveBlocksMinted >= cumulativeBlocksByLevel.get(newLevel)) {
+					accountData.setLevel(newLevel);
+					repository.getAccountRepository().setLevel(accountData);
+					updatedCount++;
+					LOGGER.trace(() -> String.format("Block minter %s increased to level %d", accountData.getAddress(), accountData.getLevel()));
+					break;
+				}
+			}
+		}
+
+		return updatedCount;
+	}
+
+	private static void logPenaltyStats(Repository repository) {
+		try {
+			LOGGER.info(getPenaltyStats(repository));
+
+		} catch (DataException e) {}
+	}
+
+	private static AccountPenaltyStats getPenaltyStats(Repository repository) throws DataException {
+		List<AccountData> accounts = repository.getAccountRepository().getPenaltyAccounts();
+		return AccountPenaltyStats.fromAccounts(accounts);
+	}
+
+	public static String getHash(List<String> penaltyAddresses) {
+		if (penaltyAddresses == null || penaltyAddresses.isEmpty()) {
+			return null;
+		}
+		Collections.sort(penaltyAddresses);
+		return Base58.encode(Crypto.digest(StringUtils.join(penaltyAddresses).getBytes(StandardCharsets.UTF_8)));
+	}
+
+}

src/main/java/org/qortal/controller/AutoUpdate.java

@@ -15,6 +15,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.TimeoutException;
+import java.util.stream.Collectors;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -40,6 +41,7 @@ public class AutoUpdate extends Thread {
 
 	public static final String JAR_FILENAME = "qortal.jar";
 	public static final String NEW_JAR_FILENAME = "new-" + JAR_FILENAME;
+	public static final String AGENTLIB_JVM_HOLDER_ARG = "-DQORTAL_agentlib=";
 
 	private static final Logger LOGGER = LogManager.getLogger(AutoUpdate.class);
 	private static final long CHECK_INTERVAL = 20 * 60 * 1000L; // ms
@@ -243,6 +245,11 @@ public class AutoUpdate extends Thread {
 			// JVM arguments
 			javaCmd.addAll(ManagementFactory.getRuntimeMXBean().getInputArguments());
 
+			// Disable, but retain, any -agentlib JVM arg as sub-process might fail if it tries to reuse same port
+			javaCmd = javaCmd.stream()
+					.map(arg -> arg.replace("-agentlib", AGENTLIB_JVM_HOLDER_ARG))
+					.collect(Collectors.toList());
+
 			// Remove JNI options as they won't be supported by command-line 'java'
 			// These are typically added by the AdvancedInstaller Java launcher EXE
 			javaCmd.removeAll(Arrays.asList("abort", "exit", "vfprintf"));
@@ -261,10 +268,19 @@ public class AutoUpdate extends Thread {
 					Translator.INSTANCE.translate("SysTray", "APPLYING_UPDATE_AND_RESTARTING"),
 					MessageType.INFO);
 
-			new ProcessBuilder(javaCmd).start();
+			ProcessBuilder processBuilder = new ProcessBuilder(javaCmd);
+
+			// New process will inherit our stdout and stderr
+			processBuilder.redirectOutput(ProcessBuilder.Redirect.INHERIT);
+			processBuilder.redirectError(ProcessBuilder.Redirect.INHERIT);
+
+			Process process = processBuilder.start();
+
+			// Nothing to pipe to new process, so close output stream (process's stdin)
+			process.getOutputStream().close();
 
 			return true; // applying update OK
-		} catch (IOException e) {
+		} catch (Exception e) {
 			LOGGER.error(String.format("Failed to apply update: %s", e.getMessage()));
 
 			try {

src/main/java/org/qortal/controller/BlockMinter.java

@@ -35,6 +35,8 @@ import org.qortal.transaction.Transaction;
 import org.qortal.utils.Base58;
 import org.qortal.utils.NTP;
 
+import static org.junit.Assert.assertNotNull;
+
 // Minting new blocks
 
 public class BlockMinter extends Thread {
@@ -61,13 +63,12 @@ public class BlockMinter extends Thread {
 	public void run() {
 		Thread.currentThread().setName("BlockMinter");
 
-		if (Settings.getInstance().isLite()) {
+		if (Settings.getInstance().isTopOnly() || Settings.getInstance().isLite()) {
-			// Lite nodes do not mint
+			// Top only and lite nodes do not sign blocks
 			return;
 		}
-
+		if (Settings.getInstance().getWipeUnconfirmedOnStart()) {
-		try (final Repository repository = RepositoryManager.getRepository()) {
+			try (final Repository repository = RepositoryManager.getRepository()) {
-			if (Settings.getInstance().getWipeUnconfirmedOnStart()) {
 				// Wipe existing unconfirmed transactions
 				List<TransactionData> unconfirmedTransactions = repository.getTransactionRepository().getUnconfirmedTransactions();
 
@@ -77,356 +78,377 @@ public class BlockMinter extends Thread {
 				}
 
 				repository.saveChanges();
+			} catch (DataException e) {
+				LOGGER.warn("Repository issue trying to wipe unconfirmed transactions on start-up: {}", e.getMessage());
+				// Fall-through to normal behaviour in case we can recover
 			}
+		}
 
+		BlockData previousBlockData = null;
+
+		// Vars to keep track of blocks that were skipped due to chain weight
+		byte[] parentSignatureForLastLowWeightBlock = null;
+		Long timeOfLastLowWeightBlock = null;
+
+		List<Block> newBlocks = new ArrayList<>();
+
+		final boolean isSingleNodeTestnet = Settings.getInstance().isSingleNodeTestnet();
+
+		try (final Repository repository = RepositoryManager.getRepository()) {
 			// Going to need this a lot...
 			BlockRepository blockRepository = repository.getBlockRepository();
-			BlockData previousBlockData = null;
-
-			// Vars to keep track of blocks that were skipped due to chain weight
-			byte[] parentSignatureForLastLowWeightBlock = null;
-			Long timeOfLastLowWeightBlock = null;
-
-			List<Block> newBlocks = new ArrayList<>();
 
 			// Flags for tracking change in whether minting is possible,
 			// so we can notify Controller, and further update SysTray, etc.
 			boolean isMintingPossible = false;
 			boolean wasMintingPossible = isMintingPossible;
 			while (running) {
-				repository.discardChanges(); // Free repository locks, if any
-
 				if (isMintingPossible != wasMintingPossible)
 					Controller.getInstance().onMintingPossibleChange(isMintingPossible);
 
 				wasMintingPossible = isMintingPossible;
 
-				// Sleep for a while
-				Thread.sleep(1000);
-
-				isMintingPossible = false;
-
-				final Long now = NTP.getTime();
-				if (now == null)
-					continue;
-
-				final Long minLatestBlockTimestamp = Controller.getMinimumLatestBlockTimestamp();
-				if (minLatestBlockTimestamp == null)
-					continue;
-
-				// No online accounts? (e.g. during startup)
-				if (OnlineAccountsManager.getInstance().getOnlineAccounts().isEmpty())
-					continue;
-
-				List<MintingAccountData> mintingAccountsData = repository.getAccountRepository().getMintingAccounts();
-				// No minting accounts?
-				if (mintingAccountsData.isEmpty())
-					continue;
-
-				// Disregard minting accounts that are no longer valid, e.g. by transfer/loss of founder flag or account level
-				// Note that minting accounts are actually reward-shares in Qortal
-				Iterator<MintingAccountData> madi = mintingAccountsData.iterator();
-				while (madi.hasNext()) {
-					MintingAccountData mintingAccountData = madi.next();
-
-					RewardShareData rewardShareData = repository.getAccountRepository().getRewardShare(mintingAccountData.getPublicKey());
-					if (rewardShareData == null) {
-						// Reward-share doesn't exist - probably cancelled but not yet removed from node's list of minting accounts
-						madi.remove();
-						continue;
-					}
-
-					Account mintingAccount = new Account(repository, rewardShareData.getMinter());
-					if (!mintingAccount.canMint()) {
-						// Minting-account component of reward-share can no longer mint - disregard
-						madi.remove();
-						continue;
-					}
-
-					// Optional (non-validated) prevention of block submissions below a defined level.
-					// This is an unvalidated version of Blockchain.minAccountLevelToMint
-					// and exists only to reduce block candidates by default.
-					int level = mintingAccount.getEffectiveMintingLevel();
-					if (level < BlockChain.getInstance().getMinAccountLevelForBlockSubmissions()) {
-						madi.remove();
-						continue;
-					}
-				}
-
-				// Needs a mutable copy of the unmodifiableList
-				List<Peer> peers = new ArrayList<>(Network.getInstance().getImmutableHandshakedPeers());
-				BlockData lastBlockData = blockRepository.getLastBlock();
-
-				// Disregard peers that have "misbehaved" recently
-				peers.removeIf(Controller.hasMisbehaved);
-
-				// Disregard peers that don't have a recent block, but only if we're not in recovery mode.
-				// In that mode, we want to allow minting on top of older blocks, to recover stalled networks.
-				if (Synchronizer.getInstance().getRecoveryMode() == false)
-					peers.removeIf(Controller.hasNoRecentBlock);
-
-				// Don't mint if we don't have enough up-to-date peers as where would the transactions/consensus come from?
-				if (peers.size() < Settings.getInstance().getMinBlockchainPeers())
-					continue;
-
-				// If we are stuck on an invalid block, we should allow an alternative to be minted
-				boolean recoverInvalidBlock = false;
-				if (Synchronizer.getInstance().timeInvalidBlockLastReceived != null) {
-					// We've had at least one invalid block
-					long timeSinceLastValidBlock = NTP.getTime() - Synchronizer.getInstance().timeValidBlockLastReceived;
-					long timeSinceLastInvalidBlock = NTP.getTime() - Synchronizer.getInstance().timeInvalidBlockLastReceived;
-					if (timeSinceLastValidBlock > INVALID_BLOCK_RECOVERY_TIMEOUT) {
-						if (timeSinceLastInvalidBlock < INVALID_BLOCK_RECOVERY_TIMEOUT) {
-							// Last valid block was more than 10 mins ago, but we've had an invalid block since then
-							// Assume that the chain has stalled because there is no alternative valid candidate
-							// Enter recovery mode to allow alternative, valid candidates to be minted
-							recoverInvalidBlock = true;
-						}
-					}
-				}
-
-				// If our latest block isn't recent then we need to synchronize instead of minting, unless we're in recovery mode.
-				if (!peers.isEmpty() && lastBlockData.getTimestamp() < minLatestBlockTimestamp)
-					if (Synchronizer.getInstance().getRecoveryMode() == false && recoverInvalidBlock == false)
-						continue;
-
-				// There are enough peers with a recent block and our latest block is recent
-				// so go ahead and mint a block if possible.
-				isMintingPossible = true;
-
-				// Check blockchain hasn't changed
-				if (previousBlockData == null || !Arrays.equals(previousBlockData.getSignature(), lastBlockData.getSignature())) {
-					previousBlockData = lastBlockData;
-					newBlocks.clear();
-
-					// Reduce log timeout
-					logTimeout = 10 * 1000L;
-
-					// Last low weight block is no longer valid
-					parentSignatureForLastLowWeightBlock = null;
-				}
-
-				// Discard accounts we have already built blocks with
-				mintingAccountsData.removeIf(mintingAccountData -> newBlocks.stream().anyMatch(newBlock -> Arrays.equals(newBlock.getBlockData().getMinterPublicKey(), mintingAccountData.getPublicKey())));
-
-				// Do we need to build any potential new blocks?
-				List<PrivateKeyAccount> newBlocksMintingAccounts = mintingAccountsData.stream().map(accountData -> new PrivateKeyAccount(repository, accountData.getPrivateKey())).collect(Collectors.toList());
-
-				// We might need to sit the next block out, if one of our minting accounts signed the previous one
-				final byte[] previousBlockMinter = previousBlockData.getMinterPublicKey();
-				final boolean mintedLastBlock = mintingAccountsData.stream().anyMatch(mintingAccount -> Arrays.equals(mintingAccount.getPublicKey(), previousBlockMinter));
-				if (mintedLastBlock) {
-					LOGGER.trace(String.format("One of our keys signed the last block, so we won't sign the next one"));
-					continue;
-				}
-
-				if (parentSignatureForLastLowWeightBlock != null) {
-					// The last iteration found a higher weight block in the network, so sleep for a while
-					// to allow is to sync the higher weight chain. We are sleeping here rather than when
-					// detected as we don't want to hold the blockchain lock open.
-					LOGGER.debug("Sleeping for 10 seconds...");
-					Thread.sleep(10 * 1000L);
-				}
-
-				for (PrivateKeyAccount mintingAccount : newBlocksMintingAccounts) {
-					// First block does the AT heavy-lifting
-					if (newBlocks.isEmpty()) {
-						Block newBlock = Block.mint(repository, previousBlockData, mintingAccount);
-						if (newBlock == null) {
-							// For some reason we can't mint right now
-							moderatedLog(() -> LOGGER.error("Couldn't build a to-be-minted block"));
-							continue;
-						}
-
-						newBlocks.add(newBlock);
-					} else {
-						// The blocks for other minters require less effort...
-						Block newBlock = newBlocks.get(0).remint(mintingAccount);
-						if (newBlock == null) {
-							// For some reason we can't mint right now
-							moderatedLog(() -> LOGGER.error("Couldn't rebuild a to-be-minted block"));
-							continue;
-						}
-
-						newBlocks.add(newBlock);
-					}
-				}
-
-				// No potential block candidates?
-				if (newBlocks.isEmpty())
-					continue;
-
-				// Make sure we're the only thread modifying the blockchain
-				ReentrantLock blockchainLock = Controller.getInstance().getBlockchainLock();
-				if (!blockchainLock.tryLock(30, TimeUnit.SECONDS)) {
-					LOGGER.debug("Couldn't acquire blockchain lock even after waiting 30 seconds");
-					continue;
-				}
-
-				boolean newBlockMinted = false;
-				Block newBlock = null;
-
 				try {
-					// Clear repository session state so we have latest view of data
+					// Free up any repository locks
 					repository.discardChanges();
 
-					// Now that we have blockchain lock, do final check that chain hasn't changed
+					// Sleep for a while.
-					BlockData latestBlockData = blockRepository.getLastBlock();
+					// It's faster on single node testnets, to allow lots of blocks to be minted quickly.
-					if (!Arrays.equals(lastBlockData.getSignature(), latestBlockData.getSignature()))
+					Thread.sleep(isSingleNodeTestnet ? 50 : 1000);
+
+					isMintingPossible = false;
+
+					final Long now = NTP.getTime();
+					if (now == null)
 						continue;
 
-					List<Block> goodBlocks = new ArrayList<>();
+					final Long minLatestBlockTimestamp = Controller.getMinimumLatestBlockTimestamp();
-					for (Block testBlock : newBlocks) {
+					if (minLatestBlockTimestamp == null)
-						// Is new block's timestamp valid yet?
+						continue;
-						// We do a separate check as some timestamp checks are skipped for testchains
-						if (testBlock.isTimestampValid() != ValidationResult.OK)
-							continue;
 
-						testBlock.preProcess();
+					// No online accounts for current timestamp? (e.g. during startup)
+					if (!OnlineAccountsManager.getInstance().hasOnlineAccounts())
+						continue;
 
-						// Is new block valid yet? (Before adding unconfirmed transactions)
+					List<MintingAccountData> mintingAccountsData = repository.getAccountRepository().getMintingAccounts();
-						ValidationResult result = testBlock.isValid();
+					// No minting accounts?
-						if (result != ValidationResult.OK) {
+					if (mintingAccountsData.isEmpty())
-							moderatedLog(() -> LOGGER.error(String.format("To-be-minted block invalid '%s' before adding transactions?", result.name())));
+						continue;
 
+					// Disregard minting accounts that are no longer valid, e.g. by transfer/loss of founder flag or account level
+					// Note that minting accounts are actually reward-shares in Qortal
+					Iterator<MintingAccountData> madi = mintingAccountsData.iterator();
+					while (madi.hasNext()) {
+						MintingAccountData mintingAccountData = madi.next();
+
+						RewardShareData rewardShareData = repository.getAccountRepository().getRewardShare(mintingAccountData.getPublicKey());
+						if (rewardShareData == null) {
+							// Reward-share doesn't exist - probably cancelled but not yet removed from node's list of minting accounts
+							madi.remove();
 							continue;
 						}
 
-						goodBlocks.add(testBlock);
+						Account mintingAccount = new Account(repository, rewardShareData.getMinter());
-					}
+						if (!mintingAccount.canMint()) {
+							// Minting-account component of reward-share can no longer mint - disregard
+							madi.remove();
+							continue;
+						}
 
-					if (goodBlocks.isEmpty())
+						// Optional (non-validated) prevention of block submissions below a defined level.
-						continue;
+						// This is an unvalidated version of Blockchain.minAccountLevelToMint
-
+						// and exists only to reduce block candidates by default.
-					// Pick best block
+						int level = mintingAccount.getEffectiveMintingLevel();
-					final int parentHeight = previousBlockData.getHeight();
+						if (level < BlockChain.getInstance().getMinAccountLevelForBlockSubmissions()) {
-					final byte[] parentBlockSignature = previousBlockData.getSignature();
+							madi.remove();
-
+							continue;
-					BigInteger bestWeight = null;
-
-					for (int bi = 0; bi < goodBlocks.size(); ++bi) {
-						BlockData blockData = goodBlocks.get(bi).getBlockData();
-
-						BlockSummaryData blockSummaryData = new BlockSummaryData(blockData);
-						int minterLevel = Account.getRewardShareEffectiveMintingLevel(repository, blockData.getMinterPublicKey());
-						blockSummaryData.setMinterLevel(minterLevel);
-
-						BigInteger blockWeight = Block.calcBlockWeight(parentHeight, parentBlockSignature, blockSummaryData);
-
-						if (bestWeight == null || blockWeight.compareTo(bestWeight) < 0) {
-							newBlock = goodBlocks.get(bi);
-							bestWeight = blockWeight;
 						}
 					}
 
-					try {
+					// Needs a mutable copy of the unmodifiableList
-						if (this.higherWeightChainExists(repository, bestWeight)) {
+					List<Peer> peers = new ArrayList<>(Network.getInstance().getImmutableHandshakedPeers());
+					BlockData lastBlockData = blockRepository.getLastBlock();
 
-							// Check if the base block has updated since the last time we were here
+					// Disregard peers that have "misbehaved" recently
-							if (parentSignatureForLastLowWeightBlock == null || timeOfLastLowWeightBlock == null ||
+					peers.removeIf(Controller.hasMisbehaved);
-									!Arrays.equals(parentSignatureForLastLowWeightBlock, previousBlockData.getSignature())) {
+
-								// We've switched to a different chain, so reset the timer
+					// Disregard peers that don't have a recent block, but only if we're not in recovery mode.
-								timeOfLastLowWeightBlock = NTP.getTime();
+					// In that mode, we want to allow minting on top of older blocks, to recover stalled networks.
+					if (Synchronizer.getInstance().getRecoveryMode() == false)
+						peers.removeIf(Controller.hasNoRecentBlock);
+
+					// Don't mint if we don't have enough up-to-date peers as where would the transactions/consensus come from?
+					if (peers.size() < Settings.getInstance().getMinBlockchainPeers())
+						continue;
+
+					// If we are stuck on an invalid block, we should allow an alternative to be minted
+					boolean recoverInvalidBlock = false;
+					if (Synchronizer.getInstance().timeInvalidBlockLastReceived != null) {
+						// We've had at least one invalid block
+						long timeSinceLastValidBlock = NTP.getTime() - Synchronizer.getInstance().timeValidBlockLastReceived;
+						long timeSinceLastInvalidBlock = NTP.getTime() - Synchronizer.getInstance().timeInvalidBlockLastReceived;
+						if (timeSinceLastValidBlock > INVALID_BLOCK_RECOVERY_TIMEOUT) {
+							if (timeSinceLastInvalidBlock < INVALID_BLOCK_RECOVERY_TIMEOUT) {
+								// Last valid block was more than 10 mins ago, but we've had an invalid block since then
+								// Assume that the chain has stalled because there is no alternative valid candidate
+								// Enter recovery mode to allow alternative, valid candidates to be minted
+								recoverInvalidBlock = true;
 							}
-							parentSignatureForLastLowWeightBlock = previousBlockData.getSignature();
+						}
+					}
 
-							// If less than 30 seconds has passed since first detection the higher weight chain,
+					// If our latest block isn't recent then we need to synchronize instead of minting, unless we're in recovery mode.
-							// we should skip our block submission to give us the opportunity to sync to the better chain
+					if (!peers.isEmpty() && lastBlockData.getTimestamp() < minLatestBlockTimestamp)
-							if (NTP.getTime() - timeOfLastLowWeightBlock < 30*1000L) {
+						if (Synchronizer.getInstance().getRecoveryMode() == false && recoverInvalidBlock == false)
-								LOGGER.debug("Higher weight chain found in peers, so not signing a block this round");
+							continue;
-								LOGGER.debug("Time since detected: {}ms", NTP.getTime() - timeOfLastLowWeightBlock);
+
+					// There are enough peers with a recent block and our latest block is recent
+					// so go ahead and mint a block if possible.
+					isMintingPossible = true;
+
+					// Check blockchain hasn't changed
+					if (previousBlockData == null || !Arrays.equals(previousBlockData.getSignature(), lastBlockData.getSignature())) {
+						previousBlockData = lastBlockData;
+						newBlocks.clear();
+
+						// Reduce log timeout
+						logTimeout = 10 * 1000L;
+
+						// Last low weight block is no longer valid
+						parentSignatureForLastLowWeightBlock = null;
+					}
+
+					// Discard accounts we have already built blocks with
+					mintingAccountsData.removeIf(mintingAccountData -> newBlocks.stream().anyMatch(newBlock -> Arrays.equals(newBlock.getBlockData().getMinterPublicKey(), mintingAccountData.getPublicKey())));
+
+					// Do we need to build any potential new blocks?
+					List<PrivateKeyAccount> newBlocksMintingAccounts = mintingAccountsData.stream().map(accountData -> new PrivateKeyAccount(repository, accountData.getPrivateKey())).collect(Collectors.toList());
+
+					// We might need to sit the next block out, if one of our minting accounts signed the previous one
+					// Skip this check for single node testnets, since they definitely need to mint every block
+					byte[] previousBlockMinter = previousBlockData.getMinterPublicKey();
+					boolean mintedLastBlock = mintingAccountsData.stream().anyMatch(mintingAccount -> Arrays.equals(mintingAccount.getPublicKey(), previousBlockMinter));
+					if (mintedLastBlock && !isSingleNodeTestnet) {
+						LOGGER.trace(String.format("One of our keys signed the last block, so we won't sign the next one"));
+						continue;
+					}
+
+					if (parentSignatureForLastLowWeightBlock != null) {
+						// The last iteration found a higher weight block in the network, so sleep for a while
+						// to allow is to sync the higher weight chain. We are sleeping here rather than when
+						// detected as we don't want to hold the blockchain lock open.
+						LOGGER.info("Sleeping for 10 seconds...");
+						Thread.sleep(10 * 1000L);
+					}
+
+					for (PrivateKeyAccount mintingAccount : newBlocksMintingAccounts) {
+						// First block does the AT heavy-lifting
+						if (newBlocks.isEmpty()) {
+							Block newBlock = Block.mint(repository, previousBlockData, mintingAccount);
+							if (newBlock == null) {
+								// For some reason we can't mint right now
+								moderatedLog(() -> LOGGER.info("Couldn't build a to-be-minted block"));
 								continue;
 							}
-							else {
+
-								// More than 30 seconds have passed, so we should submit our block candidate anyway.
+							newBlocks.add(newBlock);
-								LOGGER.debug("More than 30 seconds passed, so proceeding to submit block candidate...");
+						} else {
+							// The blocks for other minters require less effort...
+							Block newBlock = newBlocks.get(0).remint(mintingAccount);
+							if (newBlock == null) {
+								// For some reason we can't mint right now
+								moderatedLog(() -> LOGGER.error("Couldn't rebuild a to-be-minted block"));
+								continue;
 							}
+
+							newBlocks.add(newBlock);
 						}
-						else {
-							LOGGER.debug("No higher weight chain found in peers");
-						}
-					} catch (DataException e) {
-						LOGGER.debug("Unable to check for a higher weight chain. Proceeding anyway...");
 					}
 
-					// Discard any uncommitted changes as a result of the higher weight chain detection
+					// No potential block candidates?
-					repository.discardChanges();
+					if (newBlocks.isEmpty())
+						continue;
 
-					// Clear variables that track low weight blocks
+					// Make sure we're the only thread modifying the blockchain
-					parentSignatureForLastLowWeightBlock = null;
+					ReentrantLock blockchainLock = Controller.getInstance().getBlockchainLock();
-					timeOfLastLowWeightBlock = null;
+					if (!blockchainLock.tryLock(30, TimeUnit.SECONDS)) {
-
+						LOGGER.debug("Couldn't acquire blockchain lock even after waiting 30 seconds");
-
-					// Add unconfirmed transactions
-					addUnconfirmedTransactions(repository, newBlock);
-
-					// Sign to create block's signature
-					newBlock.sign();
-
-					// Is newBlock still valid?
-					ValidationResult validationResult = newBlock.isValid();
-					if (validationResult != ValidationResult.OK) {
-						// No longer valid? Report and discard
-						LOGGER.error(String.format("To-be-minted block now invalid '%s' after adding unconfirmed transactions?", validationResult.name()));
-
-						// Rebuild block candidates, just to be sure
-						newBlocks.clear();
 						continue;
 					}
 
-					// Add to blockchain - something else will notice and broadcast new block to network
+					boolean newBlockMinted = false;
+					Block newBlock = null;
+
 					try {
-						newBlock.process();
+						// Clear repository session state so we have latest view of data
+						repository.discardChanges();
 
-						repository.saveChanges();
+						// Now that we have blockchain lock, do final check that chain hasn't changed
+						BlockData latestBlockData = blockRepository.getLastBlock();
+						if (!Arrays.equals(lastBlockData.getSignature(), latestBlockData.getSignature()))
+							continue;
 
-						LOGGER.info(String.format("Minted new block: %d", newBlock.getBlockData().getHeight()));
+						List<Block> goodBlocks = new ArrayList<>();
+						boolean wasInvalidBlockDiscarded = false;
+						Iterator<Block> newBlocksIterator = newBlocks.iterator();
 
-						RewardShareData rewardShareData = repository.getAccountRepository().getRewardShare(newBlock.getBlockData().getMinterPublicKey());
+						while (newBlocksIterator.hasNext()) {
+							Block testBlock = newBlocksIterator.next();
 
-						if (rewardShareData != null) {
+							// Is new block's timestamp valid yet?
-							LOGGER.info(String.format("Minted block %d, sig %.8s, parent sig: %.8s by %s on behalf of %s",
+							// We do a separate check as some timestamp checks are skipped for testchains
-									newBlock.getBlockData().getHeight(),
+							if (testBlock.isTimestampValid() != ValidationResult.OK)
-									Base58.encode(newBlock.getBlockData().getSignature()),
+								continue;
-									Base58.encode(newBlock.getParent().getSignature()),
+
-									rewardShareData.getMinter(),
+							testBlock.preProcess();
-									rewardShareData.getRecipient()));
+
-						} else {
+							// Is new block valid yet? (Before adding unconfirmed transactions)
-							LOGGER.info(String.format("Minted block %d, sig %.8s, parent sig: %.8s by %s",
+							ValidationResult result = testBlock.isValid();
-									newBlock.getBlockData().getHeight(),
+							if (result != ValidationResult.OK) {
-									Base58.encode(newBlock.getBlockData().getSignature()),
+								moderatedLog(() -> LOGGER.error(String.format("To-be-minted block invalid '%s' before adding transactions?", result.name())));
-									Base58.encode(newBlock.getParent().getSignature()),
+
-									newBlock.getMinter().getAddress()));
+								newBlocksIterator.remove();
+								wasInvalidBlockDiscarded = true;
+								/*
+								 * Bail out fast so that we loop around from the top again.
+								 * This gives BlockMinter the possibility to remint this candidate block using another block from newBlocks,
+								 * via the Blocks.remint() method, which avoids having to re-process Block ATs all over again.
+								 * Particularly useful if some aspect of Blocks changes due a timestamp-based feature-trigger (see BlockChain class).
+								 */
+								break;
+							}
+
+							goodBlocks.add(testBlock);
 						}
 
-						// Notify network after we're released blockchain lock
+						if (wasInvalidBlockDiscarded || goodBlocks.isEmpty())
-						newBlockMinted = true;
+							continue;
 
-						// Notify Controller
+						// Pick best block
-						repository.discardChanges(); // clear transaction status to prevent deadlocks
+						final int parentHeight = previousBlockData.getHeight();
-						Controller.getInstance().onNewBlock(newBlock.getBlockData());
+						final byte[] parentBlockSignature = previousBlockData.getSignature();
-					} catch (DataException e) {
+
-						// Unable to process block - report and discard
+						BigInteger bestWeight = null;
-						LOGGER.error("Unable to process newly minted block?", e);
+
-						newBlocks.clear();
+						for (int bi = 0; bi < goodBlocks.size(); ++bi) {
+							BlockData blockData = goodBlocks.get(bi).getBlockData();
+
+							BlockSummaryData blockSummaryData = new BlockSummaryData(blockData);
+							int minterLevel = Account.getRewardShareEffectiveMintingLevel(repository, blockData.getMinterPublicKey());
+							blockSummaryData.setMinterLevel(minterLevel);
+
+							BigInteger blockWeight = Block.calcBlockWeight(parentHeight, parentBlockSignature, blockSummaryData);
+
+							if (bestWeight == null || blockWeight.compareTo(bestWeight) < 0) {
+								newBlock = goodBlocks.get(bi);
+								bestWeight = blockWeight;
+							}
+						}
+
+						try {
+							if (this.higherWeightChainExists(repository, bestWeight)) {
+
+								// Check if the base block has updated since the last time we were here
+								if (parentSignatureForLastLowWeightBlock == null || timeOfLastLowWeightBlock == null ||
+										!Arrays.equals(parentSignatureForLastLowWeightBlock, previousBlockData.getSignature())) {
+									// We've switched to a different chain, so reset the timer
+									timeOfLastLowWeightBlock = NTP.getTime();
+								}
+								parentSignatureForLastLowWeightBlock = previousBlockData.getSignature();
+
+								// If less than 30 seconds has passed since first detection the higher weight chain,
+								// we should skip our block submission to give us the opportunity to sync to the better chain
+								if (NTP.getTime() - timeOfLastLowWeightBlock < 30 * 1000L) {
+									LOGGER.info("Higher weight chain found in peers, so not signing a block this round");
+									LOGGER.info("Time since detected: {}", NTP.getTime() - timeOfLastLowWeightBlock);
+									continue;
+								} else {
+									// More than 30 seconds have passed, so we should submit our block candidate anyway.
+									LOGGER.info("More than 30 seconds passed, so proceeding to submit block candidate...");
+								}
+							} else {
+								LOGGER.debug("No higher weight chain found in peers");
+							}
+						} catch (DataException e) {
+							LOGGER.debug("Unable to check for a higher weight chain. Proceeding anyway...");
+						}
+
+						// Discard any uncommitted changes as a result of the higher weight chain detection
+						repository.discardChanges();
+
+						// Clear variables that track low weight blocks
+						parentSignatureForLastLowWeightBlock = null;
+						timeOfLastLowWeightBlock = null;
+
+						// Add unconfirmed transactions
+						addUnconfirmedTransactions(repository, newBlock);
+
+						// Sign to create block's signature
+						newBlock.sign();
+
+						// Is newBlock still valid?
+						ValidationResult validationResult = newBlock.isValid();
+						if (validationResult != ValidationResult.OK) {
+							// No longer valid? Report and discard
+							LOGGER.error(String.format("To-be-minted block now invalid '%s' after adding unconfirmed transactions?", validationResult.name()));
+
+							// Rebuild block candidates, just to be sure
+							newBlocks.clear();
+							continue;
+						}
+
+						// Add to blockchain - something else will notice and broadcast new block to network
+						try {
+							newBlock.process();
+
+							repository.saveChanges();
+
+							LOGGER.info(String.format("Minted new block: %d", newBlock.getBlockData().getHeight()));
+
+							RewardShareData rewardShareData = repository.getAccountRepository().getRewardShare(newBlock.getBlockData().getMinterPublicKey());
+
+							if (rewardShareData != null) {
+								LOGGER.info(String.format("Minted block %d, sig %.8s, parent sig: %.8s by %s on behalf of %s",
+										newBlock.getBlockData().getHeight(),
+										Base58.encode(newBlock.getBlockData().getSignature()),
+										Base58.encode(newBlock.getParent().getSignature()),
+										rewardShareData.getMinter(),
+										rewardShareData.getRecipient()));
+							} else {
+								LOGGER.info(String.format("Minted block %d, sig %.8s, parent sig: %.8s by %s",
+										newBlock.getBlockData().getHeight(),
+										Base58.encode(newBlock.getBlockData().getSignature()),
+										Base58.encode(newBlock.getParent().getSignature()),
+										newBlock.getMinter().getAddress()));
+							}
+
+							// Notify network after we're released blockchain lock
+							newBlockMinted = true;
+
+							// Notify Controller
+							repository.discardChanges(); // clear transaction status to prevent deadlocks
+							Controller.getInstance().onNewBlock(newBlock.getBlockData());
+						} catch (DataException e) {
+							// Unable to process block - report and discard
+							LOGGER.error("Unable to process newly minted block?", e);
+							newBlocks.clear();
+						}
+					} finally {
+						blockchainLock.unlock();
 					}
-				} finally {
-					blockchainLock.unlock();
-				}
 
-				if (newBlockMinted) {
+					if (newBlockMinted) {
-					// Broadcast our new chain to network
+						// Broadcast our new chain to network
-					BlockData newBlockData = newBlock.getBlockData();
+						Network.getInstance().broadcastOurChain();
+					}
 
-					Network network = Network.getInstance();
+				} catch (InterruptedException e) {
-					network.broadcast(broadcastPeer -> network.buildHeightMessage(broadcastPeer, newBlockData));
+					// We've been interrupted - time to exit
+					return;
 				}
 			}
 		} catch (DataException e) {
-			LOGGER.warn("Repository issue while running block minter", e);
+			LOGGER.warn("Repository issue while running block minter - NO LONGER MINTING", e);
-		} catch (InterruptedException e) {
-			// We've been interrupted - time to exit
-			return;
 		}
 	}
 
@@ -488,6 +510,21 @@ public class BlockMinter extends Thread {
 
 		PrivateKeyAccount mintingAccount = mintingAndOnlineAccounts[0];
 
+		Block block = mintTestingBlockRetainingTimestamps(repository, mintingAccount);
+		assertNotNull("Minted block must not be null", block);
+
+		return block;
+	}
+
+	public static Block mintTestingBlockUnvalidated(Repository repository, PrivateKeyAccount... mintingAndOnlineAccounts) throws DataException {
+		if (!BlockChain.getInstance().isTestChain())
+			throw new DataException("Ignoring attempt to mint testing block for non-test chain!");
+
+		// Ensure mintingAccount is 'online' so blocks can be minted
+		OnlineAccountsManager.getInstance().ensureTestingAccountsOnline(mintingAndOnlineAccounts);
+
+		PrivateKeyAccount mintingAccount = mintingAndOnlineAccounts[0];
+
 		return mintTestingBlockRetainingTimestamps(repository, mintingAccount);
 	}
 
@@ -495,6 +532,8 @@ public class BlockMinter extends Thread {
 		BlockData previousBlockData = repository.getBlockRepository().getLastBlock();
 
 		Block newBlock = Block.mint(repository, previousBlockData, mintingAccount);
+		if (newBlock == null)
+			return null;
 
 		// Make sure we're the only thread modifying the blockchain
 		ReentrantLock blockchainLock = Controller.getInstance().getBlockchainLock();
@@ -557,18 +596,23 @@ public class BlockMinter extends Thread {
 				// This peer has common block data
 				CommonBlockData commonBlockData = peer.getCommonBlockData();
 				BlockSummaryData commonBlockSummaryData = commonBlockData.getCommonBlockSummary();
-				if (commonBlockData.getChainWeight() != null) {
+				if (commonBlockData.getChainWeight() != null && peer.getCommonBlockData().getBlockSummariesAfterCommonBlock() != null) {
 					// The synchronizer has calculated this peer's chain weight
-					BigInteger ourChainWeightSinceCommonBlock = this.getOurChainWeightSinceBlock(repository, commonBlockSummaryData, commonBlockData.getBlockSummariesAfterCommonBlock());
+					if (!Synchronizer.getInstance().containsInvalidBlockSummary(peer.getCommonBlockData().getBlockSummariesAfterCommonBlock())) {
-					BigInteger ourChainWeight = ourChainWeightSinceCommonBlock.add(blockCandidateWeight);
+						// .. and it doesn't hold any invalid blocks
-					BigInteger peerChainWeight = commonBlockData.getChainWeight();
+						BigInteger ourChainWeightSinceCommonBlock = this.getOurChainWeightSinceBlock(repository, commonBlockSummaryData, commonBlockData.getBlockSummariesAfterCommonBlock());
-					if (peerChainWeight.compareTo(ourChainWeight) >= 0) {
+						BigInteger ourChainWeight = ourChainWeightSinceCommonBlock.add(blockCandidateWeight);
-						// This peer has a higher weight chain than ours
+						BigInteger peerChainWeight = commonBlockData.getChainWeight();
-						LOGGER.debug("Peer {} is on a higher weight chain ({}) than ours ({})", peer, formatter.format(peerChainWeight), formatter.format(ourChainWeight));
+						if (peerChainWeight.compareTo(ourChainWeight) >= 0) {
-						return true;
+							// This peer has a higher weight chain than ours
+							LOGGER.info("Peer {} is on a higher weight chain ({}) than ours ({})", peer, formatter.format(peerChainWeight), formatter.format(ourChainWeight));
+							return true;
 
+						} else {
+							LOGGER.debug("Peer {} is on a lower weight chain ({}) than ours ({})", peer, formatter.format(peerChainWeight), formatter.format(ourChainWeight));
+						}
 					} else {
-						LOGGER.debug("Peer {} is on a lower weight chain ({}) than ours ({})", peer, formatter.format(peerChainWeight), formatter.format(ourChainWeight));
+						LOGGER.debug("Peer {} has an invalid block", peer);
 					}
 				} else {
 					LOGGER.debug("Peer {} has no chain weight", peer);

src/main/java/org/qortal/controller/Controller.java

@@ -29,6 +29,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
 import org.bouncycastle.jsse.provider.BouncyCastleJsseProvider;
+import org.qortal.account.Account;
 import org.qortal.api.ApiService;
 import org.qortal.api.DomainMapService;
 import org.qortal.api.GatewayService;
@@ -45,7 +46,6 @@ import org.qortal.data.account.AccountData;
 import org.qortal.data.block.BlockData;
 import org.qortal.data.block.BlockSummaryData;
 import org.qortal.data.naming.NameData;
-import org.qortal.data.network.PeerChainTipData;
 import org.qortal.data.network.PeerData;
 import org.qortal.data.transaction.ChatTransactionData;
 import org.qortal.data.transaction.TransactionData;
@@ -113,6 +113,7 @@ public class Controller extends Thread {
 	private long repositoryBackupTimestamp = startTime; // ms
 	private long repositoryMaintenanceTimestamp = startTime; // ms
 	private long repositoryCheckpointTimestamp = startTime; // ms
+	private long prunePeersTimestamp = startTime; // ms
 	private long ntpCheckTimestamp = startTime; // ms
 	private long deleteExpiredTimestamp = startTime + DELETE_EXPIRED_INTERVAL; // ms
 
@@ -316,6 +317,10 @@ public class Controller extends Thread {
 		}
 	}
 
+	public static long uptime() {
+		return System.currentTimeMillis() - Controller.startTime;
+	}
+
 	/** Returns highest block, or null if it's not available. */
 	public BlockData getChainTip() {
 		synchronized (this.latestBlocks) {
@@ -496,6 +501,9 @@ public class Controller extends Thread {
 			AutoUpdate.getInstance().start();
 		}
 
+		LOGGER.info("Starting wallets");
+		PirateChainWalletController.getInstance().start();
+
 		LOGGER.info(String.format("Starting API on port %d", Settings.getInstance().getApiPort()));
 		try {
 			ApiService apiService = ApiService.getInstance();
@@ -552,6 +560,7 @@ public class Controller extends Thread {
 		final long repositoryBackupInterval = Settings.getInstance().getRepositoryBackupInterval();
 		final long repositoryCheckpointInterval = Settings.getInstance().getRepositoryCheckpointInterval();
 		long repositoryMaintenanceInterval = getRandomRepositoryMaintenanceInterval();
+		final long prunePeersInterval = 5 * 60 * 1000L; // Every 5 minutes
 
 		// Start executor service for trimming or pruning
 		PruneManager.getInstance().start();
@@ -649,10 +658,15 @@ public class Controller extends Thread {
 				}
 
 				// Prune stuck/slow/old peers
-				try {
+				if (now >= prunePeersTimestamp + prunePeersInterval) {
-					Network.getInstance().prunePeers();
+					prunePeersTimestamp = now + prunePeersInterval;
-				} catch (DataException e) {
+
-					LOGGER.warn(String.format("Repository issue when trying to prune peers: %s", e.getMessage()));
+					try {
+						LOGGER.debug("Pruning peers...");
+						Network.getInstance().prunePeers();
+					} catch (DataException e) {
+						LOGGER.warn(String.format("Repository issue when trying to prune peers: %s", e.getMessage()));
+					}
 				}
 
 				// Delete expired transactions
@@ -717,25 +731,25 @@ public class Controller extends Thread {
 
 	public static final Predicate<Peer> hasNoRecentBlock = peer -> {
 		final Long minLatestBlockTimestamp = getMinimumLatestBlockTimestamp();
-		final PeerChainTipData peerChainTipData = peer.getChainTipData();
+		final BlockSummaryData peerChainTipData = peer.getChainTipData();
-		return peerChainTipData == null || peerChainTipData.getLastBlockTimestamp() == null || peerChainTipData.getLastBlockTimestamp() < minLatestBlockTimestamp;
+		return peerChainTipData == null || peerChainTipData.getTimestamp() == null || peerChainTipData.getTimestamp() < minLatestBlockTimestamp;
 	};
 
 	public static final Predicate<Peer> hasNoOrSameBlock = peer -> {
 		final BlockData latestBlockData = getInstance().getChainTip();
-		final PeerChainTipData peerChainTipData = peer.getChainTipData();
+		final BlockSummaryData peerChainTipData = peer.getChainTipData();
-		return peerChainTipData == null || peerChainTipData.getLastBlockSignature() == null || Arrays.equals(latestBlockData.getSignature(), peerChainTipData.getLastBlockSignature());
+		return peerChainTipData == null || peerChainTipData.getSignature() == null || Arrays.equals(latestBlockData.getSignature(), peerChainTipData.getSignature());
 	};
 
 	public static final Predicate<Peer> hasOnlyGenesisBlock = peer -> {
-		final PeerChainTipData peerChainTipData = peer.getChainTipData();
+		final BlockSummaryData peerChainTipData = peer.getChainTipData();
-		return peerChainTipData == null || peerChainTipData.getLastHeight() == null || peerChainTipData.getLastHeight() == 1;
+		return peerChainTipData == null || peerChainTipData.getHeight() == 1;
 	};
 
 	public static final Predicate<Peer> hasInferiorChainTip = peer -> {
-		final PeerChainTipData peerChainTipData = peer.getChainTipData();
+		final BlockSummaryData peerChainTipData = peer.getChainTipData();
 		final List<ByteArray> inferiorChainTips = Synchronizer.getInstance().inferiorChainSignatures;
-		return peerChainTipData == null || peerChainTipData.getLastBlockSignature() == null || inferiorChainTips.contains(ByteArray.wrap(peerChainTipData.getLastBlockSignature()));
+		return peerChainTipData == null || peerChainTipData.getSignature() == null || inferiorChainTips.contains(ByteArray.wrap(peerChainTipData.getSignature()));
 	};
 
 	public static final Predicate<Peer> hasOldVersion = peer -> {
@@ -743,6 +757,28 @@ public class Controller extends Thread {
 		return peer.isAtLeastVersion(minPeerVersion) == false;
 	};
 
+	public static final Predicate<Peer> hasInvalidSigner = peer -> {
+		final BlockSummaryData peerChainTipData = peer.getChainTipData();
+		if (peerChainTipData == null)
+			return true;
+
+		try (Repository repository = RepositoryManager.getRepository()) {
+			return Account.getRewardShareEffectiveMintingLevel(repository, peerChainTipData.getMinterPublicKey()) == 0;
+		} catch (DataException e) {
+			return true;
+		}
+	};
+
+	public static final Predicate<Peer> wasRecentlyTooDivergent = peer -> {
+		Long now = NTP.getTime();
+		Long peerLastTooDivergentTime = peer.getLastTooDivergentTime();
+		if (now == null || peerLastTooDivergentTime == null)
+			return false;
+
+		// Exclude any peers that were TOO_DIVERGENT in the last 5 mins
+		return (now - peerLastTooDivergentTime < 5 * 60 * 1000L);
+	};
+
 	private long getRandomRepositoryMaintenanceInterval() {
 		final long minInterval = Settings.getInstance().getRepositoryMaintenanceMinInterval();
 		final long maxInterval = Settings.getInstance().getRepositoryMaintenanceMaxInterval();
@@ -812,7 +848,7 @@ public class Controller extends Thread {
 				actionText = String.format("%s", Translator.INSTANCE.translate("SysTray", "SYNCHRONIZING_BLOCKCHAIN"));
 				SysTray.getInstance().setTrayIcon(3);
 			}
-			else if (OnlineAccountsManager.getInstance().hasOnlineAccounts()) {
+			else if (OnlineAccountsManager.getInstance().hasActiveOnlineAccountSignatures()) {
 				actionText = Translator.INSTANCE.translate("SysTray", "MINTING_ENABLED");
 				SysTray.getInstance().setTrayIcon(2);
 			}
@@ -825,6 +861,12 @@ public class Controller extends Thread {
 		String tooltip = String.format("%s - %d %s", actionText, numberOfPeers, connectionsText);
 		if (!Settings.getInstance().isLite()) {
 			tooltip = tooltip.concat(String.format(" - %s %d", heightText, height));
+
+			final Integer blocksRemaining = Synchronizer.getInstance().getBlocksRemaining();
+			if (blocksRemaining != null && blocksRemaining > 0) {
+				String blocksRemainingText = Translator.INSTANCE.translate("SysTray", "BLOCKS_REMAINING");
+				tooltip = tooltip.concat(String.format(" - %d %s", blocksRemaining, blocksRemainingText));
+			}
 		}
 		tooltip = tooltip.concat(String.format("\n%s: %s", Translator.INSTANCE.translate("SysTray", "BUILD_VERSION"), this.buildVersion));
 		SysTray.getInstance().setToolTipText(tooltip);
@@ -883,6 +925,9 @@ public class Controller extends Thread {
 				LOGGER.info("Shutting down API");
 				ApiService.getInstance().stop();
 
+				LOGGER.info("Shutting down wallets");
+				PirateChainWalletController.getInstance().shutdown();
+
 				if (Settings.getInstance().isAutoUpdateEnabled()) {
 					LOGGER.info("Shutting down auto-update");
 					AutoUpdate.getInstance().shutdown();
@@ -994,8 +1039,7 @@ public class Controller extends Thread {
 		network.broadcast(peer -> peer.isOutbound() ? network.buildPeersMessage(peer) : new GetPeersMessage());
 
 		// Send our current height
-		BlockData latestBlockData = getChainTip();
+		network.broadcastOurChain();
-		network.broadcast(peer -> network.buildHeightMessage(peer, latestBlockData));
 
 		// Request unconfirmed transaction signatures, but only if we're up-to-date.
 		// If we're NOT up-to-date then priority is synchronizing first
@@ -1202,6 +1246,10 @@ public class Controller extends Thread {
 				onNetworkHeightV2Message(peer, message);
 				break;
 
+			case BLOCK_SUMMARIES_V2:
+				onNetworkBlockSummariesV2Message(peer, message);
+				break;
+
 			case GET_TRANSACTION:
 				TransactionImporter.getInstance().onNetworkGetTransactionMessage(peer, message);
 				break;
@@ -1219,19 +1267,18 @@ public class Controller extends Thread {
 				break;
 
 			case GET_ONLINE_ACCOUNTS:
-				OnlineAccountsManager.getInstance().onNetworkGetOnlineAccountsMessage(peer, message);
-				break;
-
 			case ONLINE_ACCOUNTS:
-				OnlineAccountsManager.getInstance().onNetworkOnlineAccountsMessage(peer, message);
-				break;
-
 			case GET_ONLINE_ACCOUNTS_V2:
-				OnlineAccountsManager.getInstance().onNetworkGetOnlineAccountsV2Message(peer, message);
+			case ONLINE_ACCOUNTS_V2:
+				// No longer supported - to be eventually removed
 				break;
 
-			case ONLINE_ACCOUNTS_V2:
+			case GET_ONLINE_ACCOUNTS_V3:
-				OnlineAccountsManager.getInstance().onNetworkOnlineAccountsV2Message(peer, message);
+				OnlineAccountsManager.getInstance().onNetworkGetOnlineAccountsV3Message(peer, message);
+				break;
+
+			case ONLINE_ACCOUNTS_V3:
+				OnlineAccountsManager.getInstance().onNetworkOnlineAccountsV3Message(peer, message);
 				break;
 
 			case GET_ARBITRARY_DATA:
@@ -1357,8 +1404,10 @@ public class Controller extends Thread {
 				// Send valid, yet unexpected message type in response, so peer's synchronizer doesn't have to wait for timeout
 				LOGGER.debug(() -> String.format("Sending 'block unknown' response to peer %s for GET_BLOCK request for unknown block %s", peer, Base58.encode(signature)));
 
-				// We'll send empty block summaries message as it's very short
+				// Send generic 'unknown' message as it's very short
-				Message blockUnknownMessage = new BlockSummariesMessage(Collections.emptyList());
+				Message blockUnknownMessage = peer.getPeersVersion() >= GenericUnknownMessage.MINIMUM_PEER_VERSION
+						? new GenericUnknownMessage()
+						: new BlockSummariesMessage(Collections.emptyList());
 				blockUnknownMessage.setId(message.getId());
 				if (!peer.sendMessage(blockUnknownMessage))
 					peer.disconnect("failed to send block-unknown response");
@@ -1407,11 +1456,15 @@ public class Controller extends Thread {
 		this.stats.getBlockSummariesStats.requests.incrementAndGet();
 
 		// If peer's parent signature matches our latest block signature
-		// then we can short-circuit with an empty response
+		// then we have no blocks after that and can short-circuit with an empty response
 		BlockData chainTip = getChainTip();
 		if (chainTip != null && Arrays.equals(parentSignature, chainTip.getSignature())) {
-			Message blockSummariesMessage = new BlockSummariesMessage(Collections.emptyList());
+			Message blockSummariesMessage = peer.getPeersVersion() >= BlockSummariesV2Message.MINIMUM_PEER_VERSION
+					? new BlockSummariesV2Message(Collections.emptyList())
+					: new BlockSummariesMessage(Collections.emptyList());
+
 			blockSummariesMessage.setId(message.getId());
+
 			if (!peer.sendMessage(blockSummariesMessage))
 				peer.disconnect("failed to send block summaries");
 
@@ -1467,7 +1520,9 @@ public class Controller extends Thread {
 				this.stats.getBlockSummariesStats.fullyFromCache.incrementAndGet();
 		}
 
-		Message blockSummariesMessage = new BlockSummariesMessage(blockSummaries);
+		Message blockSummariesMessage = peer.getPeersVersion() >= BlockSummariesV2Message.MINIMUM_PEER_VERSION
+				? new BlockSummariesV2Message(blockSummaries)
+				: new BlockSummariesMessage(blockSummaries);
 		blockSummariesMessage.setId(message.getId());
 		if (!peer.sendMessage(blockSummariesMessage))
 			peer.disconnect("failed to send block summaries");
@@ -1542,18 +1597,59 @@ public class Controller extends Thread {
 			// If peer is inbound and we've not updated their height
 			// then this is probably their initial HEIGHT_V2 message
 			// so they need a corresponding HEIGHT_V2 message from us
-			if (!peer.isOutbound() && (peer.getChainTipData() == null || peer.getChainTipData().getLastHeight() == null))
+			if (!peer.isOutbound() && peer.getChainTipData() == null) {
-				peer.sendMessage(Network.getInstance().buildHeightMessage(peer, getChainTip()));
+				Message responseMessage = Network.getInstance().buildHeightOrChainTipInfo(peer);
+
+				if (responseMessage == null || !peer.sendMessage(responseMessage)) {
+					peer.disconnect("failed to send our chain tip info");
+					return;
+				}
+			}
 		}
 
 		// Update peer chain tip data
-		PeerChainTipData newChainTipData = new PeerChainTipData(heightV2Message.getHeight(), heightV2Message.getSignature(), heightV2Message.getTimestamp(), heightV2Message.getMinterPublicKey());
+		BlockSummaryData newChainTipData = new BlockSummaryData(heightV2Message.getHeight(), heightV2Message.getSignature(), heightV2Message.getMinterPublicKey(), heightV2Message.getTimestamp());
 		peer.setChainTipData(newChainTipData);
 
 		// Potentially synchronize
 		Synchronizer.getInstance().requestSync();
 	}
 
+	private void onNetworkBlockSummariesV2Message(Peer peer, Message message) {
+		BlockSummariesV2Message blockSummariesV2Message = (BlockSummariesV2Message) message;
+
+		if (!Settings.getInstance().isLite()) {
+			// If peer is inbound and we've not updated their height
+			// then this is probably their initial BLOCK_SUMMARIES_V2 message
+			// so they need a corresponding BLOCK_SUMMARIES_V2 message from us
+			if (!peer.isOutbound() && peer.getChainTipData() == null) {
+				Message responseMessage = Network.getInstance().buildHeightOrChainTipInfo(peer);
+
+				if (responseMessage == null || !peer.sendMessage(responseMessage)) {
+					peer.disconnect("failed to send our chain tip info");
+					return;
+				}
+			}
+		}
+
+		if (message.hasId()) {
+			/*
+			 * Experimental proof-of-concept: discard messages with ID
+			 * These are 'late' reply messages received after timeout has expired,
+			 * having been passed upwards from Peer to Network to Controller.
+			 * Hence, these are NOT simple "here's my chain tip" broadcasts from other peers.
+			 */
+			LOGGER.debug("Discarding late {} message with ID {} from {}", message.getType().name(), message.getId(), peer);
+			return;
+		}
+
+		// Update peer chain tip data
+		peer.setChainTipSummaries(blockSummariesV2Message.getBlockSummaries());
+
+		// Potentially synchronize
+		Synchronizer.getInstance().requestSync();
+	}
+
 	private void onNetworkGetAccountMessage(Peer peer, Message message) {
 		GetAccountMessage getAccountMessage = (GetAccountMessage) message;
 		String address = getAccountMessage.getAddress();
@@ -1569,8 +1665,8 @@ public class Controller extends Thread {
 				// Send valid, yet unexpected message type in response, so peer doesn't have to wait for timeout
 				LOGGER.debug(() -> String.format("Sending 'account unknown' response to peer %s for GET_ACCOUNT request for unknown account %s", peer, address));
 
-				// We'll send empty block summaries message as it's very short
+				// Send generic 'unknown' message as it's very short
-				Message accountUnknownMessage = new BlockSummariesMessage(Collections.emptyList());
+				Message accountUnknownMessage = new GenericUnknownMessage();
 				accountUnknownMessage.setId(message.getId());
 				if (!peer.sendMessage(accountUnknownMessage))
 					peer.disconnect("failed to send account-unknown response");
@@ -1605,8 +1701,8 @@ public class Controller extends Thread {
 				// Send valid, yet unexpected message type in response, so peer doesn't have to wait for timeout
 				LOGGER.debug(() -> String.format("Sending 'account unknown' response to peer %s for GET_ACCOUNT_BALANCE request for unknown account %s and asset ID %d", peer, address, assetId));
 
-				// We'll send empty block summaries message as it's very short
+				// Send generic 'unknown' message as it's very short
-				Message accountUnknownMessage = new BlockSummariesMessage(Collections.emptyList());
+				Message accountUnknownMessage = new GenericUnknownMessage();
 				accountUnknownMessage.setId(message.getId());
 				if (!peer.sendMessage(accountUnknownMessage))
 					peer.disconnect("failed to send account-unknown response");
@@ -1649,8 +1745,8 @@ public class Controller extends Thread {
 				// Send valid, yet unexpected message type in response, so peer doesn't have to wait for timeout
 				LOGGER.debug(() -> String.format("Sending 'account unknown' response to peer %s for GET_ACCOUNT_TRANSACTIONS request for unknown account %s", peer, address));
 
-				// We'll send empty block summaries message as it's very short
+				// Send generic 'unknown' message as it's very short
-				Message accountUnknownMessage = new BlockSummariesMessage(Collections.emptyList());
+				Message accountUnknownMessage = new GenericUnknownMessage();
 				accountUnknownMessage.setId(message.getId());
 				if (!peer.sendMessage(accountUnknownMessage))
 					peer.disconnect("failed to send account-unknown response");
@@ -1686,8 +1782,8 @@ public class Controller extends Thread {
 				// Send valid, yet unexpected message type in response, so peer doesn't have to wait for timeout
 				LOGGER.debug(() -> String.format("Sending 'account unknown' response to peer %s for GET_ACCOUNT_NAMES request for unknown account %s", peer, address));
 
-				// We'll send empty block summaries message as it's very short
+				// Send generic 'unknown' message as it's very short
-				Message accountUnknownMessage = new BlockSummariesMessage(Collections.emptyList());
+				Message accountUnknownMessage = new GenericUnknownMessage();
 				accountUnknownMessage.setId(message.getId());
 				if (!peer.sendMessage(accountUnknownMessage))
 					peer.disconnect("failed to send account-unknown response");
@@ -1721,8 +1817,8 @@ public class Controller extends Thread {
 				// Send valid, yet unexpected message type in response, so peer doesn't have to wait for timeout
 				LOGGER.debug(() -> String.format("Sending 'name unknown' response to peer %s for GET_NAME request for unknown name %s", peer, name));
 
-				// We'll send empty block summaries message as it's very short
+				// Send generic 'unknown' message as it's very short
-				Message nameUnknownMessage = new BlockSummariesMessage(Collections.emptyList());
+				Message nameUnknownMessage = new GenericUnknownMessage();
 				nameUnknownMessage.setId(message.getId());
 				if (!peer.sendMessage(nameUnknownMessage))
 					peer.disconnect("failed to send name-unknown response");
@@ -1770,14 +1866,14 @@ public class Controller extends Thread {
 				continue;
 			}
 
-			final PeerChainTipData peerChainTipData = peer.getChainTipData();
+			BlockSummaryData peerChainTipData = peer.getChainTipData();
 			if (peerChainTipData == null) {
 				iterator.remove();
 				continue;
 			}
 
 			// Disregard peers that don't have a recent block
-			if (peerChainTipData.getLastBlockTimestamp() == null || peerChainTipData.getLastBlockTimestamp() < minLatestBlockTimestamp) {
+			if (peerChainTipData.getTimestamp() == null || peerChainTipData.getTimestamp() < minLatestBlockTimestamp) {
 				iterator.remove();
 				continue;
 			}
@@ -1805,6 +1901,10 @@ public class Controller extends Thread {
 		if (latestBlockData == null || latestBlockData.getTimestamp() < minLatestBlockTimestamp)
 			return false;
 
+		if (Settings.getInstance().isSingleNodeTestnet())
+			// Single node testnets won't have peers, so we can assume up to date from this point
+			return true;
+
 		// Needs a mutable copy of the unmodifiableList
 		List<Peer> peers = new ArrayList<>(Network.getInstance().getImmutableHandshakedPeers());
 		if (peers == null)

src/main/java/org/qortal/controller/PirateChainWalletController.java

@@ -0,0 +1,404 @@
+package org.qortal.controller;
+
+import com.rust.litewalletjni.LiteWalletJni;
+import org.apache.commons.io.FileUtils;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.qortal.arbitrary.ArbitraryDataFile;
+import org.qortal.arbitrary.ArbitraryDataReader;
+import org.qortal.arbitrary.ArbitraryDataResource;
+import org.qortal.arbitrary.exception.MissingDataException;
+import org.qortal.crosschain.ForeignBlockchainException;
+import org.qortal.crosschain.PirateWallet;
+import org.qortal.data.arbitrary.ArbitraryResourceStatus;
+import org.qortal.data.transaction.ArbitraryTransactionData;
+import org.qortal.data.transaction.TransactionData;
+import org.qortal.network.Network;
+import org.qortal.network.Peer;
+import org.qortal.repository.DataException;
+import org.qortal.repository.Repository;
+import org.qortal.repository.RepositoryManager;
+import org.qortal.settings.Settings;
+import org.qortal.transaction.ArbitraryTransaction;
+import org.qortal.utils.ArbitraryTransactionUtils;
+import org.qortal.utils.Base58;
+import org.qortal.utils.FilesystemUtils;
+import org.qortal.utils.NTP;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.List;
+import java.util.Objects;
+
+public class PirateChainWalletController extends Thread {
+
+    protected static final Logger LOGGER = LogManager.getLogger(PirateChainWalletController.class);
+
+    private static PirateChainWalletController instance;
+
+    final private static long SAVE_INTERVAL = 60 * 60 * 1000L; // 1 hour
+    private long lastSaveTime = 0L;
+
+    private boolean running;
+    private PirateWallet currentWallet = null;
+    private boolean shouldLoadWallet = false;
+    private String loadStatus = null;
+
+    private static String qdnWalletSignature = "EsfUw54perxkEtfoUoL7Z97XPrNsZRZXePVZPz3cwRm9qyEPSofD5KmgVpDqVitQp7LhnZRmL6z2V9hEe1YS45T";
+
+
+    private PirateChainWalletController() {
+        this.running = true;
+    }
+
+    public static PirateChainWalletController getInstance() {
+        if (instance == null)
+            instance = new PirateChainWalletController();
+
+        return instance;
+    }
+
+    @Override
+    public void run() {
+        Thread.currentThread().setName("Pirate Chain Wallet Controller");
+
+        try {
+            while (running && !Controller.isStopping()) {
+                Thread.sleep(1000);
+
+                // Wait until we have a request to load the wallet
+                if (!shouldLoadWallet) {
+                    continue;
+                }
+
+                if (!LiteWalletJni.isLoaded()) {
+                    this.loadLibrary();
+
+                    // If still not loaded, sleep to prevent too many requests
+                    if (!LiteWalletJni.isLoaded()) {
+                        Thread.sleep(5 * 1000);
+                        continue;
+                    }
+                }
+
+                // Wallet is downloaded, so clear the status
+                this.loadStatus = null;
+
+                if (this.currentWallet == null) {
+                    // Nothing to do yet
+                    continue;
+                }
+                if (this.currentWallet.isNullSeedWallet()) {
+                    // Don't sync the null seed wallet
+                    continue;
+                }
+
+                LOGGER.debug("Syncing Pirate Chain wallet...");
+                String response = LiteWalletJni.execute("sync", "");
+                LOGGER.debug("sync response: {}", response);
+
+                try {
+                    JSONObject json = new JSONObject(response);
+                    if (json.has("result")) {
+                        String result = json.getString("result");
+
+                        // We may have to set wallet to ready if this is the first ever successful sync
+                        if (Objects.equals(result, "success")) {
+                            this.currentWallet.setReady(true);
+                        }
+                    }
+                } catch (JSONException e) {
+                    LOGGER.info("Unable to interpret JSON", e);
+                }
+
+                // Rate limit sync attempts
+                Thread.sleep(30000);
+
+                // Save wallet if needed
+                Long now = NTP.getTime();
+                if (now != null && now-SAVE_INTERVAL >= this.lastSaveTime) {
+                    this.saveCurrentWallet();
+                }
+            }
+        } catch (InterruptedException e) {
+            // Fall-through to exit
+        }
+    }
+
+    public void shutdown() {
+        // Save the wallet
+        this.saveCurrentWallet();
+
+        this.running = false;
+        this.interrupt();
+    }
+
+
+    // QDN & wallet libraries
+
+    private void loadLibrary() throws InterruptedException {
+        try (final Repository repository = RepositoryManager.getRepository()) {
+
+            // Check if architecture is supported
+            String libFileName = PirateChainWalletController.getRustLibFilename();
+            if (libFileName == null) {
+                String osName = System.getProperty("os.name");
+                String osArchitecture = System.getProperty("os.arch");
+                this.loadStatus = String.format("Unsupported architecture (%s %s)", osName, osArchitecture);
+                return;
+            }
+
+            // Check if the library exists in the wallets folder
+            Path libDirectory = PirateChainWalletController.getRustLibOuterDirectory();
+            Path libPath = Paths.get(libDirectory.toString(), libFileName);
+            if (Files.exists(libPath)) {
+                // Already downloaded; we can load the library right away
+                LiteWalletJni.loadLibrary();
+                return;
+            }
+
+            // Library not found, so check if we've fetched the resource from QDN
+            ArbitraryTransactionData t = this.getTransactionData(repository);
+            if (t == null) {
+                // Can't find the transaction - maybe on a different chain?
+                return;
+            }
+
+            // Wait until we have a sufficient number of peers to attempt QDN downloads
+            List<Peer> handshakedPeers = Network.getInstance().getImmutableHandshakedPeers();
+            if (handshakedPeers.size() < Settings.getInstance().getMinBlockchainPeers()) {
+                // Wait for more peers
+                this.loadStatus = String.format("Searching for peers...");
+                return;
+            }
+
+            // Build resource
+            ArbitraryDataReader arbitraryDataReader = new ArbitraryDataReader(t.getName(),
+                    ArbitraryDataFile.ResourceIdType.NAME, t.getService(), t.getIdentifier());
+            try {
+                arbitraryDataReader.loadSynchronously(false);
+            } catch (MissingDataException e) {
+                LOGGER.info("Missing data when loading Pirate Chain library");
+            }
+
+            // Check its status
+            ArbitraryResourceStatus status = ArbitraryTransactionUtils.getStatus(
+                    t.getService(), t.getName(), t.getIdentifier(), false);
+
+            if (status.getStatus() != ArbitraryResourceStatus.Status.READY) {
+                LOGGER.info("Not ready yet: {}", status.getTitle());
+                this.loadStatus = String.format("Downloading files from QDN... (%d / %d)", status.getLocalChunkCount(), status.getTotalChunkCount());
+                return;
+            }
+
+            // Files are downloaded, so copy the necessary files to the wallets folder
+            // Delete the wallets/*/lib directory first, in case earlier versions of the wallet are present
+            Path walletsLibDirectory = PirateChainWalletController.getWalletsLibDirectory();
+            if (Files.exists(walletsLibDirectory)) {
+                FilesystemUtils.safeDeleteDirectory(walletsLibDirectory, false);
+            }
+            Files.createDirectories(libDirectory);
+            FileUtils.copyDirectory(arbitraryDataReader.getFilePath().toFile(), libDirectory.toFile());
+
+            // Clear reader cache so only one copy exists
+            ArbitraryDataResource resource = new ArbitraryDataResource(t.getName(),
+                    ArbitraryDataFile.ResourceIdType.NAME, t.getService(), t.getIdentifier());
+            resource.deleteCache();
+
+            // Finally, load the library
+            LiteWalletJni.loadLibrary();
+
+        } catch (DataException e) {
+            LOGGER.error("Repository issue when loading Pirate Chain library", e);
+        } catch (IOException e) {
+            LOGGER.error("Error when loading Pirate Chain library", e);
+        }
+    }
+
+    private ArbitraryTransactionData getTransactionData(Repository repository) {
+        try {
+            byte[] signature = Base58.decode(qdnWalletSignature);
+            TransactionData transactionData = repository.getTransactionRepository().fromSignature(signature);
+            if (!(transactionData instanceof ArbitraryTransactionData))
+                return null;
+
+            ArbitraryTransaction arbitraryTransaction = new ArbitraryTransaction(repository, transactionData);
+            if (arbitraryTransaction != null) {
+                return (ArbitraryTransactionData) arbitraryTransaction.getTransactionData();
+            }
+
+            return null;
+        } catch (DataException e) {
+            return null;
+        }
+    }
+
+    public static String getRustLibFilename() {
+        String osName = System.getProperty("os.name");
+        String osArchitecture = System.getProperty("os.arch");
+
+        if (osName.equals("Mac OS X") && osArchitecture.equals("x86_64")) {
+            return "librust-macos-x86_64.dylib";
+        }
+        else if ((osName.equals("Linux") || osName.equals("FreeBSD")) && osArchitecture.equals("aarch64")) {
+            return "librust-linux-aarch64.so";
+        }
+        else if ((osName.equals("Linux") || osName.equals("FreeBSD")) && osArchitecture.equals("amd64")) {
+            return "librust-linux-x86_64.so";
+        }
+        else if (osName.contains("Windows") && osArchitecture.equals("amd64")) {
+            return "librust-windows-x86_64.dll";
+        }
+
+        return null;
+    }
+
+    public static Path getWalletsLibDirectory() {
+        return Paths.get(Settings.getInstance().getWalletsPath(), "PirateChain", "lib");
+    }
+
+    public static Path getRustLibOuterDirectory() {
+        String sigPrefix = qdnWalletSignature.substring(0, 8);
+        return Paths.get(Settings.getInstance().getWalletsPath(), "PirateChain", "lib", sigPrefix);
+    }
+
+
+    // Wallet functions
+
+    public boolean initWithEntropy58(String entropy58) {
+        return this.initWithEntropy58(entropy58, false);
+    }
+
+    public boolean initNullSeedWallet() {
+        return this.initWithEntropy58(Base58.encode(new byte[32]), true);
+    }
+
+    private boolean initWithEntropy58(String entropy58, boolean isNullSeedWallet) {
+        // If the JNI library isn't loaded yet then we can't proceed
+        if (!LiteWalletJni.isLoaded()) {
+            shouldLoadWallet = true;
+            return false;
+        }
+
+        byte[] entropyBytes = Base58.decode(entropy58);
+
+        if (entropyBytes == null || entropyBytes.length != 32) {
+            LOGGER.info("Invalid entropy bytes");
+            return false;
+        }
+
+        if (this.currentWallet != null) {
+            if (this.currentWallet.entropyBytesEqual(entropyBytes)) {
+                // Wallet already active - nothing to do
+                return true;
+            }
+            else {
+                // Different wallet requested - close the existing one and switch over
+                this.closeCurrentWallet();
+            }
+        }
+
+        try {
+            this.currentWallet = new PirateWallet(entropyBytes, isNullSeedWallet);
+            if (!this.currentWallet.isReady()) {
+                // Don't persist wallets that aren't ready
+                this.currentWallet = null;
+            }
+            return true;
+        } catch (IOException e) {
+            LOGGER.info("Unable to initialize wallet: {}", e.getMessage());
+        }
+
+        return false;
+    }
+
+    private void saveCurrentWallet() {
+        if (this.currentWallet == null) {
+            // Nothing to do
+            return;
+        }
+        try {
+            if (this.currentWallet.save()) {
+                Long now = NTP.getTime();
+                if (now != null) {
+                    this.lastSaveTime = now;
+                }
+            }
+        } catch (IOException e) {
+            LOGGER.info("Unable to save wallet");
+        }
+    }
+
+    public PirateWallet getCurrentWallet() {
+        return this.currentWallet;
+    }
+
+    private void closeCurrentWallet() {
+        this.saveCurrentWallet();
+        this.currentWallet = null;
+    }
+
+    public void ensureInitialized() throws ForeignBlockchainException {
+        if (!LiteWalletJni.isLoaded() || this.currentWallet == null || !this.currentWallet.isInitialized()) {
+            throw new ForeignBlockchainException("Pirate wallet isn't initialized yet");
+        }
+    }
+
+    public void ensureNotNullSeed() throws ForeignBlockchainException {
+        // Safety check to make sure funds aren't sent to a null seed wallet
+        if (this.currentWallet == null || this.currentWallet.isNullSeedWallet()) {
+            throw new ForeignBlockchainException("Invalid wallet");
+        }
+    }
+
+    public void ensureSynchronized() throws ForeignBlockchainException {
+        if (this.currentWallet == null || !this.currentWallet.isSynchronized()) {
+            throw new ForeignBlockchainException("Wallet isn't synchronized yet");
+        }
+
+        String response = LiteWalletJni.execute("syncStatus", "");
+        JSONObject json = new JSONObject(response);
+        if (json.has("syncing")) {
+            boolean isSyncing = Boolean.valueOf(json.getString("syncing"));
+            if (isSyncing) {
+                long syncedBlocks = json.getLong("synced_blocks");
+                long totalBlocks = json.getLong("total_blocks");
+
+                throw new ForeignBlockchainException(String.format("Sync in progress (%d / %d). Please try again later.", syncedBlocks, totalBlocks));
+            }
+        }
+    }
+
+    public String getSyncStatus() {
+        if (this.currentWallet == null || !this.currentWallet.isInitialized()) {
+            if (this.loadStatus != null) {
+                return this.loadStatus;
+            }
+
+            return "Not initialized yet";
+        }
+
+        String syncStatusResponse = LiteWalletJni.execute("syncStatus", "");
+        org.json.JSONObject json = new JSONObject(syncStatusResponse);
+        if (json.has("syncing")) {
+            boolean isSyncing = Boolean.valueOf(json.getString("syncing"));
+            if (isSyncing) {
+                long syncedBlocks = json.getLong("synced_blocks");
+                long totalBlocks = json.getLong("total_blocks");
+                return String.format("Sync in progress (%d / %d)", syncedBlocks, totalBlocks);
+            }
+        }
+
+        boolean isSynchronized = this.currentWallet.isSynchronized();
+        if (isSynchronized) {
+            return "Synchronized";
+        }
+
+        return "Initializing wallet...";
+    }
+
+}

src/main/java/org/qortal/controller/Synchronizer.java

@@ -19,7 +19,6 @@ import org.qortal.block.BlockChain;
 import org.qortal.data.block.BlockData;
 import org.qortal.data.block.BlockSummaryData;
 import org.qortal.data.block.CommonBlockData;
-import org.qortal.data.network.PeerChainTipData;
 import org.qortal.data.transaction.RewardShareTransactionData;
 import org.qortal.data.transaction.TransactionData;
 import org.qortal.event.Event;
@@ -54,7 +53,8 @@ public class Synchronizer extends Thread {
 	/** Maximum number of block signatures we ask from peer in one go */
 	private static final int MAXIMUM_REQUEST_SIZE = 200; // XXX move to Settings?
 
-	private static final long RECOVERY_MODE_TIMEOUT = 10 * 60 * 1000L; // ms
+	/** Maximum number of consecutive failed sync attempts before marking peer as misbehaved */
+	private static final int MAX_CONSECUTIVE_FAILED_SYNC_ATTEMPTS = 3;
 
 
 	private boolean running;
@@ -76,12 +76,14 @@ public class Synchronizer extends Thread {
 	private volatile boolean isSynchronizing = false;
 	/** Temporary estimate of synchronization progress for SysTray use. */
 	private volatile int syncPercent = 0;
+	/** Temporary estimate of blocks remaining for SysTray use. */
+	private volatile int blocksRemaining = 0;
 
 	private static volatile boolean requestSync = false;
 	private boolean syncRequestPending = false;
 
 	// Keep track of invalid blocks so that we don't keep trying to sync them
-	private Map<String, Long> invalidBlockSignatures = Collections.synchronizedMap(new HashMap<>());
+	private Map<ByteArray, Long> invalidBlockSignatures = Collections.synchronizedMap(new HashMap<>());
 	public Long timeValidBlockLastReceived = null;
 	public Long timeInvalidBlockLastReceived = null;
 
@@ -181,6 +183,18 @@ public class Synchronizer extends Thread {
 		}
 	}
 
+	public Integer getBlocksRemaining() {
+		synchronized (this.syncLock) {
+			// Report as 0 blocks remaining if the latest block is within the last 60 mins
+			final Long minLatestBlockTimestamp = NTP.getTime() - (60 * 60 * 1000L);
+			if (Controller.getInstance().isUpToDate(minLatestBlockTimestamp)) {
+				return 0;
+			}
+
+			return this.isSynchronizing ? this.blocksRemaining : null;
+		}
+	}
+
 	public void requestSync() {
 		requestSync = true;
 	}
@@ -233,6 +247,9 @@ public class Synchronizer extends Thread {
 		// Disregard peers that are on the same block as last sync attempt and we didn't like their chain
 		peers.removeIf(Controller.hasInferiorChainTip);
 
+		// Disregard peers that have a block with an invalid signer
+		peers.removeIf(Controller.hasInvalidSigner);
+
 		final int peersBeforeComparison = peers.size();
 
 		// Request recent block summaries from the remaining peers, and locate our common block with each
@@ -282,7 +299,7 @@ public class Synchronizer extends Thread {
 		BlockData priorChainTip = Controller.getInstance().getChainTip();
 
 		synchronized (this.syncLock) {
-			this.syncPercent = (priorChainTip.getHeight() * 100) / peer.getChainTipData().getLastHeight();
+			this.syncPercent = (priorChainTip.getHeight() * 100) / peer.getChainTipData().getHeight();
 
 			// Only update SysTray if we're potentially changing height
 			if (this.syncPercent < 100) {
@@ -312,7 +329,7 @@ public class Synchronizer extends Thread {
 
 				case INFERIOR_CHAIN: {
 					// Update our list of inferior chain tips
-					ByteArray inferiorChainSignature = ByteArray.wrap(peer.getChainTipData().getLastBlockSignature());
+					ByteArray inferiorChainSignature = ByteArray.wrap(peer.getChainTipData().getSignature());
 					if (!inferiorChainSignatures.contains(inferiorChainSignature))
 						inferiorChainSignatures.add(inferiorChainSignature);
 
@@ -320,7 +337,8 @@ public class Synchronizer extends Thread {
 					LOGGER.debug(() -> String.format("Refused to synchronize with peer %s (%s)", peer, syncResult.name()));
 
 					// Notify peer of our superior chain
-					if (!peer.sendMessage(Network.getInstance().buildHeightMessage(peer, priorChainTip)))
+					Message message = Network.getInstance().buildHeightOrChainTipInfo(peer);
+					if (message == null || !peer.sendMessage(message))
 						peer.disconnect("failed to notify peer of our superior chain");
 					break;
 				}
@@ -341,7 +359,7 @@ public class Synchronizer extends Thread {
 					// fall-through...
 				case NOTHING_TO_DO: {
 					// Update our list of inferior chain tips
-					ByteArray inferiorChainSignature = ByteArray.wrap(peer.getChainTipData().getLastBlockSignature());
+					ByteArray inferiorChainSignature = ByteArray.wrap(peer.getChainTipData().getSignature());
 					if (!inferiorChainSignatures.contains(inferiorChainSignature))
 						inferiorChainSignatures.add(inferiorChainSignature);
 
@@ -369,8 +387,7 @@ public class Synchronizer extends Thread {
 				// Reset our cache of inferior chains
 				inferiorChainSignatures.clear();
 
-				Network network = Network.getInstance();
+				Network.getInstance().broadcastOurChain();
-				network.broadcast(broadcastPeer -> network.buildHeightMessage(broadcastPeer, newChainTip));
 
 				EventBus.INSTANCE.notify(new NewChainTipEvent(priorChainTip, newChainTip));
 			}
@@ -397,9 +414,10 @@ public class Synchronizer extends Thread {
 					timePeersLastAvailable = NTP.getTime();
 
 				// If enough time has passed, enter recovery mode, which lifts some restrictions on who we can sync with and when we can mint
-				if (NTP.getTime() - timePeersLastAvailable > RECOVERY_MODE_TIMEOUT) {
+				long recoveryModeTimeout = Settings.getInstance().getRecoveryModeTimeout();
+				if (NTP.getTime() - timePeersLastAvailable > recoveryModeTimeout) {
 					if (recoveryMode == false) {
-						LOGGER.info(String.format("Peers have been unavailable for %d minutes. Entering recovery mode...", RECOVERY_MODE_TIMEOUT/60/1000));
+						LOGGER.info(String.format("Peers have been unavailable for %d minutes. Entering recovery mode...", recoveryModeTimeout/60/1000));
 						recoveryMode = true;
 					}
 				}
@@ -513,13 +531,13 @@ public class Synchronizer extends Thread {
 			final BlockData ourLatestBlockData = repository.getBlockRepository().getLastBlock();
 			final int ourInitialHeight = ourLatestBlockData.getHeight();
 
-			PeerChainTipData peerChainTipData = peer.getChainTipData();
+			BlockSummaryData peerChainTipData = peer.getChainTipData();
-			int peerHeight = peerChainTipData.getLastHeight();
+			int peerHeight = peerChainTipData.getHeight();
-			byte[] peersLastBlockSignature = peerChainTipData.getLastBlockSignature();
+			byte[] peersLastBlockSignature = peerChainTipData.getSignature();
 
 			byte[] ourLastBlockSignature = ourLatestBlockData.getSignature();
 			LOGGER.debug(String.format("Fetching summaries from peer %s at height %d, sig %.8s, ts %d; our height %d, sig %.8s, ts %d", peer,
-					peerHeight, Base58.encode(peersLastBlockSignature), peer.getChainTipData().getLastBlockTimestamp(),
+					peerHeight, Base58.encode(peersLastBlockSignature), peerChainTipData.getTimestamp(),
 					ourInitialHeight, Base58.encode(ourLastBlockSignature), ourLatestBlockData.getTimestamp()));
 
 			List<BlockSummaryData> peerBlockSummaries = new ArrayList<>();
@@ -617,7 +635,7 @@ public class Synchronizer extends Thread {
 							// We have already determined that the correct chain diverged from a lower height. We are safe to skip these peers.
 							for (Peer peer : peersSharingCommonBlock) {
 								LOGGER.debug(String.format("Peer %s has common block at height %d but the superior chain is at height %d. Removing it from this round.", peer, commonBlockSummary.getHeight(), dropPeersAfterCommonBlockHeight));
-								this.addInferiorChainSignature(peer.getChainTipData().getLastBlockSignature());
+								//this.addInferiorChainSignature(peer.getChainTipData().getLastBlockSignature());
 							}
 							continue;
 						}
@@ -628,16 +646,18 @@ public class Synchronizer extends Thread {
 					int minChainLength = this.calculateMinChainLengthOfPeers(peersSharingCommonBlock, commonBlockSummary);
 
 					// Fetch block summaries from each peer
-					for (Peer peer : peersSharingCommonBlock) {
+					Iterator peersSharingCommonBlockIterator = peersSharingCommonBlock.iterator();
+					while (peersSharingCommonBlockIterator.hasNext()) {
+						Peer peer = (Peer) peersSharingCommonBlockIterator.next();
 
 						// If we're shutting down, just return the latest peer list
 						if (Controller.isStopping())
 							return peers;
 
 						// Count the number of blocks this peer has beyond our common block
-						final PeerChainTipData peerChainTipData = peer.getChainTipData();
+						final BlockSummaryData peerChainTipData = peer.getChainTipData();
-						final int peerHeight = peerChainTipData.getLastHeight();
+						final int peerHeight = peerChainTipData.getHeight();
-						final byte[] peerLastBlockSignature = peerChainTipData.getLastBlockSignature();
+						final byte[] peerLastBlockSignature = peerChainTipData.getSignature();
 						final int peerAdditionalBlocksAfterCommonBlock = peerHeight - commonBlockSummary.getHeight();
 						// Limit the number of blocks we are comparing. FUTURE: we could request more in batches, but there may not be a case when this is needed
 						int summariesRequired = Math.min(peerAdditionalBlocksAfterCommonBlock, MAXIMUM_REQUEST_SIZE);
@@ -685,6 +705,8 @@ public class Synchronizer extends Thread {
 						if (this.containsInvalidBlockSummary(peer.getCommonBlockData().getBlockSummariesAfterCommonBlock())) {
 							LOGGER.debug("Ignoring peer %s because it holds an invalid block", peer);
 							peers.remove(peer);
+							peersSharingCommonBlockIterator.remove();
+							continue;
 						}
 
 						// Reduce minChainLength if needed. If we don't have any blocks, this peer will be excluded from chain weight comparisons later in the process, so we shouldn't update minChainLength
@@ -723,8 +745,9 @@ public class Synchronizer extends Thread {
 
 					LOGGER.debug(String.format("Listing peers with common block %.8s...", Base58.encode(commonBlockSummary.getSignature())));
 					for (Peer peer : peersSharingCommonBlock) {
-						final int peerHeight = peer.getChainTipData().getLastHeight();
+						BlockSummaryData peerChainTipData = peer.getChainTipData();
-						final Long peerLastBlockTimestamp = peer.getChainTipData().getLastBlockTimestamp();
+						final int peerHeight = peerChainTipData.getHeight();
+						final Long peerLastBlockTimestamp = peerChainTipData.getTimestamp();
 						final int peerAdditionalBlocksAfterCommonBlock = peerHeight - commonBlockSummary.getHeight();
 						final CommonBlockData peerCommonBlockData = peer.getCommonBlockData();
 
@@ -821,7 +844,7 @@ public class Synchronizer extends Thread {
 		// Calculate the length of the shortest peer chain sharing this common block
 		int minChainLength = 0;
 		for (Peer peer : peersSharingCommonBlock) {
-			final int peerHeight = peer.getChainTipData().getLastHeight();
+			final int peerHeight = peer.getChainTipData().getHeight();
 			final int peerAdditionalBlocksAfterCommonBlock = peerHeight - commonBlockSummary.getHeight();
 
 			if (peerAdditionalBlocksAfterCommonBlock < minChainLength || minChainLength == 0)
@@ -840,6 +863,10 @@ public class Synchronizer extends Thread {
 
 	/* Invalid block signature tracking */
 
+	public Map<ByteArray, Long> getInvalidBlockSignatures() {
+		return this.invalidBlockSignatures;
+	}
+
 	private void addInvalidBlockSignature(byte[] signature) {
 		Long now = NTP.getTime();
 		if (now == null) {
@@ -847,8 +874,7 @@ public class Synchronizer extends Thread {
 		}
 
 		// Add or update existing entry
-		String sig58 = Base58.encode(signature);
+		invalidBlockSignatures.put(ByteArray.wrap(signature), now);
-		invalidBlockSignatures.put(sig58, now);
 	}
 	private void deleteOlderInvalidSignatures(Long now) {
 		if (now == null) {
@@ -867,17 +893,16 @@ public class Synchronizer extends Thread {
 			}
 		}
 	}
-	private boolean containsInvalidBlockSummary(List<BlockSummaryData> blockSummaries) {
+	public boolean containsInvalidBlockSummary(List<BlockSummaryData> blockSummaries) {
 		if (blockSummaries == null || invalidBlockSignatures == null) {
 			return false;
 		}
 
 		// Loop through our known invalid blocks and check each one against supplied block summaries
-		for (String invalidSignature58 : invalidBlockSignatures.keySet()) {
+		for (ByteArray invalidSignature : invalidBlockSignatures.keySet()) {
-			byte[] invalidSignature = Base58.decode(invalidSignature58);
 			for (BlockSummaryData blockSummary : blockSummaries) {
 				byte[] signature = blockSummary.getSignature();
-				if (Arrays.equals(signature, invalidSignature)) {
+				if (Arrays.equals(signature, invalidSignature.value)) {
 					return true;
 				}
 			}
@@ -890,10 +915,9 @@ public class Synchronizer extends Thread {
 		}
 
 		// Loop through our known invalid blocks and check each one against supplied block signatures
-		for (String invalidSignature58 : invalidBlockSignatures.keySet()) {
+		for (ByteArray invalidSignature : invalidBlockSignatures.keySet()) {
-			byte[] invalidSignature = Base58.decode(invalidSignature58);
 			for (byte[] signature : blockSignatures) {
-				if (Arrays.equals(signature, invalidSignature)) {
+				if (Arrays.equals(signature, invalidSignature.value)) {
 					return true;
 				}
 			}
@@ -928,13 +952,13 @@ public class Synchronizer extends Thread {
 					final BlockData ourLatestBlockData = repository.getBlockRepository().getLastBlock();
 					final int ourInitialHeight = ourLatestBlockData.getHeight();
 
-					PeerChainTipData peerChainTipData = peer.getChainTipData();
+					BlockSummaryData peerChainTipData = peer.getChainTipData();
-					int peerHeight = peerChainTipData.getLastHeight();
+					int peerHeight = peerChainTipData.getHeight();
-					byte[] peersLastBlockSignature = peerChainTipData.getLastBlockSignature();
+					byte[] peersLastBlockSignature = peerChainTipData.getSignature();
 
 					byte[] ourLastBlockSignature = ourLatestBlockData.getSignature();
 					String syncString = String.format("Synchronizing with peer %s at height %d, sig %.8s, ts %d; our height %d, sig %.8s, ts %d", peer,
-							peerHeight, Base58.encode(peersLastBlockSignature), peer.getChainTipData().getLastBlockTimestamp(),
+							peerHeight, Base58.encode(peersLastBlockSignature), peerChainTipData.getTimestamp(),
 							ourInitialHeight, Base58.encode(ourLastBlockSignature), ourLatestBlockData.getTimestamp());
 					LOGGER.info(syncString);
 
@@ -1097,6 +1121,7 @@ public class Synchronizer extends Thread {
 			// If common block is too far behind us then we're on massively different forks so give up.
 			if (!force && testHeight < ourHeight - MAXIMUM_COMMON_DELTA) {
 				LOGGER.info(String.format("Blockchain too divergent with peer %s", peer));
+				peer.setLastTooDivergentTime(NTP.getTime());
 				return SynchronizationResult.TOO_DIVERGENT;
 			}
 
@@ -1106,6 +1131,9 @@ public class Synchronizer extends Thread {
 			testHeight = Math.max(testHeight - step, 1);
 		}
 
+		// Peer not considered too divergent
+		peer.setLastTooDivergentTime(0L);
+
 		// Prepend test block's summary as first block summary, as summaries returned are *after* test block
 		BlockSummaryData testBlockSummary = new BlockSummaryData(testBlockData);
 		blockSummariesFromCommon.add(0, testBlockSummary);
@@ -1241,7 +1269,14 @@ public class Synchronizer extends Thread {
 		int numberSignaturesRequired = additionalPeerBlocksAfterCommonBlock - peerBlockSignatures.size();
 
 		int retryCount = 0;
-		while (height < peerHeight) {
+
+		// Keep fetching blocks from peer until we reach their tip, or reach a count of MAXIMUM_COMMON_DELTA blocks.
+		// We need to limit the total number, otherwise too much can be loaded into memory, causing an
+		// OutOfMemoryException. This is common when syncing from 1000+ blocks behind the chain tip, after starting
+		// from a small fork that didn't become part of the main chain. This causes the entire sync process to
+		// use syncToPeerChain(), resulting in potentially thousands of blocks being held in memory if the limit
+		// below isn't applied.
+		while (height < peerHeight && peerBlocks.size() <= MAXIMUM_COMMON_DELTA) {
 			if (Controller.isStopping())
 				return SynchronizationResult.SHUTTING_DOWN;
 
@@ -1308,7 +1343,7 @@ public class Synchronizer extends Thread {
 			// Final check to make sure the peer isn't out of date (except for when we're in recovery mode)
 			if (!recoveryMode && peer.getChainTipData() != null) {
 				final Long minLatestBlockTimestamp = Controller.getMinimumLatestBlockTimestamp();
-				final Long peerLastBlockTimestamp = peer.getChainTipData().getLastBlockTimestamp();
+				final Long peerLastBlockTimestamp = peer.getChainTipData().getTimestamp();
 				if (peerLastBlockTimestamp == null || peerLastBlockTimestamp < minLatestBlockTimestamp) {
 					LOGGER.info(String.format("Peer %s is out of date, so abandoning sync attempt", peer));
 					return SynchronizationResult.CHAIN_TIP_TOO_OLD;
@@ -1443,6 +1478,12 @@ public class Synchronizer extends Thread {
 
 			repository.saveChanges();
 
+			synchronized (this.syncLock) {
+				if (peer.getChainTipData() != null) {
+					this.blocksRemaining = peer.getChainTipData().getHeight() - newBlock.getBlockData().getHeight();
+				}
+			}
+
 			Controller.getInstance().onNewBlock(newBlock.getBlockData());
 		}
 
@@ -1538,6 +1579,12 @@ public class Synchronizer extends Thread {
 
 			repository.saveChanges();
 
+			synchronized (this.syncLock) {
+				if (peer.getChainTipData() != null) {
+					this.blocksRemaining = peer.getChainTipData().getHeight() - newBlock.getBlockData().getHeight();
+				}
+			}
+
 			Controller.getInstance().onNewBlock(newBlock.getBlockData());
 		}
 
@@ -1548,12 +1595,19 @@ public class Synchronizer extends Thread {
 		Message getBlockSummariesMessage = new GetBlockSummariesMessage(parentSignature, numberRequested);
 
 		Message message = peer.getResponse(getBlockSummariesMessage);
-		if (message == null || message.getType() != MessageType.BLOCK_SUMMARIES)
+		if (message == null)
 			return null;
 
-		BlockSummariesMessage blockSummariesMessage = (BlockSummariesMessage) message;
+		if (message.getType() == MessageType.BLOCK_SUMMARIES) {
+			BlockSummariesMessage blockSummariesMessage = (BlockSummariesMessage) message;
+			return blockSummariesMessage.getBlockSummaries();
+		}
+		else if (message.getType() == MessageType.BLOCK_SUMMARIES_V2) {
+			BlockSummariesV2Message blockSummariesMessage = (BlockSummariesV2Message) message;
+			return blockSummariesMessage.getBlockSummaries();
+		}
 
-		return blockSummariesMessage.getBlockSummaries();
+		return null;
 	}
 
 	private List<byte[]> getBlockSignatures(Peer peer, byte[] parentSignature, int numberRequested) throws InterruptedException {
@@ -1572,8 +1626,20 @@ public class Synchronizer extends Thread {
 		Message getBlockMessage = new GetBlockMessage(signature);
 
 		Message message = peer.getResponse(getBlockMessage);
-		if (message == null)
+		if (message == null) {
+			peer.getPeerData().incrementFailedSyncCount();
+			if (peer.getPeerData().getFailedSyncCount() >= MAX_CONSECUTIVE_FAILED_SYNC_ATTEMPTS) {
+				// Several failed attempts, so mark peer as misbehaved
+				LOGGER.info("Marking peer {} as misbehaved due to {} failed sync attempts", peer, peer.getPeerData().getFailedSyncCount());
+				Network.getInstance().peerMisbehaved(peer);
+			}
 			return null;
+		}
+
+		// Reset failed sync count now that we have a block response
+		// FUTURE: we could move this to the end of the sync process, but to reduce risk this can be done
+		// at a later stage. For now we are only defending against serialization errors or no responses.
+		peer.getPeerData().setFailedSyncCount(0);
 
 		switch (message.getType()) {
 			case BLOCK: {

src/main/java/org/qortal/controller/arbitrary/ArbitraryDataFileListManager.java

@@ -67,6 +67,9 @@ public class ArbitraryDataFileListManager {
     /** Maximum number of hops that a file list relay request is allowed to make */
     public static int RELAY_REQUEST_MAX_HOPS = 4;
 
+    /** Minimum peer version to use relay */
+    public static String RELAY_MIN_PEER_VERSION = "3.4.0";
+
 
     private ArbitraryDataFileListManager() {
     }
@@ -120,12 +123,22 @@ public class ArbitraryDataFileListManager {
             }
         }
 
-        // Then allow another 5 attempts, each 5 minutes apart
+        // Then allow another 3 attempts, each 5 minutes apart
         if (timeSinceLastAttempt > 5 * 60 * 1000L) {
             // We haven't tried for at least 5 minutes
 
-            if (networkBroadcastCount < 5) {
+            if (networkBroadcastCount < 6) {
-                // We've made less than 5 total attempts
+                // We've made less than 6 total attempts
+                return true;
+            }
+        }
+
+        // Then allow another 4 attempts, each 30 minutes apart
+        if (timeSinceLastAttempt > 30 * 60 * 1000L) {
+            // We haven't tried for at least 5 minutes
+
+            if (networkBroadcastCount < 10) {
+                // We've made less than 10 total attempts
                 return true;
             }
         }
@@ -184,8 +197,8 @@ public class ArbitraryDataFileListManager {
             }
         }
 
-        if (timeSinceLastAttempt > 24 * 60 * 60 * 1000L) {
+        if (timeSinceLastAttempt > 60 * 60 * 1000L) {
-            // We haven't tried for at least 24 hours
+            // We haven't tried for at least 1 hour
             return true;
         }
 
@@ -524,6 +537,7 @@ public class ArbitraryDataFileListManager {
                         forwardArbitraryDataFileListMessage = new ArbitraryDataFileListMessage(signature, hashes, requestTime, requestHops,
                                 arbitraryDataFileListMessage.getPeerAddress(), arbitraryDataFileListMessage.isRelayPossible());
                     }
+                    forwardArbitraryDataFileListMessage.setId(message.getId());
 
                     // Forward to requesting peer
                     LOGGER.debug("Forwarding file list with {} hashes to requesting peer: {}", hashes.size(), requestingPeer);
@@ -694,9 +708,10 @@ public class ArbitraryDataFileListManager {
 
                     LOGGER.debug("Rebroadcasting hash list request from peer {} for signature {} to our other peers... totalRequestTime: {}, requestHops: {}", peer, Base58.encode(signature), totalRequestTime, requestHops);
                     Network.getInstance().broadcast(
-                            broadcastPeer -> broadcastPeer == peer ||
+                            broadcastPeer ->
-                                    Objects.equals(broadcastPeer.getPeerData().getAddress().getHost(), peer.getPeerData().getAddress().getHost())
+                                    !broadcastPeer.isAtLeastVersion(RELAY_MIN_PEER_VERSION) ? null :
-                                    ? null : relayGetArbitraryDataFileListMessage);
+                                    broadcastPeer == peer || Objects.equals(broadcastPeer.getPeerData().getAddress().getHost(), peer.getPeerData().getAddress().getHost()) ? null : relayGetArbitraryDataFileListMessage
+                    );
 
                 }
                 else {

src/main/java/org/qortal/controller/arbitrary/ArbitraryDataFileManager.java

@@ -82,7 +82,7 @@ public class ArbitraryDataFileManager extends Thread {
 
         try {
             // Use a fixed thread pool to execute the arbitrary data file requests
-            int threadCount = 10;
+            int threadCount = 5;
             ExecutorService arbitraryDataFileRequestExecutor = Executors.newFixedThreadPool(threadCount);
             for (int i = 0; i < threadCount; i++) {
                 arbitraryDataFileRequestExecutor.execute(new ArbitraryDataFileRequestThread());
@@ -288,7 +288,7 @@ public class ArbitraryDataFileManager extends Thread {
         // The ID needs to match that of the original request
         message.setId(originalMessage.getId());
 
-        if (!requestingPeer.sendMessage(message)) {
+        if (!requestingPeer.sendMessageWithTimeout(message, (int) ArbitraryDataManager.ARBITRARY_REQUEST_TIMEOUT)) {
             LOGGER.debug("Failed to forward arbitrary data file to peer {}", requestingPeer);
             requestingPeer.disconnect("failed to forward arbitrary data file");
         }
@@ -564,13 +564,16 @@ public class ArbitraryDataFileManager extends Thread {
                 LOGGER.trace("Hash {} exists", hash58);
 
                 // We can serve the file directly as we already have it
+                LOGGER.debug("Sending file {}...", arbitraryDataFile);
                 ArbitraryDataFileMessage arbitraryDataFileMessage = new ArbitraryDataFileMessage(signature, arbitraryDataFile);
                 arbitraryDataFileMessage.setId(message.getId());
-                if (!peer.sendMessage(arbitraryDataFileMessage)) {
+                if (!peer.sendMessageWithTimeout(arbitraryDataFileMessage, (int) ArbitraryDataManager.ARBITRARY_REQUEST_TIMEOUT)) {
-                    LOGGER.debug("Couldn't sent file");
+                    LOGGER.debug("Couldn't send file {}", arbitraryDataFile);
                     peer.disconnect("failed to send file");
                 }
-                LOGGER.debug("Sent file {}", arbitraryDataFile);
+                else {
+                    LOGGER.debug("Sent file {}", arbitraryDataFile);
+                }
             }
             else if (relayInfo != null) {
                 LOGGER.debug("We have relay info for hash {}", Base58.encode(hash));
@@ -595,9 +598,10 @@ public class ArbitraryDataFileManager extends Thread {
                 // Send valid, yet unexpected message type in response, so peer's synchronizer doesn't have to wait for timeout
                 LOGGER.debug(String.format("Sending 'file unknown' response to peer %s for GET_FILE request for unknown file %s", peer, arbitraryDataFile));
 
-                // We'll send empty block summaries message as it's very short
+                // Send generic 'unknown' message as it's very short
-                // TODO: use a different message type here
+                Message fileUnknownMessage = peer.getPeersVersion() >= GenericUnknownMessage.MINIMUM_PEER_VERSION
-                Message fileUnknownMessage = new BlockSummariesMessage(Collections.emptyList());
+                        ? new GenericUnknownMessage()
+                        : new BlockSummariesMessage(Collections.emptyList());
                 fileUnknownMessage.setId(message.getId());
                 if (!peer.sendMessage(fileUnknownMessage)) {
                     LOGGER.debug("Couldn't sent file-unknown response");

src/main/java/org/qortal/controller/arbitrary/ArbitraryDataStorageManager.java

@@ -48,7 +48,6 @@ public class ArbitraryDataStorageManager extends Thread {
     private List<ArbitraryTransactionData> hostedTransactions;
 
     private String searchQuery;
-    private List<ArbitraryTransactionData> searchResultsTransactions;
 
     private static final long DIRECTORY_SIZE_CHECK_INTERVAL = 10 * 60 * 1000L; // 10 minutes
 
@@ -344,11 +343,6 @@ public class ArbitraryDataStorageManager extends Thread {
      */
 
     public List<ArbitraryTransactionData> searchHostedTransactions(Repository repository, String query, Integer limit, Integer offset) {
-        // Load from results cache if we can (results that exists for the same query), to avoid disk reads
-        if (this.searchResultsTransactions != null && this.searchQuery.equals(query.toLowerCase())) {
-            return ArbitraryTransactionUtils.limitOffsetTransactions(this.searchResultsTransactions, limit, offset);
-        }
-
         // Using cache if we can, to avoid disk reads
         if (this.hostedTransactions == null) {
             this.hostedTransactions = this.loadAllHostedTransactions(repository);
@@ -376,10 +370,7 @@ public class ArbitraryDataStorageManager extends Thread {
         // Sort by newest first
         searchResultsList.sort(Comparator.comparingLong(ArbitraryTransactionData::getTimestamp).reversed());
 
-        // Update cache
+        return ArbitraryTransactionUtils.limitOffsetTransactions(searchResultsList, limit, offset);
-        this.searchResultsTransactions = searchResultsList;
-
-        return ArbitraryTransactionUtils.limitOffsetTransactions(this.searchResultsTransactions, limit, offset);
     }
 
     /**

src/main/java/org/qortal/controller/arbitrary/ArbitraryMetadataManager.java

@@ -22,8 +22,7 @@ import org.qortal.utils.Triple;
 import java.io.IOException;
 import java.util.*;
 
-import static org.qortal.controller.arbitrary.ArbitraryDataFileListManager.RELAY_REQUEST_MAX_DURATION;
+import static org.qortal.controller.arbitrary.ArbitraryDataFileListManager.*;
-import static org.qortal.controller.arbitrary.ArbitraryDataFileListManager.RELAY_REQUEST_MAX_HOPS;
 
 public class ArbitraryMetadataManager {
 
@@ -435,12 +434,13 @@ public class ArbitraryMetadataManager {
                     // Relay request hasn't reached the maximum number of hops yet, so can be rebroadcast
 
                     Message relayGetArbitraryMetadataMessage = new GetArbitraryMetadataMessage(signature, requestTime, requestHops);
+                    relayGetArbitraryMetadataMessage.setId(message.getId());
 
                     LOGGER.debug("Rebroadcasting metadata request from peer {} for signature {} to our other peers... totalRequestTime: {}, requestHops: {}", peer, Base58.encode(signature), totalRequestTime, requestHops);
                     Network.getInstance().broadcast(
-                            broadcastPeer -> broadcastPeer == peer ||
+                            broadcastPeer ->
-                                    Objects.equals(broadcastPeer.getPeerData().getAddress().getHost(), peer.getPeerData().getAddress().getHost())
+                                    !broadcastPeer.isAtLeastVersion(RELAY_MIN_PEER_VERSION) ? null :
-                                    ? null : relayGetArbitraryMetadataMessage);
+                                    broadcastPeer == peer || Objects.equals(broadcastPeer.getPeerData().getAddress().getHost(), peer.getPeerData().getAddress().getHost()) ? null : relayGetArbitraryMetadataMessage);
 
                 }
                 else {

src/main/java/org/qortal/controller/repository/AtStatesPruner.java

@@ -42,6 +42,7 @@ public class AtStatesPruner implements Runnable {
 
 			repository.discardChanges();
 			repository.getATRepository().rebuildLatestAtStates();
+			repository.saveChanges();
 
 			while (!Controller.isStopping()) {
 				repository.discardChanges();

src/main/java/org/qortal/controller/repository/AtStatesTrimmer.java

@@ -29,6 +29,7 @@ public class AtStatesTrimmer implements Runnable {
 
 			repository.discardChanges();
 			repository.getATRepository().rebuildLatestAtStates();
+			repository.saveChanges();
 
 			while (!Controller.isStopping()) {
 				repository.discardChanges();

src/main/java/org/qortal/controller/repository/BlockArchiver.java

@@ -16,7 +16,7 @@ public class BlockArchiver implements Runnable {
 
 	private static final Logger LOGGER = LogManager.getLogger(BlockArchiver.class);
 
-	private static final long INITIAL_SLEEP_PERIOD = 0L; // TODO: 5 * 60 * 1000L + 1234L; // ms
+	private static final long INITIAL_SLEEP_PERIOD = 5 * 60 * 1000L + 1234L; // ms
 
 	public void run() {
 		Thread.currentThread().setName("Block archiver");

src/main/java/org/qortal/controller/repository/NamesDatabaseIntegrityCheck.java

@@ -102,6 +102,21 @@ public class NamesDatabaseIntegrityCheck {
                     }
                 }
 
+                // Process CANCEL_SELL_NAME transactions
+                if (currentTransaction.getType() == TransactionType.CANCEL_SELL_NAME) {
+                    CancelSellNameTransactionData cancelSellNameTransactionData = (CancelSellNameTransactionData) currentTransaction;
+                    Name nameObj = new Name(repository, cancelSellNameTransactionData.getName());
+                    if (nameObj != null && nameObj.getNameData() != null) {
+                        nameObj.cancelSell(cancelSellNameTransactionData);
+                        modificationCount++;
+                        LOGGER.trace("Processed CANCEL_SELL_NAME transaction for name {}", name);
+                    }
+                    else {
+                        // Something went wrong
+                        throw new DataException(String.format("Name data not found for name %s", cancelSellNameTransactionData.getName()));
+                    }
+                }
+
                 // Process BUY_NAME transactions
                 if (currentTransaction.getType() == TransactionType.BUY_NAME) {
                     BuyNameTransactionData buyNameTransactionData = (BuyNameTransactionData) currentTransaction;
@@ -128,7 +143,7 @@ public class NamesDatabaseIntegrityCheck {
     public int rebuildAllNames() {
         int modificationCount = 0;
         try (final Repository repository = RepositoryManager.getRepository()) {
-            List<String> names = this.fetchAllNames(repository);
+            List<String> names = this.fetchAllNames(repository); // TODO: de-duplicate, to speed up this process
             for (String name : names) {
                 modificationCount += this.rebuildName(name, repository);
             }
@@ -326,6 +341,10 @@ public class NamesDatabaseIntegrityCheck {
                 TransactionType.BUY_NAME, Arrays.asList("name = ?"), Arrays.asList(name));
         signatures.addAll(buyNameTransactions);
 
+        List<byte[]> cancelSellNameTransactions = repository.getTransactionRepository().getSignaturesMatchingCustomCriteria(
+                TransactionType.CANCEL_SELL_NAME, Arrays.asList("name = ?"), Arrays.asList(name));
+        signatures.addAll(cancelSellNameTransactions);
+
         List<TransactionData> transactions = new ArrayList<>();
         for (byte[] signature : signatures) {
             TransactionData transactionData = repository.getTransactionRepository().fromSignature(signature);
@@ -390,6 +409,12 @@ public class NamesDatabaseIntegrityCheck {
                     names.add(sellNameTransactionData.getName());
                 }
             }
+            if ((transactionData instanceof CancelSellNameTransactionData)) {
+                CancelSellNameTransactionData cancelSellNameTransactionData = (CancelSellNameTransactionData) transactionData;
+                if (!names.contains(cancelSellNameTransactionData.getName())) {
+                    names.add(cancelSellNameTransactionData.getName());
+                }
+            }
         }
         return names;
     }

src/main/java/org/qortal/controller/tradebot/LitecoinACCTv2TradeBot.java

@@ -1,885 +0,0 @@
-package org.qortal.controller.tradebot;
-
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
-import org.bitcoinj.core.*;
-import org.bitcoinj.script.Script.ScriptType;
-import org.qortal.account.PrivateKeyAccount;
-import org.qortal.account.PublicKeyAccount;
-import org.qortal.api.model.crosschain.TradeBotCreateRequest;
-import org.qortal.asset.Asset;
-import org.qortal.crosschain.*;
-import org.qortal.crypto.Crypto;
-import org.qortal.data.at.ATData;
-import org.qortal.data.crosschain.CrossChainTradeData;
-import org.qortal.data.crosschain.TradeBotData;
-import org.qortal.data.transaction.BaseTransactionData;
-import org.qortal.data.transaction.DeployAtTransactionData;
-import org.qortal.data.transaction.MessageTransactionData;
-import org.qortal.group.Group;
-import org.qortal.repository.DataException;
-import org.qortal.repository.Repository;
-import org.qortal.transaction.DeployAtTransaction;
-import org.qortal.transaction.MessageTransaction;
-import org.qortal.transaction.Transaction.ValidationResult;
-import org.qortal.transform.TransformationException;
-import org.qortal.transform.transaction.DeployAtTransactionTransformer;
-import org.qortal.utils.Base58;
-import org.qortal.utils.NTP;
-
-import java.util.Arrays;
-import java.util.List;
-import java.util.Map;
-import java.util.stream.Collectors;
-
-import static java.util.Arrays.stream;
-import static java.util.stream.Collectors.toMap;
-
-/**
- * Performing cross-chain trading steps on behalf of user.
- * <p>
- * We deal with three different independent state-spaces here:
- * <ul>
- * 	<li>Qortal blockchain</li>
- * 	<li>Foreign blockchain</li>
- * 	<li>Trade-bot entries</li>
- * </ul>
- */
-public class LitecoinACCTv2TradeBot implements AcctTradeBot {
-
-	private static final Logger LOGGER = LogManager.getLogger(LitecoinACCTv2TradeBot.class);
-
-	public enum State implements TradeBot.StateNameAndValueSupplier {
-		BOB_WAITING_FOR_AT_CONFIRM(10, false, false),
-		BOB_WAITING_FOR_MESSAGE(15, true, true),
-		BOB_WAITING_FOR_AT_REDEEM(25, true, true),
-		BOB_DONE(30, false, false),
-		BOB_REFUNDED(35, false, false),
-
-		ALICE_WAITING_FOR_AT_LOCK(85, true, true),
-		ALICE_DONE(95, false, false),
-		ALICE_REFUNDING_A(105, true, true),
-		ALICE_REFUNDED(110, false, false);
-
-		private static final Map<Integer, State> map = stream(State.values()).collect(toMap(state -> state.value, state -> state));
-
-		public final int value;
-		public final boolean requiresAtData;
-		public final boolean requiresTradeData;
-
-		State(int value, boolean requiresAtData, boolean requiresTradeData) {
-			this.value = value;
-			this.requiresAtData = requiresAtData;
-			this.requiresTradeData = requiresTradeData;
-		}
-
-		public static State valueOf(int value) {
-			return map.get(value);
-		}
-
-		@Override
-		public String getState() {
-			return this.name();
-		}
-
-		@Override
-		public int getStateValue() {
-			return this.value;
-		}
-	}
-
-	/** Maximum time Bob waits for his AT creation transaction to be confirmed into a block. (milliseconds) */
-	private static final long MAX_AT_CONFIRMATION_PERIOD = 24 * 60 * 60 * 1000L; // ms
-
-	private static LitecoinACCTv2TradeBot instance;
-
-	private final List<String> endStates = Arrays.asList(State.BOB_DONE, State.BOB_REFUNDED, State.ALICE_DONE, State.ALICE_REFUNDING_A, State.ALICE_REFUNDED).stream()
-			.map(State::name)
-			.collect(Collectors.toUnmodifiableList());
-
-	private LitecoinACCTv2TradeBot() {
-	}
-
-	public static synchronized LitecoinACCTv2TradeBot getInstance() {
-		if (instance == null)
-			instance = new LitecoinACCTv2TradeBot();
-
-		return instance;
-	}
-
-	@Override
-	public List<String> getEndStates() {
-		return this.endStates;
-	}
-
-	/**
-	 * Creates a new trade-bot entry from the "Bob" viewpoint, i.e. OFFERing QORT in exchange for LTC.
-	 * <p>
-	 * Generates:
-	 * <ul>
-	 * 	<li>new 'trade' private key</li>
-	 * </ul>
-	 * Derives:
-	 * <ul>
-	 * 	<li>'native' (as in Qortal) public key, public key hash, address (starting with Q)</li>
-	 * 	<li>'foreign' (as in Litecoin) public key, public key hash</li>
-	 * </ul>
-	 * A Qortal AT is then constructed including the following as constants in the 'data segment':
-	 * <ul>
-	 * 	<li>'native'/Qortal 'trade' address - used as a MESSAGE contact</li>
-	 * 	<li>'foreign'/Litecoin public key hash - used by Alice's P2SH scripts to allow redeem</li>
-	 * 	<li>QORT amount on offer by Bob</li>
-	 * 	<li>LTC amount expected in return by Bob (from Alice)</li>
-	 * 	<li>trading timeout, in case things go wrong and everyone needs to refund</li>
-	 * </ul>
-	 * Returns a DEPLOY_AT transaction that needs to be signed and broadcast to the Qortal network.
-	 * <p>
-	 * Trade-bot will wait for Bob's AT to be deployed before taking next step.
-	 * <p>
-	 * @param repository
-	 * @param tradeBotCreateRequest
-	 * @return raw, unsigned DEPLOY_AT transaction
-	 * @throws DataException
-	 */
-	public byte[] createTrade(Repository repository, TradeBotCreateRequest tradeBotCreateRequest) throws DataException {
-		byte[] tradePrivateKey = TradeBot.generateTradePrivateKey();
-
-		byte[] tradeNativePublicKey = TradeBot.deriveTradeNativePublicKey(tradePrivateKey);
-		byte[] tradeNativePublicKeyHash = Crypto.hash160(tradeNativePublicKey);
-		String tradeNativeAddress = Crypto.toAddress(tradeNativePublicKey);
-
-		byte[] tradeForeignPublicKey = TradeBot.deriveTradeForeignPublicKey(tradePrivateKey);
-		byte[] tradeForeignPublicKeyHash = Crypto.hash160(tradeForeignPublicKey);
-
-		// Convert Litecoin receiving address into public key hash (we only support P2PKH at this time)
-		Address litecoinReceivingAddress;
-		try {
-			litecoinReceivingAddress = Address.fromString(Litecoin.getInstance().getNetworkParameters(), tradeBotCreateRequest.receivingAddress);
-		} catch (AddressFormatException e) {
-			throw new DataException("Unsupported Litecoin receiving address: " + tradeBotCreateRequest.receivingAddress);
-		}
-		if (litecoinReceivingAddress.getOutputScriptType() != ScriptType.P2PKH)
-			throw new DataException("Unsupported Litecoin receiving address: " + tradeBotCreateRequest.receivingAddress);
-
-		byte[] litecoinReceivingAccountInfo = litecoinReceivingAddress.getHash();
-
-		PublicKeyAccount creator = new PublicKeyAccount(repository, tradeBotCreateRequest.creatorPublicKey);
-
-		// Deploy AT
-		long timestamp = NTP.getTime();
-		byte[] reference = creator.getLastReference();
-		long fee = 0L;
-		byte[] signature = null;
-		BaseTransactionData baseTransactionData = new BaseTransactionData(timestamp, Group.NO_GROUP, reference, creator.getPublicKey(), fee, signature);
-
-		String name = "QORT/LTC ACCT";
-		String description = "QORT/LTC cross-chain trade";
-		String aTType = "ACCT";
-		String tags = "ACCT QORT LTC";
-		byte[] creationBytes = LitecoinACCTv2.buildQortalAT(tradeNativeAddress, tradeForeignPublicKeyHash, tradeBotCreateRequest.qortAmount,
-				tradeBotCreateRequest.foreignAmount, tradeBotCreateRequest.tradeTimeout);
-		long amount = tradeBotCreateRequest.fundingQortAmount;
-
-		DeployAtTransactionData deployAtTransactionData = new DeployAtTransactionData(baseTransactionData, name, description, aTType, tags, creationBytes, amount, Asset.QORT);
-
-		DeployAtTransaction deployAtTransaction = new DeployAtTransaction(repository, deployAtTransactionData);
-		fee = deployAtTransaction.calcRecommendedFee();
-		deployAtTransactionData.setFee(fee);
-
-		DeployAtTransaction.ensureATAddress(deployAtTransactionData);
-		String atAddress = deployAtTransactionData.getAtAddress();
-
-		TradeBotData tradeBotData =  new TradeBotData(tradePrivateKey, LitecoinACCTv2.NAME,
-				State.BOB_WAITING_FOR_AT_CONFIRM.name(), State.BOB_WAITING_FOR_AT_CONFIRM.value,
-				creator.getAddress(), atAddress, timestamp, tradeBotCreateRequest.qortAmount,
-				tradeNativePublicKey, tradeNativePublicKeyHash, tradeNativeAddress,
-				null, null,
-				SupportedBlockchain.LITECOIN.name(),
-				tradeForeignPublicKey, tradeForeignPublicKeyHash,
-				tradeBotCreateRequest.foreignAmount, null, null, null, litecoinReceivingAccountInfo);
-
-		TradeBot.updateTradeBotState(repository, tradeBotData, () -> String.format("Built AT %s. Waiting for deployment", atAddress));
-
-		// Attempt to backup the trade bot data
-		TradeBot.backupTradeBotData(repository, null);
-
-		// Return to user for signing and broadcast as we don't have their Qortal private key
-		try {
-			return DeployAtTransactionTransformer.toBytes(deployAtTransactionData);
-		} catch (TransformationException e) {
-			throw new DataException("Failed to transform DEPLOY_AT transaction?", e);
-		}
-	}
-
-	/**
-	 * Creates a trade-bot entry from the 'Alice' viewpoint, i.e. matching LTC to an existing offer.
-	 * <p>
-	 * Requires a chosen trade offer from Bob, passed by <tt>crossChainTradeData</tt>
-	 * and access to a Litecoin wallet via <tt>xprv58</tt>.
-	 * <p>
-	 * The <tt>crossChainTradeData</tt> contains the current trade offer state
-	 * as extracted from the AT's data segment.
-	 * <p>
-	 * Access to a funded wallet is via a Litecoin BIP32 hierarchical deterministic key,
-	 * passed via <tt>xprv58</tt>.
-	 * <b>This key will be stored in your node's database</b>
-	 * to allow trade-bot to create/fund the necessary P2SH transactions!
-	 * However, due to the nature of BIP32 keys, it is possible to give the trade-bot
-	 * only a subset of wallet access (see BIP32 for more details).
-	 * <p>
-	 * As an example, the xprv58 can be extract from a <i>legacy, password-less</i>
-	 * Electrum wallet by going to the console tab and entering:<br>
-	 * <tt>wallet.keystore.xprv</tt><br>
-	 * which should result in a base58 string starting with either 'xprv' (for Litecoin main-net)
-	 * or 'tprv' for (Litecoin test-net).
-	 * <p>
-	 * It is envisaged that the value in <tt>xprv58</tt> will actually come from a Qortal-UI-managed wallet.
-	 * <p>
-	 * If sufficient funds are available, <b>this method will actually fund the P2SH-A</b>
-	 * with the Litecoin amount expected by 'Bob'.
-	 * <p>
-	 * If the Litecoin transaction is successfully broadcast to the network then
-	 * we also send a MESSAGE to Bob's trade-bot to let them know.
-	 * <p>
-	 * The trade-bot entry is saved to the repository and the cross-chain trading process commences.
-	 * <p>
-	 * @param repository
-	 * @param crossChainTradeData chosen trade OFFER that Alice wants to match
-	 * @param xprv58 funded wallet xprv in base58
-	 * @return true if P2SH-A funding transaction successfully broadcast to Litecoin network, false otherwise
-	 * @throws DataException
-	 */
-	public ResponseResult startResponse(Repository repository, ATData atData, ACCT acct, CrossChainTradeData crossChainTradeData, String xprv58, String receivingAddress) throws DataException {
-		byte[] tradePrivateKey = TradeBot.generateTradePrivateKey();
-		byte[] secretA = TradeBot.generateSecret();
-		byte[] hashOfSecretA = Crypto.hash160(secretA);
-
-		byte[] tradeNativePublicKey = TradeBot.deriveTradeNativePublicKey(tradePrivateKey);
-		byte[] tradeNativePublicKeyHash = Crypto.hash160(tradeNativePublicKey);
-		String tradeNativeAddress = Crypto.toAddress(tradeNativePublicKey);
-
-		byte[] tradeForeignPublicKey = TradeBot.deriveTradeForeignPublicKey(tradePrivateKey);
-		byte[] tradeForeignPublicKeyHash = Crypto.hash160(tradeForeignPublicKey);
-		byte[] receivingPublicKeyHash = Base58.decode(receivingAddress); // Actually the whole address, not just PKH
-
-		// We need to generate lockTime-A: add tradeTimeout to now
-		long now = NTP.getTime();
-		int lockTimeA = crossChainTradeData.tradeTimeout * 60 + (int) (now / 1000L);
-
-		TradeBotData tradeBotData =  new TradeBotData(tradePrivateKey, LitecoinACCTv2.NAME,
-				State.ALICE_WAITING_FOR_AT_LOCK.name(), State.ALICE_WAITING_FOR_AT_LOCK.value,
-				receivingAddress, crossChainTradeData.qortalAtAddress, now, crossChainTradeData.qortAmount,
-				tradeNativePublicKey, tradeNativePublicKeyHash, tradeNativeAddress,
-				secretA, hashOfSecretA,
-				SupportedBlockchain.LITECOIN.name(),
-				tradeForeignPublicKey, tradeForeignPublicKeyHash,
-				crossChainTradeData.expectedForeignAmount, xprv58, null, lockTimeA, receivingPublicKeyHash);
-
-		// Attempt to backup the trade bot data
-		// Include tradeBotData as an additional parameter, since it's not in the repository yet
-		TradeBot.backupTradeBotData(repository, Arrays.asList(tradeBotData));
-
-		// Check we have enough funds via xprv58 to fund P2SH to cover expectedForeignAmount
-		long p2shFee;
-		try {
-			p2shFee = Litecoin.getInstance().getP2shFee(now);
-		} catch (ForeignBlockchainException e) {
-			LOGGER.debug("Couldn't estimate Litecoin fees?");
-			return ResponseResult.NETWORK_ISSUE;
-		}
-
-		// Fee for redeem/refund is subtracted from P2SH-A balance.
-		// Do not include fee for funding transaction as this is covered by buildSpend()
-		long amountA = crossChainTradeData.expectedForeignAmount + p2shFee /*redeeming/refunding P2SH-A*/;
-
-		// P2SH-A to be funded
-		byte[] redeemScriptBytes = BitcoinyHTLC.buildScript(tradeForeignPublicKeyHash, lockTimeA, crossChainTradeData.creatorForeignPKH, hashOfSecretA);
-		String p2shAddress = Litecoin.getInstance().deriveP2shAddress(redeemScriptBytes);
-
-		// Build transaction for funding P2SH-A
-		Transaction p2shFundingTransaction = Litecoin.getInstance().buildSpend(tradeBotData.getForeignKey(), p2shAddress, amountA);
-		if (p2shFundingTransaction == null) {
-			LOGGER.debug("Unable to build P2SH-A funding transaction - lack of funds?");
-			return ResponseResult.BALANCE_ISSUE;
-		}
-
-		try {
-			Litecoin.getInstance().broadcastTransaction(p2shFundingTransaction);
-		} catch (ForeignBlockchainException e) {
-			// We couldn't fund P2SH-A at this time
-			LOGGER.debug("Couldn't broadcast P2SH-A funding transaction?");
-			return ResponseResult.NETWORK_ISSUE;
-		}
-
-		// Attempt to send MESSAGE to Bob's Qortal trade address
-		byte[] messageData = LitecoinACCTv2.buildOfferMessage(tradeBotData.getTradeForeignPublicKeyHash(), tradeBotData.getHashOfSecret(), tradeBotData.getLockTimeA());
-		String messageRecipient = crossChainTradeData.qortalCreatorTradeAddress;
-
-		boolean isMessageAlreadySent = repository.getMessageRepository().exists(tradeBotData.getTradeNativePublicKey(), messageRecipient, messageData);
-		if (!isMessageAlreadySent) {
-			PrivateKeyAccount sender = new PrivateKeyAccount(repository, tradeBotData.getTradePrivateKey());
-			MessageTransaction messageTransaction = MessageTransaction.build(repository, sender, Group.NO_GROUP, messageRecipient, messageData, false, false);
-
-			messageTransaction.computeNonce();
-			messageTransaction.sign(sender);
-
-			// reset repository state to prevent deadlock
-			repository.discardChanges();
-			ValidationResult result = messageTransaction.importAsUnconfirmed();
-
-			if (result != ValidationResult.OK) {
-				LOGGER.warn(() -> String.format("Unable to send MESSAGE to Bob's trade-bot %s: %s", messageRecipient, result.name()));
-				return ResponseResult.NETWORK_ISSUE;
-			}
-		}
-
-		TradeBot.updateTradeBotState(repository, tradeBotData, () -> String.format("Funding P2SH-A %s. Messaged Bob. Waiting for AT-lock", p2shAddress));
-
-		return ResponseResult.OK;
-	}
-
-	@Override
-	public boolean canDelete(Repository repository, TradeBotData tradeBotData) throws DataException {
-		State tradeBotState = State.valueOf(tradeBotData.getStateValue());
-		if (tradeBotState == null)
-			return true;
-
-		// If the AT doesn't exist then we might as well let the user tidy up
-		if (!repository.getATRepository().exists(tradeBotData.getAtAddress()))
-			return true;
-
-		switch (tradeBotState) {
-			case BOB_WAITING_FOR_AT_CONFIRM:
-			case ALICE_DONE:
-			case BOB_DONE:
-			case ALICE_REFUNDED:
-			case BOB_REFUNDED:
-			case ALICE_REFUNDING_A:
-				return true;
-
-			default:
-				return false;
-		}
-	}
-
-	@Override
-	public void progress(Repository repository, TradeBotData tradeBotData) throws DataException, ForeignBlockchainException {
-		State tradeBotState = State.valueOf(tradeBotData.getStateValue());
-		if (tradeBotState == null) {
-			LOGGER.info(() -> String.format("Trade-bot entry for AT %s has invalid state?", tradeBotData.getAtAddress()));
-			return;
-		}
-
-		ATData atData = null;
-		CrossChainTradeData tradeData = null;
-
-		if (tradeBotState.requiresAtData) {
-			// Attempt to fetch AT data
-			atData = repository.getATRepository().fromATAddress(tradeBotData.getAtAddress());
-			if (atData == null) {
-				LOGGER.debug(() -> String.format("Unable to fetch trade AT %s from repository", tradeBotData.getAtAddress()));
-				return;
-			}
-
-			if (tradeBotState.requiresTradeData) {
-				tradeData = LitecoinACCTv2.getInstance().populateTradeData(repository, atData);
-				if (tradeData == null) {
-					LOGGER.warn(() -> String.format("Unable to fetch ACCT trade data for AT %s from repository", tradeBotData.getAtAddress()));
-					return;
-				}
-			}
-		}
-
-		switch (tradeBotState) {
-			case BOB_WAITING_FOR_AT_CONFIRM:
-				handleBobWaitingForAtConfirm(repository, tradeBotData);
-				break;
-
-			case BOB_WAITING_FOR_MESSAGE:
-				TradeBot.getInstance().updatePresence(repository, tradeBotData, tradeData);
-				handleBobWaitingForMessage(repository, tradeBotData, atData, tradeData);
-				break;
-
-			case ALICE_WAITING_FOR_AT_LOCK:
-				TradeBot.getInstance().updatePresence(repository, tradeBotData, tradeData);
-				handleAliceWaitingForAtLock(repository, tradeBotData, atData, tradeData);
-				break;
-
-			case BOB_WAITING_FOR_AT_REDEEM:
-				TradeBot.getInstance().updatePresence(repository, tradeBotData, tradeData);
-				handleBobWaitingForAtRedeem(repository, tradeBotData, atData, tradeData);
-				break;
-
-			case ALICE_DONE:
-			case BOB_DONE:
-				break;
-
-			case ALICE_REFUNDING_A:
-				TradeBot.getInstance().updatePresence(repository, tradeBotData, tradeData);
-				handleAliceRefundingP2shA(repository, tradeBotData, atData, tradeData);
-				break;
-
-			case ALICE_REFUNDED:
-			case BOB_REFUNDED:
-				break;
-		}
-	}
-
-	/**
-	 * Trade-bot is waiting for Bob's AT to deploy.
-	 * <p>
-	 * If AT is deployed, then trade-bot's next step is to wait for MESSAGE from Alice.
-	 */
-	private void handleBobWaitingForAtConfirm(Repository repository, TradeBotData tradeBotData) throws DataException {
-		if (!repository.getATRepository().exists(tradeBotData.getAtAddress())) {
-			if (NTP.getTime() - tradeBotData.getTimestamp() <= MAX_AT_CONFIRMATION_PERIOD)
-				return;
-
-			// We've waited ages for AT to be confirmed into a block but something has gone awry.
-			// After this long we assume transaction loss so give up with trade-bot entry too.
-			tradeBotData.setState(State.BOB_REFUNDED.name());
-			tradeBotData.setStateValue(State.BOB_REFUNDED.value);
-			tradeBotData.setTimestamp(NTP.getTime());
-			// We delete trade-bot entry here instead of saving, hence not using updateTradeBotState()
-			repository.getCrossChainRepository().delete(tradeBotData.getTradePrivateKey());
-			repository.saveChanges();
-
-			LOGGER.info(() -> String.format("AT %s never confirmed. Giving up on trade", tradeBotData.getAtAddress()));
-			TradeBot.notifyStateChange(tradeBotData);
-			return;
-		}
-
-		TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_WAITING_FOR_MESSAGE,
-				() -> String.format("AT %s confirmed ready. Waiting for trade message", tradeBotData.getAtAddress()));
-	}
-
-	/**
-	 * Trade-bot is waiting for MESSAGE from Alice's trade-bot, containing Alice's trade info.
-	 * <p>
-	 * It's possible Bob has cancelling his trade offer, receiving an automatic QORT refund,
-	 * in which case trade-bot is done with this specific trade and finalizes on refunded state.
-	 * <p>
-	 * Assuming trade is still on offer, trade-bot checks the contents of MESSAGE from Alice's trade-bot.
-	 * <p>
-	 * Details from Alice are used to derive P2SH-A address and this is checked for funding balance.
-	 * <p>
-	 * Assuming P2SH-A has at least expected Litecoin balance,
-	 * Bob's trade-bot constructs a zero-fee, PoW MESSAGE to send to Bob's AT with more trade details.
-	 * <p>
-	 * On processing this MESSAGE, Bob's AT should switch into 'TRADE' mode and only trade with Alice.
-	 * <p>
-	 * Trade-bot's next step is to wait for Alice to redeem the AT, which will allow Bob to
-	 * extract secret-A needed to redeem Alice's P2SH.
-	 * @throws ForeignBlockchainException
-	 */
-	private void handleBobWaitingForMessage(Repository repository, TradeBotData tradeBotData,
-			ATData atData, CrossChainTradeData crossChainTradeData) throws DataException, ForeignBlockchainException {
-		// If AT has finished then Bob likely cancelled his trade offer
-		if (atData.getIsFinished()) {
-			TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_REFUNDED,
-					() -> String.format("AT %s cancelled - trading aborted", tradeBotData.getAtAddress()));
-			return;
-		}
-
-		Litecoin litecoin = Litecoin.getInstance();
-
-		String address = tradeBotData.getTradeNativeAddress();
-		List<MessageTransactionData> messageTransactionsData = repository.getMessageRepository().getMessagesByParticipants(null, address, null, null, null);
-
-		for (MessageTransactionData messageTransactionData : messageTransactionsData) {
-			if (messageTransactionData.isText())
-				continue;
-
-			// We're expecting: HASH160(secret-A), Alice's Litecoin pubkeyhash and lockTime-A
-			byte[] messageData = messageTransactionData.getData();
-			LitecoinACCTv2.OfferMessageData offerMessageData = LitecoinACCTv2.extractOfferMessageData(messageData);
-			if (offerMessageData == null)
-				continue;
-
-			byte[] aliceForeignPublicKeyHash = offerMessageData.partnerLitecoinPKH;
-			byte[] hashOfSecretA = offerMessageData.hashOfSecretA;
-			int lockTimeA = (int) offerMessageData.lockTimeA;
-			long messageTimestamp = messageTransactionData.getTimestamp();
-			int refundTimeout = LitecoinACCTv2.calcRefundTimeout(messageTimestamp, lockTimeA);
-
-			// Determine P2SH-A address and confirm funded
-			byte[] redeemScriptA = BitcoinyHTLC.buildScript(aliceForeignPublicKeyHash, lockTimeA, tradeBotData.getTradeForeignPublicKeyHash(), hashOfSecretA);
-			String p2shAddressA = litecoin.deriveP2shAddress(redeemScriptA);
-
-			long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
-			long p2shFee = Litecoin.getInstance().getP2shFee(feeTimestamp);
-			final long minimumAmountA = tradeBotData.getForeignAmount() + p2shFee;
-
-			BitcoinyHTLC.Status htlcStatusA = BitcoinyHTLC.determineHtlcStatus(litecoin.getBlockchainProvider(), p2shAddressA, minimumAmountA);
-
-			switch (htlcStatusA) {
-				case UNFUNDED:
-				case FUNDING_IN_PROGRESS:
-					// There might be another MESSAGE from someone else with an actually funded P2SH-A...
-					continue;
-
-				case REDEEM_IN_PROGRESS:
-				case REDEEMED:
-					// We've already redeemed this?
-					TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_DONE,
-							() -> String.format("P2SH-A %s already spent? Assuming trade complete", p2shAddressA));
-					return;
-
-				case REFUND_IN_PROGRESS:
-				case REFUNDED:
-					// This P2SH-A is burnt, but there might be another MESSAGE from someone else with an actually funded P2SH-A...
-					continue;
-
-				case FUNDED:
-					// Fall-through out of switch...
-					break;
-			}
-
-			// Good to go - send MESSAGE to AT
-
-			String aliceNativeAddress = Crypto.toAddress(messageTransactionData.getCreatorPublicKey());
-
-			// Build outgoing message, padding each part to 32 bytes to make it easier for AT to consume
-			byte[] outgoingMessageData = LitecoinACCTv2.buildTradeMessage(aliceNativeAddress, aliceForeignPublicKeyHash, hashOfSecretA, lockTimeA, refundTimeout);
-			String messageRecipient = tradeBotData.getAtAddress();
-
-			boolean isMessageAlreadySent = repository.getMessageRepository().exists(tradeBotData.getTradeNativePublicKey(), messageRecipient, outgoingMessageData);
-			if (!isMessageAlreadySent) {
-				PrivateKeyAccount sender = new PrivateKeyAccount(repository, tradeBotData.getTradePrivateKey());
-				MessageTransaction outgoingMessageTransaction = MessageTransaction.build(repository, sender, Group.NO_GROUP, messageRecipient, outgoingMessageData, false, false);
-
-				outgoingMessageTransaction.computeNonce();
-				outgoingMessageTransaction.sign(sender);
-
-				// reset repository state to prevent deadlock
-				repository.discardChanges();
-				ValidationResult result = outgoingMessageTransaction.importAsUnconfirmed();
-
-				if (result != ValidationResult.OK) {
-					LOGGER.warn(() -> String.format("Unable to send MESSAGE to AT %s: %s", messageRecipient, result.name()));
-					return;
-				}
-			}
-
-			TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_WAITING_FOR_AT_REDEEM,
-					() -> String.format("Locked AT %s to %s. Waiting for AT redeem", tradeBotData.getAtAddress(), aliceNativeAddress));
-
-			return;
-		}
-	}
-
-	/**
-	 * Trade-bot is waiting for Bob's AT to switch to TRADE mode and lock trade to Alice only.
-	 * <p>
-	 * It's possible that Bob has cancelled his trade offer in the mean time, or that somehow
-	 * this process has taken so long that we've reached P2SH-A's locktime, or that someone else
-	 * has managed to trade with Bob. In any of these cases, trade-bot switches to begin the refunding process.
-	 * <p>
-	 * Assuming Bob's AT is locked to Alice, trade-bot checks AT's state data to make sure it is correct.
-	 * <p>
-	 * If all is well, trade-bot then redeems AT using Alice's secret-A, releasing Bob's QORT to Alice.
-	 * <p>
-	 * In revealing a valid secret-A, Bob can then redeem the LTC funds from P2SH-A.
-	 * <p>
-	 * @throws ForeignBlockchainException
-	 */
-	private void handleAliceWaitingForAtLock(Repository repository, TradeBotData tradeBotData,
-			ATData atData, CrossChainTradeData crossChainTradeData) throws DataException, ForeignBlockchainException {
-		if (aliceUnexpectedState(repository, tradeBotData, atData, crossChainTradeData))
-			return;
-
-		Litecoin litecoin = Litecoin.getInstance();
-		int lockTimeA = tradeBotData.getLockTimeA();
-
-		// Refund P2SH-A if we've passed lockTime-A
-		if (NTP.getTime() >= lockTimeA * 1000L) {
-			byte[] redeemScriptA = BitcoinyHTLC.buildScript(tradeBotData.getTradeForeignPublicKeyHash(), lockTimeA, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
-			String p2shAddressA = litecoin.deriveP2shAddress(redeemScriptA);
-
-			long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
-			long p2shFee = Litecoin.getInstance().getP2shFee(feeTimestamp);
-			long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
-
-			BitcoinyHTLC.Status htlcStatusA = BitcoinyHTLC.determineHtlcStatus(litecoin.getBlockchainProvider(), p2shAddressA, minimumAmountA);
-
-			switch (htlcStatusA) {
-				case UNFUNDED:
-				case FUNDING_IN_PROGRESS:
-				case FUNDED:
-					break;
-
-				case REDEEM_IN_PROGRESS:
-				case REDEEMED:
-					// Already redeemed?
-					TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_DONE,
-							() -> String.format("P2SH-A %s already spent? Assuming trade completed", p2shAddressA));
-					return;
-
-				case REFUND_IN_PROGRESS:
-				case REFUNDED:
-					TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDED,
-							() -> String.format("P2SH-A %s already refunded. Trade aborted", p2shAddressA));
-					return;
-
-			}
-
-			TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDING_A,
-					() -> atData.getIsFinished()
-					? String.format("AT %s cancelled. Refunding P2SH-A %s - aborting trade", tradeBotData.getAtAddress(), p2shAddressA)
-					: String.format("LockTime-A reached, refunding P2SH-A %s - aborting trade", p2shAddressA));
-
-			return;
-		}
-
-		// We're waiting for AT to be in TRADE mode
-		if (crossChainTradeData.mode != AcctMode.TRADING)
-			return;
-
-		// AT is in TRADE mode and locked to us as checked by aliceUnexpectedState() above
-
-		// Find our MESSAGE to AT from previous state
-		List<MessageTransactionData> messageTransactionsData = repository.getMessageRepository().getMessagesByParticipants(tradeBotData.getTradeNativePublicKey(),
-				crossChainTradeData.qortalCreatorTradeAddress, null, null, null);
-		if (messageTransactionsData == null || messageTransactionsData.isEmpty()) {
-			LOGGER.warn(() -> String.format("Unable to find our message to trade creator %s?", crossChainTradeData.qortalCreatorTradeAddress));
-			return;
-		}
-
-		long recipientMessageTimestamp = messageTransactionsData.get(0).getTimestamp();
-		int refundTimeout = LitecoinACCTv2.calcRefundTimeout(recipientMessageTimestamp, lockTimeA);
-
-		// Our calculated refundTimeout should match AT's refundTimeout
-		if (refundTimeout != crossChainTradeData.refundTimeout) {
-			LOGGER.debug(() -> String.format("Trade AT refundTimeout '%d' doesn't match our refundTimeout '%d'", crossChainTradeData.refundTimeout, refundTimeout));
-			// We'll eventually refund
-			return;
-		}
-
-		// We're good to redeem AT
-
-		// Send 'redeem' MESSAGE to AT using both secret
-		byte[] secretA = tradeBotData.getSecret();
-		String qortalReceivingAddress = Base58.encode(tradeBotData.getReceivingAccountInfo()); // Actually contains whole address, not just PKH
-		byte[] messageData = LitecoinACCTv2.buildRedeemMessage(secretA, qortalReceivingAddress);
-		String messageRecipient = tradeBotData.getAtAddress();
-
-		boolean isMessageAlreadySent = repository.getMessageRepository().exists(tradeBotData.getTradeNativePublicKey(), messageRecipient, messageData);
-		if (!isMessageAlreadySent) {
-			PrivateKeyAccount sender = new PrivateKeyAccount(repository, tradeBotData.getTradePrivateKey());
-			MessageTransaction messageTransaction = MessageTransaction.build(repository, sender, Group.NO_GROUP, messageRecipient, messageData, false, false);
-
-			messageTransaction.computeNonce();
-			messageTransaction.sign(sender);
-
-			// Reset repository state to prevent deadlock
-			repository.discardChanges();
-			ValidationResult result = messageTransaction.importAsUnconfirmed();
-
-			if (result != ValidationResult.OK) {
-				LOGGER.warn(() -> String.format("Unable to send MESSAGE to AT %s: %s", messageRecipient, result.name()));
-				return;
-			}
-		}
-
-		TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_DONE,
-				() -> String.format("Redeeming AT %s. Funds should arrive at %s",
-						tradeBotData.getAtAddress(), qortalReceivingAddress));
-	}
-
-	/**
-	 * Trade-bot is waiting for Alice to redeem Bob's AT, thus revealing secret-A which is required to spend the LTC funds from P2SH-A.
-	 * <p>
-	 * It's possible that Bob's AT has reached its trading timeout and automatically refunded QORT back to Bob. In which case,
-	 * trade-bot is done with this specific trade and finalizes in refunded state.
-	 * <p>
-	 * Assuming trade-bot can extract a valid secret-A from Alice's MESSAGE then trade-bot uses that to redeem the LTC funds from P2SH-A
-	 * to Bob's 'foreign'/Litecoin trade legacy-format address, as derived from trade private key.
-	 * <p>
-	 * (This could potentially be 'improved' to send LTC to any address of Bob's choosing by changing the transaction output).
-	 * <p>
-	 * If trade-bot successfully broadcasts the transaction, then this specific trade is done.
-	 * @throws ForeignBlockchainException
-	 */
-	private void handleBobWaitingForAtRedeem(Repository repository, TradeBotData tradeBotData,
-			ATData atData, CrossChainTradeData crossChainTradeData) throws DataException, ForeignBlockchainException {
-		// AT should be 'finished' once Alice has redeemed QORT funds
-		if (!atData.getIsFinished())
-			// Not finished yet
-			return;
-
-		// If AT is REFUNDED or CANCELLED then something has gone wrong
-		if (crossChainTradeData.mode == AcctMode.REFUNDED || crossChainTradeData.mode == AcctMode.CANCELLED) {
-			// Alice hasn't redeemed the QORT, so there is no point in trying to redeem the LTC
-			TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_REFUNDED,
-					() -> String.format("AT %s has auto-refunded - trade aborted", tradeBotData.getAtAddress()));
-
-			return;
-		}
-
-		byte[] secretA = LitecoinACCTv2.getInstance().findSecretA(repository, crossChainTradeData);
-		if (secretA == null) {
-			LOGGER.debug(() -> String.format("Unable to find secret-A from redeem message to AT %s?", tradeBotData.getAtAddress()));
-			return;
-		}
-
-		// Use secret-A to redeem P2SH-A
-
-		Litecoin litecoin = Litecoin.getInstance();
-
-		byte[] receivingAccountInfo = tradeBotData.getReceivingAccountInfo();
-		int lockTimeA = crossChainTradeData.lockTimeA;
-		byte[] redeemScriptA = BitcoinyHTLC.buildScript(crossChainTradeData.partnerForeignPKH, lockTimeA, crossChainTradeData.creatorForeignPKH, crossChainTradeData.hashOfSecretA);
-		String p2shAddressA = litecoin.deriveP2shAddress(redeemScriptA);
-
-		// Fee for redeem/refund is subtracted from P2SH-A balance.
-		long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
-		long p2shFee = Litecoin.getInstance().getP2shFee(feeTimestamp);
-		long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
-		BitcoinyHTLC.Status htlcStatusA = BitcoinyHTLC.determineHtlcStatus(litecoin.getBlockchainProvider(), p2shAddressA, minimumAmountA);
-
-		switch (htlcStatusA) {
-			case UNFUNDED:
-			case FUNDING_IN_PROGRESS:
-				// P2SH-A suddenly not funded? Our best bet at this point is to hope for AT auto-refund
-				return;
-
-			case REDEEM_IN_PROGRESS:
-			case REDEEMED:
-				// Double-check that we have redeemed P2SH-A...
-				break;
-
-			case REFUND_IN_PROGRESS:
-			case REFUNDED:
-				// Wait for AT to auto-refund
-				return;
-
-			case FUNDED: {
-				Coin redeemAmount = Coin.valueOf(crossChainTradeData.expectedForeignAmount);
-				ECKey redeemKey = ECKey.fromPrivate(tradeBotData.getTradePrivateKey());
-				List<TransactionOutput> fundingOutputs = litecoin.getUnspentOutputs(p2shAddressA);
-
-				Transaction p2shRedeemTransaction = BitcoinyHTLC.buildRedeemTransaction(litecoin.getNetworkParameters(), redeemAmount, redeemKey,
-						fundingOutputs, redeemScriptA, secretA, receivingAccountInfo);
-
-				litecoin.broadcastTransaction(p2shRedeemTransaction);
-				break;
-			}
-		}
-
-		String receivingAddress = litecoin.pkhToAddress(receivingAccountInfo);
-
-		TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_DONE,
-				() -> String.format("P2SH-A %s redeemed. Funds should arrive at %s", tradeBotData.getAtAddress(), receivingAddress));
-	}
-
-	/**
-	 * Trade-bot is attempting to refund P2SH-A.
-	 * @throws ForeignBlockchainException
-	 */
-	private void handleAliceRefundingP2shA(Repository repository, TradeBotData tradeBotData,
-			ATData atData, CrossChainTradeData crossChainTradeData) throws DataException, ForeignBlockchainException {
-		int lockTimeA = tradeBotData.getLockTimeA();
-
-		// We can't refund P2SH-A until lockTime-A has passed
-		if (NTP.getTime() <= lockTimeA * 1000L)
-			return;
-
-		Litecoin litecoin = Litecoin.getInstance();
-
-		// We can't refund P2SH-A until median block time has passed lockTime-A (see BIP113)
-		int medianBlockTime = litecoin.getMedianBlockTime();
-		if (medianBlockTime <= lockTimeA)
-			return;
-
-		byte[] redeemScriptA = BitcoinyHTLC.buildScript(tradeBotData.getTradeForeignPublicKeyHash(), lockTimeA, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
-		String p2shAddressA = litecoin.deriveP2shAddress(redeemScriptA);
-
-		// Fee for redeem/refund is subtracted from P2SH-A balance.
-		long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
-		long p2shFee = Litecoin.getInstance().getP2shFee(feeTimestamp);
-		long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
-		BitcoinyHTLC.Status htlcStatusA = BitcoinyHTLC.determineHtlcStatus(litecoin.getBlockchainProvider(), p2shAddressA, minimumAmountA);
-
-		switch (htlcStatusA) {
-			case UNFUNDED:
-			case FUNDING_IN_PROGRESS:
-				// Still waiting for P2SH-A to be funded...
-				return;
-
-			case REDEEM_IN_PROGRESS:
-			case REDEEMED:
-				// Too late!
-				TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_DONE,
-						() -> String.format("P2SH-A %s already spent!", p2shAddressA));
-				return;
-
-			case REFUND_IN_PROGRESS:
-			case REFUNDED:
-				break;
-
-			case FUNDED:{
-				Coin refundAmount = Coin.valueOf(crossChainTradeData.expectedForeignAmount);
-				ECKey refundKey = ECKey.fromPrivate(tradeBotData.getTradePrivateKey());
-				List<TransactionOutput> fundingOutputs = litecoin.getUnspentOutputs(p2shAddressA);
-
-				// Determine receive address for refund
-				String receiveAddress = litecoin.getUnusedReceiveAddress(tradeBotData.getForeignKey());
-				Address receiving = Address.fromString(litecoin.getNetworkParameters(), receiveAddress);
-
-				Transaction p2shRefundTransaction = BitcoinyHTLC.buildRefundTransaction(litecoin.getNetworkParameters(), refundAmount, refundKey,
-						fundingOutputs, redeemScriptA, lockTimeA, receiving.getHash());
-
-				litecoin.broadcastTransaction(p2shRefundTransaction);
-				break;
-			}
-		}
-
-		TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDED,
-				() -> String.format("LockTime-A reached. Refunded P2SH-A %s. Trade aborted", p2shAddressA));
-	}
-
-	/**
-	 * Returns true if Alice finds AT unexpectedly cancelled, refunded, redeemed or locked to someone else.
-	 * <p>
-	 * Will automatically update trade-bot state to <tt>ALICE_REFUNDING_A</tt> or <tt>ALICE_DONE</tt> as necessary.
-	 * 
-	 * @throws DataException
-	 * @throws ForeignBlockchainException
-	 */
-	private boolean aliceUnexpectedState(Repository repository, TradeBotData tradeBotData,
-			ATData atData, CrossChainTradeData crossChainTradeData) throws DataException, ForeignBlockchainException {
-		// This is OK
-		if (!atData.getIsFinished() && crossChainTradeData.mode == AcctMode.OFFERING)
-			return false;
-
-		boolean isAtLockedToUs = tradeBotData.getTradeNativeAddress().equals(crossChainTradeData.qortalPartnerAddress);
-
-		if (!atData.getIsFinished() && crossChainTradeData.mode == AcctMode.TRADING)
-			if (isAtLockedToUs) {
-				// AT is trading with us - OK
-				return false;
-			} else {
-				TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDING_A,
-						() -> String.format("AT %s trading with someone else: %s. Refunding & aborting trade", tradeBotData.getAtAddress(), crossChainTradeData.qortalPartnerAddress));
-
-				return true;
-			}
-
-		if (atData.getIsFinished() && crossChainTradeData.mode == AcctMode.REDEEMED && isAtLockedToUs) {
-			// We've redeemed already?
-			TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_DONE,
-					() -> String.format("AT %s already redeemed by us. Trade completed", tradeBotData.getAtAddress()));
-		} else {
-			// Any other state is not good, so start defensive refund
-			TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDING_A,
-					() -> String.format("AT %s cancelled/refunded/redeemed by someone else/invalid state. Refunding & aborting trade", tradeBotData.getAtAddress()));
-		}
-
-		return true;
-	}
-
-	private long calcFeeTimestamp(int lockTimeA, int tradeTimeout) {
-		return (lockTimeA - tradeTimeout * 60) * 1000L;
-	}
-
-}

src/main/java/org/qortal/controller/tradebot/LitecoinACCTv3TradeBot.java

@@ -19,6 +19,7 @@ import org.qortal.data.transaction.MessageTransactionData;
 import org.qortal.group.Group;
 import org.qortal.repository.DataException;
 import org.qortal.repository.Repository;
+import org.qortal.repository.RepositoryManager;
 import org.qortal.transaction.DeployAtTransaction;
 import org.qortal.transaction.MessageTransaction;
 import org.qortal.transaction.Transaction.ValidationResult;
@@ -317,20 +318,27 @@ public class LitecoinACCTv3TradeBot implements AcctTradeBot {
 
 		boolean isMessageAlreadySent = repository.getMessageRepository().exists(tradeBotData.getTradeNativePublicKey(), messageRecipient, messageData);
 		if (!isMessageAlreadySent) {
-			PrivateKeyAccount sender = new PrivateKeyAccount(repository, tradeBotData.getTradePrivateKey());
+			// Do this in a new thread so caller doesn't have to wait for computeNonce()
-			MessageTransaction messageTransaction = MessageTransaction.build(repository, sender, Group.NO_GROUP, messageRecipient, messageData, false, false);
+			// In the unlikely event that the transaction doesn't validate then the buy won't happen and eventually Alice's AT will be refunded
+			new Thread(() -> {
+				try (final Repository threadsRepository = RepositoryManager.getRepository()) {
+					PrivateKeyAccount sender = new PrivateKeyAccount(threadsRepository, tradeBotData.getTradePrivateKey());
+					MessageTransaction messageTransaction = MessageTransaction.build(threadsRepository, sender, Group.NO_GROUP, messageRecipient, messageData, false, false);
 
-			messageTransaction.computeNonce();
+					messageTransaction.computeNonce();
-			messageTransaction.sign(sender);
+					messageTransaction.sign(sender);
 
-			// reset repository state to prevent deadlock
+					// reset repository state to prevent deadlock
-			repository.discardChanges();
+					threadsRepository.discardChanges();
-			ValidationResult result = messageTransaction.importAsUnconfirmed();
+					ValidationResult result = messageTransaction.importAsUnconfirmed();
 
-			if (result != ValidationResult.OK) {
+					if (result != ValidationResult.OK) {
-				LOGGER.warn(() -> String.format("Unable to send MESSAGE to Bob's trade-bot %s: %s", messageRecipient, result.name()));
+						LOGGER.warn(() -> String.format("Unable to send MESSAGE to Bob's trade-bot %s: %s", messageRecipient, result.name()));
-				return ResponseResult.NETWORK_ISSUE;
+					}
-			}
+				} catch (DataException e) {
+					LOGGER.warn(() -> String.format("Unable to send MESSAGE to Bob's trade-bot %s: %s", messageRecipient, e.getMessage()));
+				}
+			}, "TradeBot response").start();
 		}
 
 		TradeBot.updateTradeBotState(repository, tradeBotData, () -> String.format("Funding P2SH-A %s. Messaged Bob. Waiting for AT-lock", p2shAddress));

src/main/java/org/qortal/controller/tradebot/PirateChainACCTv3TradeBot.java

@@ -1,9 +1,10 @@
 package org.qortal.controller.tradebot;
 
+import com.google.common.hash.HashCode;
+import com.rust.litewalletjni.LiteWalletJni;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.bitcoinj.core.*;
-import org.bitcoinj.script.Script.ScriptType;
 import org.qortal.account.PrivateKeyAccount;
 import org.qortal.account.PublicKeyAccount;
 import org.qortal.api.model.crosschain.TradeBotCreateRequest;
@@ -45,9 +46,9 @@ import static java.util.stream.Collectors.toMap;
  * 	<li>Trade-bot entries</li>
  * </ul>
  */
-public class DogecoinACCTv2TradeBot implements AcctTradeBot {
+public class PirateChainACCTv3TradeBot implements AcctTradeBot {
 
-	private static final Logger LOGGER = LogManager.getLogger(DogecoinACCTv2TradeBot.class);
+	private static final Logger LOGGER = LogManager.getLogger(PirateChainACCTv3TradeBot.class);
 
 	public enum State implements TradeBot.StateNameAndValueSupplier {
 		BOB_WAITING_FOR_AT_CONFIRM(10, false, false),
@@ -91,18 +92,18 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 	/** Maximum time Bob waits for his AT creation transaction to be confirmed into a block. (milliseconds) */
 	private static final long MAX_AT_CONFIRMATION_PERIOD = 24 * 60 * 60 * 1000L; // ms
 
-	private static DogecoinACCTv2TradeBot instance;
+	private static PirateChainACCTv3TradeBot instance;
 
 	private final List<String> endStates = Arrays.asList(State.BOB_DONE, State.BOB_REFUNDED, State.ALICE_DONE, State.ALICE_REFUNDING_A, State.ALICE_REFUNDED).stream()
 			.map(State::name)
 			.collect(Collectors.toUnmodifiableList());
 
-	private DogecoinACCTv2TradeBot() {
+	private PirateChainACCTv3TradeBot() {
 	}
 
-	public static synchronized DogecoinACCTv2TradeBot getInstance() {
+	public static synchronized PirateChainACCTv3TradeBot getInstance() {
 		if (instance == null)
-			instance = new DogecoinACCTv2TradeBot();
+			instance = new PirateChainACCTv3TradeBot();
 
 		return instance;
 	}
@@ -113,7 +114,7 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 	}
 
 	/**
-	 * Creates a new trade-bot entry from the "Bob" viewpoint, i.e. OFFERing QORT in exchange for DOGE.
+	 * Creates a new trade-bot entry from the "Bob" viewpoint, i.e. OFFERing QORT in exchange for ARRR.
 	 * <p>
 	 * Generates:
 	 * <ul>
@@ -122,14 +123,14 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 	 * Derives:
 	 * <ul>
 	 * 	<li>'native' (as in Qortal) public key, public key hash, address (starting with Q)</li>
-	 * 	<li>'foreign' (as in Dogecoin) public key, public key hash</li>
+	 * 	<li>'foreign' (as in PirateChain) public key, public key hash</li>
 	 * </ul>
 	 * A Qortal AT is then constructed including the following as constants in the 'data segment':
 	 * <ul>
 	 * 	<li>'native'/Qortal 'trade' address - used as a MESSAGE contact</li>
-	 * 	<li>'foreign'/Dogecoin public key hash - used by Alice's P2SH scripts to allow redeem</li>
+	 * 	<li>'foreign'/PirateChain public key hash - used by Alice's P2SH scripts to allow redeem</li>
 	 * 	<li>QORT amount on offer by Bob</li>
-	 * 	<li>DOGE amount expected in return by Bob (from Alice)</li>
+	 * 	<li>ARRR amount expected in return by Bob (from Alice)</li>
 	 * 	<li>trading timeout, in case things go wrong and everyone needs to refund</li>
 	 * </ul>
 	 * Returns a DEPLOY_AT transaction that needs to be signed and broadcast to the Qortal network.
@@ -151,17 +152,18 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 		byte[] tradeForeignPublicKey = TradeBot.deriveTradeForeignPublicKey(tradePrivateKey);
 		byte[] tradeForeignPublicKeyHash = Crypto.hash160(tradeForeignPublicKey);
 
-		// Convert Dogecoin receiving address into public key hash (we only support P2PKH at this time)
+		// ARRR wallet must be loaded before a trade can be created
-		Address dogecoinReceivingAddress;
+		// This is to stop trades from nodes on unsupported architectures (e.g. 32bit)
-		try {
+		if (!LiteWalletJni.isLoaded()) {
-			dogecoinReceivingAddress = Address.fromString(Dogecoin.getInstance().getNetworkParameters(), tradeBotCreateRequest.receivingAddress);
+			throw new DataException("Pirate wallet not found. Check wallets screen for details.");
-		} catch (AddressFormatException e) {
-			throw new DataException("Unsupported Dogecoin receiving address: " + tradeBotCreateRequest.receivingAddress);
 		}
-		if (dogecoinReceivingAddress.getOutputScriptType() != ScriptType.P2PKH)
-			throw new DataException("Unsupported Dogecoin receiving address: " + tradeBotCreateRequest.receivingAddress);
 
-		byte[] dogecoinReceivingAccountInfo = dogecoinReceivingAddress.getHash();
+		if (!PirateChain.getInstance().isValidAddress(tradeBotCreateRequest.receivingAddress)) {
+			throw new DataException("Unsupported Pirate Chain receiving address: " + tradeBotCreateRequest.receivingAddress);
+		}
+
+		Bech32.Bech32Data decodedReceivingAddress = Bech32.decode(tradeBotCreateRequest.receivingAddress);
+		byte[] pirateChainReceivingAccountInfo = decodedReceivingAddress.data;
 
 		PublicKeyAccount creator = new PublicKeyAccount(repository, tradeBotCreateRequest.creatorPublicKey);
 
@@ -172,11 +174,11 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 		byte[] signature = null;
 		BaseTransactionData baseTransactionData = new BaseTransactionData(timestamp, Group.NO_GROUP, reference, creator.getPublicKey(), fee, signature);
 
-		String name = "QORT/DOGE ACCT";
+		String name = "QORT/ARRR ACCT";
-		String description = "QORT/DOGE cross-chain trade";
+		String description = "QORT/ARRR cross-chain trade";
 		String aTType = "ACCT";
-		String tags = "ACCT QORT DOGE";
+		String tags = "ACCT QORT ARRR";
-		byte[] creationBytes = DogecoinACCTv2.buildQortalAT(tradeNativeAddress, tradeForeignPublicKeyHash, tradeBotCreateRequest.qortAmount,
+		byte[] creationBytes = PirateChainACCTv3.buildQortalAT(tradeNativeAddress, tradeForeignPublicKey, tradeBotCreateRequest.qortAmount,
 				tradeBotCreateRequest.foreignAmount, tradeBotCreateRequest.tradeTimeout);
 		long amount = tradeBotCreateRequest.fundingQortAmount;
 
@@ -189,14 +191,14 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 		DeployAtTransaction.ensureATAddress(deployAtTransactionData);
 		String atAddress = deployAtTransactionData.getAtAddress();
 
-		TradeBotData tradeBotData =  new TradeBotData(tradePrivateKey, DogecoinACCTv2.NAME,
+		TradeBotData tradeBotData =  new TradeBotData(tradePrivateKey, PirateChainACCTv3.NAME,
 				State.BOB_WAITING_FOR_AT_CONFIRM.name(), State.BOB_WAITING_FOR_AT_CONFIRM.value,
 				creator.getAddress(), atAddress, timestamp, tradeBotCreateRequest.qortAmount,
 				tradeNativePublicKey, tradeNativePublicKeyHash, tradeNativeAddress,
 				null, null,
-				SupportedBlockchain.DOGECOIN.name(),
+				SupportedBlockchain.PIRATECHAIN.name(),
 				tradeForeignPublicKey, tradeForeignPublicKeyHash,
-				tradeBotCreateRequest.foreignAmount, null, null, null, dogecoinReceivingAccountInfo);
+				tradeBotCreateRequest.foreignAmount, null, null, null, pirateChainReceivingAccountInfo);
 
 		TradeBot.updateTradeBotState(repository, tradeBotData, () -> String.format("Built AT %s. Waiting for deployment", atAddress));
 
@@ -212,15 +214,15 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 	}
 
 	/**
-	 * Creates a trade-bot entry from the 'Alice' viewpoint, i.e. matching DOGE to an existing offer.
+	 * Creates a trade-bot entry from the 'Alice' viewpoint, i.e. matching ARRR to an existing offer.
 	 * <p>
 	 * Requires a chosen trade offer from Bob, passed by <tt>crossChainTradeData</tt>
-	 * and access to a Dogecoin wallet via <tt>xprv58</tt>.
+	 * and access to a PirateChain wallet via <tt>xprv58</tt>.
 	 * <p>
 	 * The <tt>crossChainTradeData</tt> contains the current trade offer state
 	 * as extracted from the AT's data segment.
 	 * <p>
-	 * Access to a funded wallet is via a Dogecoin BIP32 hierarchical deterministic key,
+	 * Access to a funded wallet is via a PirateChain BIP32 hierarchical deterministic key,
 	 * passed via <tt>xprv58</tt>.
 	 * <b>This key will be stored in your node's database</b>
 	 * to allow trade-bot to create/fund the necessary P2SH transactions!
@@ -230,26 +232,26 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 	 * As an example, the xprv58 can be extract from a <i>legacy, password-less</i>
 	 * Electrum wallet by going to the console tab and entering:<br>
 	 * <tt>wallet.keystore.xprv</tt><br>
-	 * which should result in a base58 string starting with either 'xprv' (for Dogecoin main-net)
+	 * which should result in a base58 string starting with either 'xprv' (for PirateChain main-net)
-	 * or 'tprv' for (Dogecoin test-net).
+	 * or 'tprv' for (PirateChain test-net).
 	 * <p>
 	 * It is envisaged that the value in <tt>xprv58</tt> will actually come from a Qortal-UI-managed wallet.
 	 * <p>
 	 * If sufficient funds are available, <b>this method will actually fund the P2SH-A</b>
-	 * with the Dogecoin amount expected by 'Bob'.
+	 * with the PirateChain amount expected by 'Bob'.
 	 * <p>
-	 * If the Dogecoin transaction is successfully broadcast to the network then
+	 * If the PirateChain transaction is successfully broadcast to the network then
 	 * we also send a MESSAGE to Bob's trade-bot to let them know.
 	 * <p>
 	 * The trade-bot entry is saved to the repository and the cross-chain trading process commences.
 	 * <p>
 	 * @param repository
 	 * @param crossChainTradeData chosen trade OFFER that Alice wants to match
-	 * @param xprv58 funded wallet xprv in base58
+	 * @param seed58 funded wallet xprv in base58
-	 * @return true if P2SH-A funding transaction successfully broadcast to Dogecoin network, false otherwise
+	 * @return true if P2SH-A funding transaction successfully broadcast to PirateChain network, false otherwise
 	 * @throws DataException
 	 */
-	public ResponseResult startResponse(Repository repository, ATData atData, ACCT acct, CrossChainTradeData crossChainTradeData, String xprv58, String receivingAddress) throws DataException {
+	public ResponseResult startResponse(Repository repository, ATData atData, ACCT acct, CrossChainTradeData crossChainTradeData, String seed58, String receivingAddress) throws DataException {
 		byte[] tradePrivateKey = TradeBot.generateTradePrivateKey();
 		byte[] secretA = TradeBot.generateSecret();
 		byte[] hashOfSecretA = Crypto.hash160(secretA);
@@ -262,18 +264,22 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 		byte[] tradeForeignPublicKeyHash = Crypto.hash160(tradeForeignPublicKey);
 		byte[] receivingPublicKeyHash = Base58.decode(receivingAddress); // Actually the whole address, not just PKH
 
+		String tradePrivateKey58 = Base58.encode(tradePrivateKey);
+        String tradeForeignPublicKey58 = Base58.encode(tradeForeignPublicKey);
+		String secret58 = Base58.encode(secretA);
+
 		// We need to generate lockTime-A: add tradeTimeout to now
 		long now = NTP.getTime();
 		int lockTimeA = crossChainTradeData.tradeTimeout * 60 + (int) (now / 1000L);
 
-		TradeBotData tradeBotData =  new TradeBotData(tradePrivateKey, DogecoinACCTv2.NAME,
+		TradeBotData tradeBotData =  new TradeBotData(tradePrivateKey, PirateChainACCTv3.NAME,
 				State.ALICE_WAITING_FOR_AT_LOCK.name(), State.ALICE_WAITING_FOR_AT_LOCK.value,
 				receivingAddress, crossChainTradeData.qortalAtAddress, now, crossChainTradeData.qortAmount,
 				tradeNativePublicKey, tradeNativePublicKeyHash, tradeNativeAddress,
 				secretA, hashOfSecretA,
-				SupportedBlockchain.DOGECOIN.name(),
+				SupportedBlockchain.PIRATECHAIN.name(),
 				tradeForeignPublicKey, tradeForeignPublicKeyHash,
-				crossChainTradeData.expectedForeignAmount, xprv58, null, lockTimeA, receivingPublicKeyHash);
+				crossChainTradeData.expectedForeignAmount, seed58, null, lockTimeA, receivingPublicKeyHash);
 
 		// Attempt to backup the trade bot data
 		// Include tradeBotData as an additional parameter, since it's not in the repository yet
@@ -282,9 +288,9 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 		// Check we have enough funds via xprv58 to fund P2SH to cover expectedForeignAmount
 		long p2shFee;
 		try {
-			p2shFee = Dogecoin.getInstance().getP2shFee(now);
+			p2shFee = PirateChain.getInstance().getP2shFee(now);
 		} catch (ForeignBlockchainException e) {
-			LOGGER.debug("Couldn't estimate Dogecoin fees?");
+			LOGGER.debug("Couldn't estimate PirateChain fees?");
 			return ResponseResult.NETWORK_ISSUE;
 		}
 
@@ -293,26 +299,23 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 		long amountA = crossChainTradeData.expectedForeignAmount + p2shFee /*redeeming/refunding P2SH-A*/;
 
 		// P2SH-A to be funded
-		byte[] redeemScriptBytes = BitcoinyHTLC.buildScript(tradeForeignPublicKeyHash, lockTimeA, crossChainTradeData.creatorForeignPKH, hashOfSecretA);
+		byte[] redeemScriptBytes = PirateChainHTLC.buildScript(tradeForeignPublicKey, lockTimeA, crossChainTradeData.creatorForeignPKH, hashOfSecretA);
-		String p2shAddress = Dogecoin.getInstance().deriveP2shAddress(redeemScriptBytes);
+		String p2shAddressT3 = PirateChain.getInstance().deriveP2shAddress(redeemScriptBytes); // Use t3 prefix when funding
+		byte[] redeemScriptWithPrefixBytes = PirateChainHTLC.buildScriptWithPrefix(tradeForeignPublicKey, lockTimeA, crossChainTradeData.creatorForeignPKH, hashOfSecretA);
+		String redeemScriptWithPrefix58 = Base58.encode(redeemScriptWithPrefixBytes);
 
-		// Build transaction for funding P2SH-A
+		// Send to P2SH address
-		Transaction p2shFundingTransaction = Dogecoin.getInstance().buildSpend(tradeBotData.getForeignKey(), p2shAddress, amountA);
+		try {
-		if (p2shFundingTransaction == null) {
+			String txid = PirateChain.getInstance().fundP2SH(seed58, p2shAddressT3, amountA, redeemScriptWithPrefix58);
-			LOGGER.debug("Unable to build P2SH-A funding transaction - lack of funds?");
+			LOGGER.info("fundingTxidHex: {}", txid);
+
+		} catch (ForeignBlockchainException e) {
+			LOGGER.debug("Unable to build and send P2SH-A funding transaction - lack of funds?");
 			return ResponseResult.BALANCE_ISSUE;
 		}
 
-		try {
-			Dogecoin.getInstance().broadcastTransaction(p2shFundingTransaction);
-		} catch (ForeignBlockchainException e) {
-			// We couldn't fund P2SH-A at this time
-			LOGGER.debug("Couldn't broadcast P2SH-A funding transaction?");
-			return ResponseResult.NETWORK_ISSUE;
-		}
-
 		// Attempt to send MESSAGE to Bob's Qortal trade address
-		byte[] messageData = DogecoinACCTv2.buildOfferMessage(tradeBotData.getTradeForeignPublicKeyHash(), tradeBotData.getHashOfSecret(), tradeBotData.getLockTimeA());
+		byte[] messageData = PirateChainACCTv3.buildOfferMessage(tradeBotData.getTradeForeignPublicKey(), tradeBotData.getHashOfSecret(), tradeBotData.getLockTimeA());
 		String messageRecipient = crossChainTradeData.qortalCreatorTradeAddress;
 
 		boolean isMessageAlreadySent = repository.getMessageRepository().exists(tradeBotData.getTradeNativePublicKey(), messageRecipient, messageData);
@@ -333,11 +336,21 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 			}
 		}
 
-		TradeBot.updateTradeBotState(repository, tradeBotData, () -> String.format("Funding P2SH-A %s. Messaged Bob. Waiting for AT-lock", p2shAddress));
+		TradeBot.updateTradeBotState(repository, tradeBotData, () -> String.format("Funding P2SH-A %s. Messaged Bob. Waiting for AT-lock", p2shAddressT3));
 
 		return ResponseResult.OK;
 	}
 
+	public static String hex(byte[] bytes) {
+		StringBuilder result = new StringBuilder();
+		for (byte aByte : bytes) {
+			result.append(String.format("%02x", aByte));
+			// upper case
+			// result.append(String.format("%02X", aByte));
+		}
+		return result.toString();
+	}
+
 	@Override
 	public boolean canDelete(Repository repository, TradeBotData tradeBotData) throws DataException {
 		State tradeBotState = State.valueOf(tradeBotData.getStateValue());
@@ -354,6 +367,7 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 			case BOB_DONE:
 			case ALICE_REFUNDED:
 			case BOB_REFUNDED:
+			case ALICE_REFUNDING_A:
 				return true;
 
 			default:
@@ -381,7 +395,7 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 			}
 
 			if (tradeBotState.requiresTradeData) {
-				tradeData = DogecoinACCTv2.getInstance().populateTradeData(repository, atData);
+				tradeData = PirateChainACCTv3.getInstance().populateTradeData(repository, atData);
 				if (tradeData == null) {
 					LOGGER.warn(() -> String.format("Unable to fetch ACCT trade data for AT %s from repository", tradeBotData.getAtAddress()));
 					return;
@@ -462,7 +476,7 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 	 * <p>
 	 * Details from Alice are used to derive P2SH-A address and this is checked for funding balance.
 	 * <p>
-	 * Assuming P2SH-A has at least expected Dogecoin balance,
+	 * Assuming P2SH-A has at least expected PirateChain balance,
 	 * Bob's trade-bot constructs a zero-fee, PoW MESSAGE to send to Bob's AT with more trade details.
 	 * <p>
 	 * On processing this MESSAGE, Bob's AT should switch into 'TRADE' mode and only trade with Alice.
@@ -480,7 +494,7 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 			return;
 		}
 
-		Dogecoin dogecoin = Dogecoin.getInstance();
+		PirateChain pirateChain = PirateChain.getInstance();
 
 		String address = tradeBotData.getTradeNativeAddress();
 		List<MessageTransactionData> messageTransactionsData = repository.getMessageRepository().getMessagesByParticipants(null, address, null, null, null);
@@ -489,27 +503,27 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 			if (messageTransactionData.isText())
 				continue;
 
-			// We're expecting: HASH160(secret-A), Alice's Dogecoin pubkeyhash and lockTime-A
+			// We're expecting: HASH160(secret-A), Alice's PirateChain pubkeyhash and lockTime-A
 			byte[] messageData = messageTransactionData.getData();
-			DogecoinACCTv2.OfferMessageData offerMessageData = DogecoinACCTv2.extractOfferMessageData(messageData);
+			PirateChainACCTv3.OfferMessageData offerMessageData = PirateChainACCTv3.extractOfferMessageData(messageData);
 			if (offerMessageData == null)
 				continue;
 
-			byte[] aliceForeignPublicKeyHash = offerMessageData.partnerDogecoinPKH;
+			byte[] aliceForeignPublicKey = offerMessageData.partnerPirateChainPublicKey;
 			byte[] hashOfSecretA = offerMessageData.hashOfSecretA;
 			int lockTimeA = (int) offerMessageData.lockTimeA;
 			long messageTimestamp = messageTransactionData.getTimestamp();
-			int refundTimeout = DogecoinACCTv2.calcRefundTimeout(messageTimestamp, lockTimeA);
+			int refundTimeout = PirateChainACCTv3.calcRefundTimeout(messageTimestamp, lockTimeA);
 
 			// Determine P2SH-A address and confirm funded
-			byte[] redeemScriptA = BitcoinyHTLC.buildScript(aliceForeignPublicKeyHash, lockTimeA, tradeBotData.getTradeForeignPublicKeyHash(), hashOfSecretA);
+			byte[] redeemScriptA = PirateChainHTLC.buildScript(aliceForeignPublicKey, lockTimeA, tradeBotData.getTradeForeignPublicKey(), hashOfSecretA);
-			String p2shAddressA = dogecoin.deriveP2shAddress(redeemScriptA);
+			String p2shAddress = pirateChain.deriveP2shAddressBPrefix(redeemScriptA); // Use 'b' prefix when checking status
 
 			long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
-			long p2shFee = Dogecoin.getInstance().getP2shFee(feeTimestamp);
+			long p2shFee = PirateChain.getInstance().getP2shFee(feeTimestamp);
 			final long minimumAmountA = tradeBotData.getForeignAmount() + p2shFee;
 
-			BitcoinyHTLC.Status htlcStatusA = BitcoinyHTLC.determineHtlcStatus(dogecoin.getBlockchainProvider(), p2shAddressA, minimumAmountA);
+			BitcoinyHTLC.Status htlcStatusA = PirateChainHTLC.determineHtlcStatus(pirateChain.getBlockchainProvider(), p2shAddress, minimumAmountA);
 
 			switch (htlcStatusA) {
 				case UNFUNDED:
@@ -521,7 +535,7 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 				case REDEEMED:
 					// We've already redeemed this?
 					TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_DONE,
-							() -> String.format("P2SH-A %s already spent? Assuming trade complete", p2shAddressA));
+							() -> String.format("P2SH-A %s already spent? Assuming trade complete", p2shAddress));
 					return;
 
 				case REFUND_IN_PROGRESS:
@@ -539,7 +553,7 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 			String aliceNativeAddress = Crypto.toAddress(messageTransactionData.getCreatorPublicKey());
 
 			// Build outgoing message, padding each part to 32 bytes to make it easier for AT to consume
-			byte[] outgoingMessageData = DogecoinACCTv2.buildTradeMessage(aliceNativeAddress, aliceForeignPublicKeyHash, hashOfSecretA, lockTimeA, refundTimeout);
+			byte[] outgoingMessageData = PirateChainACCTv3.buildTradeMessage(aliceNativeAddress, aliceForeignPublicKey, hashOfSecretA, lockTimeA, refundTimeout);
 			String messageRecipient = tradeBotData.getAtAddress();
 
 			boolean isMessageAlreadySent = repository.getMessageRepository().exists(tradeBotData.getTradeNativePublicKey(), messageRecipient, outgoingMessageData);
@@ -578,7 +592,7 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 	 * <p>
 	 * If all is well, trade-bot then redeems AT using Alice's secret-A, releasing Bob's QORT to Alice.
 	 * <p>
-	 * In revealing a valid secret-A, Bob can then redeem the DOGE funds from P2SH-A.
+	 * In revealing a valid secret-A, Bob can then redeem the ARRR funds from P2SH-A.
 	 * <p>
 	 * @throws ForeignBlockchainException
 	 */
@@ -587,19 +601,19 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 		if (aliceUnexpectedState(repository, tradeBotData, atData, crossChainTradeData))
 			return;
 
-		Dogecoin dogecoin = Dogecoin.getInstance();
+		PirateChain pirateChain = PirateChain.getInstance();
 		int lockTimeA = tradeBotData.getLockTimeA();
 
 		// Refund P2SH-A if we've passed lockTime-A
 		if (NTP.getTime() >= lockTimeA * 1000L) {
-			byte[] redeemScriptA = BitcoinyHTLC.buildScript(tradeBotData.getTradeForeignPublicKeyHash(), lockTimeA, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
+			byte[] redeemScriptA = PirateChainHTLC.buildScript(tradeBotData.getTradeForeignPublicKey(), lockTimeA, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
-			String p2shAddressA = dogecoin.deriveP2shAddress(redeemScriptA);
+			String p2shAddress = pirateChain.deriveP2shAddressBPrefix(redeemScriptA); // Use 'b' prefix when checking status
 
 			long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
-			long p2shFee = Dogecoin.getInstance().getP2shFee(feeTimestamp);
+			long p2shFee = PirateChain.getInstance().getP2shFee(feeTimestamp);
 			long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
 
-			BitcoinyHTLC.Status htlcStatusA = BitcoinyHTLC.determineHtlcStatus(dogecoin.getBlockchainProvider(), p2shAddressA, minimumAmountA);
+			BitcoinyHTLC.Status htlcStatusA = PirateChainHTLC.determineHtlcStatus(pirateChain.getBlockchainProvider(), p2shAddress, minimumAmountA);
 
 			switch (htlcStatusA) {
 				case UNFUNDED:
@@ -611,21 +625,21 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 				case REDEEMED:
 					// Already redeemed?
 					TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_DONE,
-							() -> String.format("P2SH-A %s already spent? Assuming trade completed", p2shAddressA));
+							() -> String.format("P2SH-A %s already spent? Assuming trade completed", p2shAddress));
 					return;
 
 				case REFUND_IN_PROGRESS:
 				case REFUNDED:
 					TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDED,
-							() -> String.format("P2SH-A %s already refunded. Trade aborted", p2shAddressA));
+							() -> String.format("P2SH-A %s already refunded. Trade aborted", p2shAddress));
 					return;
 
 			}
 
 			TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDING_A,
 					() -> atData.getIsFinished()
-					? String.format("AT %s cancelled. Refunding P2SH-A %s - aborting trade", tradeBotData.getAtAddress(), p2shAddressA)
+					? String.format("AT %s cancelled. Refunding P2SH-A %s - aborting trade", tradeBotData.getAtAddress(), p2shAddress)
-					: String.format("LockTime-A reached, refunding P2SH-A %s - aborting trade", p2shAddressA));
+					: String.format("LockTime-A reached, refunding P2SH-A %s - aborting trade", p2shAddress));
 
 			return;
 		}
@@ -645,7 +659,7 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 		}
 
 		long recipientMessageTimestamp = messageTransactionsData.get(0).getTimestamp();
-		int refundTimeout = DogecoinACCTv2.calcRefundTimeout(recipientMessageTimestamp, lockTimeA);
+		int refundTimeout = PirateChainACCTv3.calcRefundTimeout(recipientMessageTimestamp, lockTimeA);
 
 		// Our calculated refundTimeout should match AT's refundTimeout
 		if (refundTimeout != crossChainTradeData.refundTimeout) {
@@ -659,7 +673,7 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 		// Send 'redeem' MESSAGE to AT using both secret
 		byte[] secretA = tradeBotData.getSecret();
 		String qortalReceivingAddress = Base58.encode(tradeBotData.getReceivingAccountInfo()); // Actually contains whole address, not just PKH
-		byte[] messageData = DogecoinACCTv2.buildRedeemMessage(secretA, qortalReceivingAddress);
+		byte[] messageData = PirateChainACCTv3.buildRedeemMessage(secretA, qortalReceivingAddress);
 		String messageRecipient = tradeBotData.getAtAddress();
 
 		boolean isMessageAlreadySent = repository.getMessageRepository().exists(tradeBotData.getTradeNativePublicKey(), messageRecipient, messageData);
@@ -686,15 +700,15 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 	}
 
 	/**
-	 * Trade-bot is waiting for Alice to redeem Bob's AT, thus revealing secret-A which is required to spend the DOGE funds from P2SH-A.
+	 * Trade-bot is waiting for Alice to redeem Bob's AT, thus revealing secret-A which is required to spend the ARRR funds from P2SH-A.
 	 * <p>
 	 * It's possible that Bob's AT has reached its trading timeout and automatically refunded QORT back to Bob. In which case,
 	 * trade-bot is done with this specific trade and finalizes in refunded state.
 	 * <p>
-	 * Assuming trade-bot can extract a valid secret-A from Alice's MESSAGE then trade-bot uses that to redeem the DOGE funds from P2SH-A
+	 * Assuming trade-bot can extract a valid secret-A from Alice's MESSAGE then trade-bot uses that to redeem the ARRR funds from P2SH-A
-	 * to Bob's 'foreign'/Dogecoin trade legacy-format address, as derived from trade private key.
+	 * to Bob's 'foreign'/PirateChain trade legacy-format address, as derived from trade private key.
 	 * <p>
-	 * (This could potentially be 'improved' to send DOGE to any address of Bob's choosing by changing the transaction output).
+	 * (This could potentially be 'improved' to send ARRR to any address of Bob's choosing by changing the transaction output).
 	 * <p>
 	 * If trade-bot successfully broadcasts the transaction, then this specific trade is done.
 	 * @throws ForeignBlockchainException
@@ -708,14 +722,14 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 
 		// If AT is REFUNDED or CANCELLED then something has gone wrong
 		if (crossChainTradeData.mode == AcctMode.REFUNDED || crossChainTradeData.mode == AcctMode.CANCELLED) {
-			// Alice hasn't redeemed the QORT, so there is no point in trying to redeem the DOGE
+			// Alice hasn't redeemed the QORT, so there is no point in trying to redeem the ARRR
 			TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_REFUNDED,
 					() -> String.format("AT %s has auto-refunded - trade aborted", tradeBotData.getAtAddress()));
 
 			return;
 		}
 
-		byte[] secretA = DogecoinACCTv2.getInstance().findSecretA(repository, crossChainTradeData);
+		byte[] secretA = PirateChainACCTv3.getInstance().findSecretA(repository, crossChainTradeData);
 		if (secretA == null) {
 			LOGGER.debug(() -> String.format("Unable to find secret-A from redeem message to AT %s?", tradeBotData.getAtAddress()));
 			return;
@@ -723,18 +737,21 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 
 		// Use secret-A to redeem P2SH-A
 
-		Dogecoin dogecoin = Dogecoin.getInstance();
+		PirateChain pirateChain = PirateChain.getInstance();
 
 		byte[] receivingAccountInfo = tradeBotData.getReceivingAccountInfo();
 		int lockTimeA = crossChainTradeData.lockTimeA;
-		byte[] redeemScriptA = BitcoinyHTLC.buildScript(crossChainTradeData.partnerForeignPKH, lockTimeA, crossChainTradeData.creatorForeignPKH, crossChainTradeData.hashOfSecretA);
+		byte[] redeemScriptA = PirateChainHTLC.buildScript(crossChainTradeData.partnerForeignPKH, lockTimeA, crossChainTradeData.creatorForeignPKH, crossChainTradeData.hashOfSecretA);
-		String p2shAddressA = dogecoin.deriveP2shAddress(redeemScriptA);
+		String p2shAddress = pirateChain.deriveP2shAddressBPrefix(redeemScriptA); // Use 'b' prefix when checking status
+		String p2shAddressT3 = pirateChain.deriveP2shAddress(redeemScriptA); // Use 't3' prefix when refunding
 
 		// Fee for redeem/refund is subtracted from P2SH-A balance.
 		long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
-		long p2shFee = Dogecoin.getInstance().getP2shFee(feeTimestamp);
+		long p2shFee = PirateChain.getInstance().getP2shFee(feeTimestamp);
 		long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
-		BitcoinyHTLC.Status htlcStatusA = BitcoinyHTLC.determineHtlcStatus(dogecoin.getBlockchainProvider(), p2shAddressA, minimumAmountA);
+		String receivingAddress = Bech32.encode("zs", receivingAccountInfo);
+
+		BitcoinyHTLC.Status htlcStatusA = PirateChainHTLC.determineHtlcStatus(pirateChain.getBlockchainProvider(), p2shAddress, minimumAmountA);
 
 		switch (htlcStatusA) {
 			case UNFUNDED:
@@ -753,20 +770,27 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 				return;
 
 			case FUNDED: {
+				// Get funding txid
+				String fundingTxidHex = PirateChainHTLC.getUnspentFundingTxid(pirateChain.getBlockchainProvider(), p2shAddress, minimumAmountA);
+				if (fundingTxidHex == null) {
+					throw new ForeignBlockchainException("Missing funding txid when redeeming P2SH");
+				}
+				String fundingTxid58 = Base58.encode(HashCode.fromString(fundingTxidHex).asBytes());
+
+				// Redeem P2SH
 				Coin redeemAmount = Coin.valueOf(crossChainTradeData.expectedForeignAmount);
-				ECKey redeemKey = ECKey.fromPrivate(tradeBotData.getTradePrivateKey());
+				byte[] privateKey = tradeBotData.getTradePrivateKey();
-				List<TransactionOutput> fundingOutputs = dogecoin.getUnspentOutputs(p2shAddressA);
+				String secret58 = Base58.encode(secretA);
+				String privateKey58 = Base58.encode(privateKey);
+				String redeemScript58 = Base58.encode(redeemScriptA);
 
-				Transaction p2shRedeemTransaction = BitcoinyHTLC.buildRedeemTransaction(dogecoin.getNetworkParameters(), redeemAmount, redeemKey,
+				String txid = PirateChain.getInstance().redeemP2sh(p2shAddressT3, receivingAddress, redeemAmount.value,
-						fundingOutputs, redeemScriptA, secretA, receivingAccountInfo);
+						redeemScript58, fundingTxid58, secret58, privateKey58);
-
+				LOGGER.info("Redeem txid: {}", txid);
-				dogecoin.broadcastTransaction(p2shRedeemTransaction);
 				break;
 			}
 		}
 
-		String receivingAddress = dogecoin.pkhToAddress(receivingAccountInfo);
-
 		TradeBot.updateTradeBotState(repository, tradeBotData, State.BOB_DONE,
 				() -> String.format("P2SH-A %s redeemed. Funds should arrive at %s", tradeBotData.getAtAddress(), receivingAddress));
 	}
@@ -783,21 +807,22 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 		if (NTP.getTime() <= lockTimeA * 1000L)
 			return;
 
-		Dogecoin dogecoin = Dogecoin.getInstance();
+		PirateChain pirateChain = PirateChain.getInstance();
 
 		// We can't refund P2SH-A until median block time has passed lockTime-A (see BIP113)
-		int medianBlockTime = dogecoin.getMedianBlockTime();
+		int medianBlockTime = pirateChain.getMedianBlockTime();
 		if (medianBlockTime <= lockTimeA)
 			return;
 
-		byte[] redeemScriptA = BitcoinyHTLC.buildScript(tradeBotData.getTradeForeignPublicKeyHash(), lockTimeA, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
+		byte[] redeemScriptA = PirateChainHTLC.buildScript(tradeBotData.getTradeForeignPublicKey(), lockTimeA, crossChainTradeData.creatorForeignPKH, tradeBotData.getHashOfSecret());
-		String p2shAddressA = dogecoin.deriveP2shAddress(redeemScriptA);
+		String p2shAddress = pirateChain.deriveP2shAddressBPrefix(redeemScriptA); // Use 'b' prefix when checking status
+		String p2shAddressT3 = pirateChain.deriveP2shAddress(redeemScriptA); // Use 't3' prefix when refunding
 
 		// Fee for redeem/refund is subtracted from P2SH-A balance.
 		long feeTimestamp = calcFeeTimestamp(lockTimeA, crossChainTradeData.tradeTimeout);
-		long p2shFee = Dogecoin.getInstance().getP2shFee(feeTimestamp);
+		long p2shFee = PirateChain.getInstance().getP2shFee(feeTimestamp);
 		long minimumAmountA = crossChainTradeData.expectedForeignAmount + p2shFee;
-		BitcoinyHTLC.Status htlcStatusA = BitcoinyHTLC.determineHtlcStatus(dogecoin.getBlockchainProvider(), p2shAddressA, minimumAmountA);
+		BitcoinyHTLC.Status htlcStatusA = PirateChainHTLC.determineHtlcStatus(pirateChain.getBlockchainProvider(), p2shAddress, minimumAmountA);
 
 		switch (htlcStatusA) {
 			case UNFUNDED:
@@ -809,7 +834,7 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 			case REDEEMED:
 				// Too late!
 				TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_DONE,
-						() -> String.format("P2SH-A %s already spent!", p2shAddressA));
+						() -> String.format("P2SH-A %s already spent!", p2shAddress));
 				return;
 
 			case REFUND_IN_PROGRESS:
@@ -817,24 +842,28 @@ public class DogecoinACCTv2TradeBot implements AcctTradeBot {
 				break;
 
 			case FUNDED:{
+				// Get funding txid
+				String fundingTxidHex = PirateChainHTLC.getUnspentFundingTxid(pirateChain.getBlockchainProvider(), p2shAddress, minimumAmountA);
+				if (fundingTxidHex == null) {
+					throw new ForeignBlockchainException("Missing funding txid when refunding P2SH");
+				}
+				String fundingTxid58 = Base58.encode(HashCode.fromString(fundingTxidHex).asBytes());
+
 				Coin refundAmount = Coin.valueOf(crossChainTradeData.expectedForeignAmount);
-				ECKey refundKey = ECKey.fromPrivate(tradeBotData.getTradePrivateKey());
+				byte[] privateKey = tradeBotData.getTradePrivateKey();
-				List<TransactionOutput> fundingOutputs = dogecoin.getUnspentOutputs(p2shAddressA);
+				String privateKey58 = Base58.encode(privateKey);
+				String redeemScript58 = Base58.encode(redeemScriptA);
+				String receivingAddress = pirateChain.getWalletAddress(tradeBotData.getForeignKey());
 
-				// Determine receive address for refund
+				String txid = PirateChain.getInstance().refundP2sh(p2shAddressT3,
-				String receiveAddress = dogecoin.getUnusedReceiveAddress(tradeBotData.getForeignKey());
+						receivingAddress, refundAmount.value, redeemScript58, fundingTxid58, lockTimeA, privateKey58);
-				Address receiving = Address.fromString(dogecoin.getNetworkParameters(), receiveAddress);
+				LOGGER.info("Refund txid: {}", txid);
-
-				Transaction p2shRefundTransaction = BitcoinyHTLC.buildRefundTransaction(dogecoin.getNetworkParameters(), refundAmount, refundKey,
-						fundingOutputs, redeemScriptA, lockTimeA, receiving.getHash());
-
-				dogecoin.broadcastTransaction(p2shRefundTransaction);
 				break;
 			}
 		}
 
 		TradeBot.updateTradeBotState(repository, tradeBotData, State.ALICE_REFUNDED,
-				() -> String.format("LockTime-A reached. Refunded P2SH-A %s. Trade aborted", p2shAddressA));
+				() -> String.format("LockTime-A reached. Refunded P2SH-A %s. Trade aborted", p2shAddress));
 	}
 
 	/**

src/main/java/org/qortal/controller/tradebot/TradeBot.java

@@ -96,13 +96,12 @@ public class TradeBot implements Listener {
 		acctTradeBotSuppliers.put(BitcoinACCTv1.class, BitcoinACCTv1TradeBot::getInstance);
 		acctTradeBotSuppliers.put(BitcoinACCTv3.class, BitcoinACCTv3TradeBot::getInstance);
 		acctTradeBotSuppliers.put(LitecoinACCTv1.class, LitecoinACCTv1TradeBot::getInstance);
-		acctTradeBotSuppliers.put(LitecoinACCTv2.class, LitecoinACCTv2TradeBot::getInstance);
 		acctTradeBotSuppliers.put(LitecoinACCTv3.class, LitecoinACCTv3TradeBot::getInstance);
 		acctTradeBotSuppliers.put(DogecoinACCTv1.class, DogecoinACCTv1TradeBot::getInstance);
-		acctTradeBotSuppliers.put(DogecoinACCTv2.class, DogecoinACCTv2TradeBot::getInstance);
 		acctTradeBotSuppliers.put(DogecoinACCTv3.class, DogecoinACCTv3TradeBot::getInstance);
 		acctTradeBotSuppliers.put(DigibyteACCTv3.class, DigibyteACCTv3TradeBot::getInstance);
 		acctTradeBotSuppliers.put(RavencoinACCTv3.class, RavencoinACCTv3TradeBot::getInstance);
+		acctTradeBotSuppliers.put(PirateChainACCTv3.class, PirateChainACCTv3TradeBot::getInstance);
 	}
 
 	private static TradeBot instance;
@@ -292,14 +291,14 @@ public class TradeBot implements Listener {
 	}
 
 	public static byte[] deriveTradeNativePublicKey(byte[] privateKey) {
-		return PrivateKeyAccount.toPublicKey(privateKey);
+		return Crypto.toPublicKey(privateKey);
 	}
 
 	public static byte[] deriveTradeForeignPublicKey(byte[] privateKey) {
 		return ECKey.fromPrivate(privateKey).getPubKey();
 	}
 
-	/*package*/ static byte[] generateSecret() {
+	/*package*/ public static byte[] generateSecret() {
 		byte[] secret = new byte[32];
 		RANDOM.nextBytes(secret);
 		return secret;
@@ -469,9 +468,6 @@ public class TradeBot implements Listener {
 
 		List<TradePresenceData> safeTradePresences = List.copyOf(this.safeAllTradePresencesByPubkey.values());
 
-		if (safeTradePresences.isEmpty())
-			return;
-
 		LOGGER.debug("Broadcasting all {} known trade presences. Next broadcast timestamp: {}",
 				safeTradePresences.size(), nextTradePresenceBroadcastTimestamp
 		);
@@ -638,7 +634,7 @@ public class TradeBot implements Listener {
 		}
 
 		if (newCount > 0) {
-			LOGGER.debug("New trade presences: {}", newCount);
+			LOGGER.debug("New trade presences: {}, all trade presences: {}", newCount, allTradePresencesByPubkey.size());
 			rebuildSafeAllTradePresences();
 		}
 	}

src/main/java/org/qortal/crosschain/Bitcoin.java

@@ -174,6 +174,8 @@ public class Bitcoin extends Bitcoiny {
 			Context bitcoinjContext = new Context(bitcoinNet.getParams());
 
 			instance = new Bitcoin(bitcoinNet, electrumX, bitcoinjContext, CURRENCY_CODE);
+
+			electrumX.setBlockchain(instance);
 		}
 
 		return instance;

src/main/java/org/qortal/crosschain/Bitcoiny.java

@@ -29,6 +29,7 @@ import org.bitcoinj.wallet.SendRequest;
 import org.bitcoinj.wallet.Wallet;
 import org.qortal.api.model.SimpleForeignTransaction;
 import org.qortal.crypto.Crypto;
+import org.qortal.settings.Settings;
 import org.qortal.utils.Amounts;
 import org.qortal.utils.BitTwiddling;
 
@@ -42,7 +43,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 
 	public static final int HASH160_LENGTH = 20;
 
-	protected final BitcoinyBlockchainProvider blockchain;
+	protected final BitcoinyBlockchainProvider blockchainProvider;
 	protected final Context bitcoinjContext;
 	protected final String currencyCode;
 
@@ -61,18 +62,13 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	/** How many wallet keys to generate in each batch. */
 	private static final int WALLET_KEY_LOOKAHEAD_INCREMENT = 3;
 
-	/** How many wallet keys to generate when using bitcoinj as the data provider.
-	 * We must use a higher value here since we are unable to request multiple batches of keys.
-	 * Without this, the bitcoinj state can be missing transactions, causing errors such as "insufficient balance". */
-	private static final int WALLET_KEY_LOOKAHEAD_INCREMENT_BITCOINJ = 50;
-
 	/** Byte offset into raw block headers to block timestamp. */
 	private static final int TIMESTAMP_OFFSET = 4 + 32 + 32;
 
 	// Constructors and instance
 
-	protected Bitcoiny(BitcoinyBlockchainProvider blockchain, Context bitcoinjContext, String currencyCode) {
+	protected Bitcoiny(BitcoinyBlockchainProvider blockchainProvider, Context bitcoinjContext, String currencyCode) {
-		this.blockchain = blockchain;
+		this.blockchainProvider = blockchainProvider;
 		this.bitcoinjContext = bitcoinjContext;
 		this.currencyCode = currencyCode;
 
@@ -82,7 +78,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	// Getters & setters
 
 	public BitcoinyBlockchainProvider getBlockchainProvider() {
-		return this.blockchain;
+		return this.blockchainProvider;
 	}
 
 	public Context getBitcoinjContext() {
@@ -155,10 +151,10 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	 * @throws ForeignBlockchainException if error occurs
 	 */
 	public int getMedianBlockTime() throws ForeignBlockchainException {
-		int height = this.blockchain.getCurrentHeight();
+		int height = this.blockchainProvider.getCurrentHeight();
 
 		// Grab latest 11 blocks
-		List<byte[]> blockHeaders = this.blockchain.getRawBlockHeaders(height - 11, 11);
+		List<byte[]> blockHeaders = this.blockchainProvider.getRawBlockHeaders(height - 11, 11);
 		if (blockHeaders.size() < 11)
 			throw new ForeignBlockchainException("Not enough blocks to determine median block time");
 
@@ -197,7 +193,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	 * @throws ForeignBlockchainException if there was an error
 	 */
 	public long getConfirmedBalance(String base58Address) throws ForeignBlockchainException {
-		return this.blockchain.getConfirmedBalance(addressToScriptPubKey(base58Address));
+		return this.blockchainProvider.getConfirmedBalance(addressToScriptPubKey(base58Address));
 	}
 
 	/**
@@ -208,7 +204,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	 */
 	// TODO: don't return bitcoinj-based objects like TransactionOutput, use BitcoinyTransaction.Output instead
 	public List<TransactionOutput> getUnspentOutputs(String base58Address) throws ForeignBlockchainException {
-		List<UnspentOutput> unspentOutputs = this.blockchain.getUnspentOutputs(addressToScriptPubKey(base58Address), false);
+		List<UnspentOutput> unspentOutputs = this.blockchainProvider.getUnspentOutputs(addressToScriptPubKey(base58Address), false);
 
 		List<TransactionOutput> unspentTransactionOutputs = new ArrayList<>();
 		for (UnspentOutput unspentOutput : unspentOutputs) {
@@ -228,7 +224,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	 */
 	// TODO: don't return bitcoinj-based objects like TransactionOutput, use BitcoinyTransaction.Output instead
 	public List<TransactionOutput> getOutputs(byte[] txHash) throws ForeignBlockchainException {
-		byte[] rawTransactionBytes = this.blockchain.getRawTransaction(txHash);
+		byte[] rawTransactionBytes = this.blockchainProvider.getRawTransaction(txHash);
 
 		Context.propagate(bitcoinjContext);
 		Transaction transaction = new Transaction(this.params, rawTransactionBytes);
@@ -245,7 +241,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 		ForeignBlockchainException e2 = null;
 		while (retries <= 3) {
 			try {
-				return this.blockchain.getAddressTransactions(scriptPubKey, includeUnconfirmed);
+				return this.blockchainProvider.getAddressTransactions(scriptPubKey, includeUnconfirmed);
 			} catch (ForeignBlockchainException e) {
 				e2 = e;
 				retries++;
@@ -261,7 +257,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	 * @throws ForeignBlockchainException if there was an error.
 	 */
 	public List<TransactionHash> getAddressTransactions(String base58Address, boolean includeUnconfirmed) throws ForeignBlockchainException {
-		return this.blockchain.getAddressTransactions(addressToScriptPubKey(base58Address), includeUnconfirmed);
+		return this.blockchainProvider.getAddressTransactions(addressToScriptPubKey(base58Address), includeUnconfirmed);
 	}
 
 	/**
@@ -270,11 +266,11 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	 * @throws ForeignBlockchainException if there was an error
 	 */
 	public List<byte[]> getAddressTransactions(String base58Address) throws ForeignBlockchainException {
-		List<TransactionHash> transactionHashes = this.blockchain.getAddressTransactions(addressToScriptPubKey(base58Address), false);
+		List<TransactionHash> transactionHashes = this.blockchainProvider.getAddressTransactions(addressToScriptPubKey(base58Address), false);
 
 		List<byte[]> rawTransactions = new ArrayList<>();
 		for (TransactionHash transactionInfo : transactionHashes) {
-			byte[] rawTransaction = this.blockchain.getRawTransaction(HashCode.fromString(transactionInfo.txHash).asBytes());
+			byte[] rawTransaction = this.blockchainProvider.getRawTransaction(HashCode.fromString(transactionInfo.txHash).asBytes());
 			rawTransactions.add(rawTransaction);
 		}
 
@@ -292,7 +288,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 		ForeignBlockchainException e2 = null;
 		while (retries <= 3) {
 			try {
-				return this.blockchain.getTransaction(txHash);
+				return this.blockchainProvider.getTransaction(txHash);
 			} catch (ForeignBlockchainException e) {
 				e2 = e;
 				retries++;
@@ -307,7 +303,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	 * @throws ForeignBlockchainException if error occurs
 	 */
 	public void broadcastTransaction(Transaction transaction) throws ForeignBlockchainException {
-		this.blockchain.broadcastTransaction(transaction.bitcoinSerialize());
+		this.blockchainProvider.broadcastTransaction(transaction.bitcoinSerialize());
 	}
 
 	/**
@@ -360,7 +356,24 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 	 * @param key58 BIP32/HD extended Bitcoin private/public key
 	 * @return unspent BTC balance, or null if unable to determine balance
 	 */
-	public Long getWalletBalance(String key58) {
+	public Long getWalletBalance(String key58) throws ForeignBlockchainException {
+		Long balance = 0L;
+
+		List<TransactionOutput> allUnspentOutputs = new ArrayList<>();
+		Set<String> walletAddresses = this.getWalletAddresses(key58);
+		for (String address : walletAddresses) {
+			allUnspentOutputs.addAll(this.getUnspentOutputs(address));
+		}
+		for (TransactionOutput output : allUnspentOutputs) {
+			if (!output.isAvailableForSpending()) {
+				continue;
+			}
+			balance += output.getValue().value;
+		}
+		return balance;
+	}
+
+	public Long getWalletBalanceFromBitcoinj(String key58) {
 		Context.propagate(bitcoinjContext);
 
 		Wallet wallet = walletFromDeterministicKey58(key58);
@@ -375,7 +388,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 
 	public Long getWalletBalanceFromTransactions(String key58) throws ForeignBlockchainException {
 		long balance = 0;
-		Comparator<SimpleTransaction> oldestTimestampFirstComparator = Comparator.comparingInt(SimpleTransaction::getTimestamp);
+		Comparator<SimpleTransaction> oldestTimestampFirstComparator = Comparator.comparingLong(SimpleTransaction::getTimestamp);
 		List<SimpleTransaction> transactions = getWalletTransactions(key58).stream().sorted(oldestTimestampFirstComparator).collect(Collectors.toList());
 		for (SimpleTransaction transaction : transactions) {
 			balance += transaction.getTotalAmount();
@@ -409,9 +422,6 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 			Set<BitcoinyTransaction> walletTransactions = new HashSet<>();
 			Set<String> keySet = new HashSet<>();
 
-			// Set the number of consecutive empty batches required before giving up
-			final int numberOfAdditionalBatchesToSearch = 7;
-
 			int unusedCounter = 0;
 			int ki = 0;
 			do {
@@ -438,12 +448,12 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 
 				if (areAllKeysUnused) {
 					// No transactions
-					if (unusedCounter >= numberOfAdditionalBatchesToSearch) {
+					if (unusedCounter >= Settings.getInstance().getGapLimit()) {
 						// ... and we've hit our search limit
 						break;
 					}
 					// We haven't hit our search limit yet so increment the counter and keep looking
-					unusedCounter++;
+					unusedCounter += WALLET_KEY_LOOKAHEAD_INCREMENT;
 				} else {
 					// Some keys in this batch were used, so reset the counter
 					unusedCounter = 0;
@@ -455,7 +465,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 				// Process new keys
 			} while (true);
 
-			Comparator<SimpleTransaction> newestTimestampFirstComparator = Comparator.comparingInt(SimpleTransaction::getTimestamp).reversed();
+			Comparator<SimpleTransaction> newestTimestampFirstComparator = Comparator.comparingLong(SimpleTransaction::getTimestamp).reversed();
 
 			// Update cache and return
 			transactionsCacheTimestamp = NTP.getTime();
@@ -468,6 +478,64 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 		}
 	}
 
+	public Set<String> getWalletAddresses(String key58) throws ForeignBlockchainException {
+		synchronized (this) {
+			Context.propagate(bitcoinjContext);
+
+			Wallet wallet = walletFromDeterministicKey58(key58);
+			DeterministicKeyChain keyChain = wallet.getActiveKeyChain();
+
+			keyChain.setLookaheadSize(Bitcoiny.WALLET_KEY_LOOKAHEAD_INCREMENT);
+			keyChain.maybeLookAhead();
+
+			List<DeterministicKey> keys = new ArrayList<>(keyChain.getLeafKeys());
+
+			Set<String> keySet = new HashSet<>();
+
+			int unusedCounter = 0;
+			int ki = 0;
+			do {
+				boolean areAllKeysUnused = true;
+
+				for (; ki < keys.size(); ++ki) {
+					DeterministicKey dKey = keys.get(ki);
+
+					// Check for transactions
+					Address address = Address.fromKey(this.params, dKey, ScriptType.P2PKH);
+					keySet.add(address.toString());
+					byte[] script = ScriptBuilder.createOutputScript(address).getProgram();
+
+					// Ask for transaction history - if it's empty then key has never been used
+					List<TransactionHash> historicTransactionHashes = this.getAddressTransactions(script, false);
+
+					if (!historicTransactionHashes.isEmpty()) {
+						areAllKeysUnused = false;
+					}
+				}
+
+				if (areAllKeysUnused) {
+					// No transactions
+					if (unusedCounter >= Settings.getInstance().getGapLimit()) {
+						// ... and we've hit our search limit
+						break;
+					}
+					// We haven't hit our search limit yet so increment the counter and keep looking
+					unusedCounter += WALLET_KEY_LOOKAHEAD_INCREMENT;
+				} else {
+					// Some keys in this batch were used, so reset the counter
+					unusedCounter = 0;
+				}
+
+				// Generate some more keys
+				keys.addAll(generateMoreKeys(keyChain));
+
+				// Process new keys
+			} while (true);
+
+			return keySet;
+		}
+	}
+
 	protected SimpleTransaction convertToSimpleTransaction(BitcoinyTransaction t, Set<String> keySet) {
 		long amount = 0;
 		long total = 0L;
@@ -537,7 +605,8 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 			// All inputs and outputs relate to this wallet, so the balance should be unaffected
 			amount = 0;
 		}
-		return new SimpleTransaction(t.txHash, t.timestamp, amount, fee, inputs, outputs);
+		long timestampMillis = t.timestamp * 1000L;
+		return new SimpleTransaction(t.txHash, timestampMillis, amount, fee, inputs, outputs, null);
 	}
 
 	/**
@@ -573,7 +642,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 				Address address = Address.fromKey(this.params, dKey, ScriptType.P2PKH);
 				byte[] script = ScriptBuilder.createOutputScript(address).getProgram();
 
-				List<UnspentOutput> unspentOutputs = this.blockchain.getUnspentOutputs(script, false);
+				List<UnspentOutput> unspentOutputs = this.blockchainProvider.getUnspentOutputs(script, false);
 
 				/*
 				 * If there are no unspent outputs then either:
@@ -591,7 +660,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 					}
 
 					// Ask for transaction history - if it's empty then key has never been used
-					List<TransactionHash> historicTransactionHashes = this.blockchain.getAddressTransactions(script, false);
+					List<TransactionHash> historicTransactionHashes = this.blockchainProvider.getAddressTransactions(script, false);
 
 					if (!historicTransactionHashes.isEmpty()) {
 						// Fully spent key - case (a)
@@ -629,7 +698,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 			this.keyChain = this.wallet.getActiveKeyChain();
 
 			// Set up wallet's key chain
-			this.keyChain.setLookaheadSize(Bitcoiny.WALLET_KEY_LOOKAHEAD_INCREMENT_BITCOINJ);
+			this.keyChain.setLookaheadSize(Settings.getInstance().getBitcoinjLookaheadSize());
 			this.keyChain.maybeLookAhead();
 		}
 
@@ -650,7 +719,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 
 					List<UnspentOutput> unspentOutputs;
 					try {
-						unspentOutputs = this.bitcoiny.blockchain.getUnspentOutputs(script, false);
+						unspentOutputs = this.bitcoiny.blockchainProvider.getUnspentOutputs(script, false);
 					} catch (ForeignBlockchainException e) {
 						throw new UTXOProviderException(String.format("Unable to fetch unspent outputs for %s", address));
 					}
@@ -674,7 +743,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 						// Ask for transaction history - if it's empty then key has never been used
 						List<TransactionHash> historicTransactionHashes;
 						try {
-							historicTransactionHashes = this.bitcoiny.blockchain.getAddressTransactions(script, false);
+							historicTransactionHashes = this.bitcoiny.blockchainProvider.getAddressTransactions(script, false);
 						} catch (ForeignBlockchainException e) {
 							throw new UTXOProviderException(String.format("Unable to fetch transaction history for %s", address));
 						}
@@ -727,7 +796,7 @@ public abstract class Bitcoiny implements ForeignBlockchain {
 		@Override
 		public int getChainHeadHeight() throws UTXOProviderException {
 			try {
-				return this.bitcoiny.blockchain.getCurrentHeight();
+				return this.bitcoiny.blockchainProvider.getCurrentHeight();
 			} catch (ForeignBlockchainException e) {
 				throw new UTXOProviderException("Unable to determine Bitcoiny chain height");
 			}

src/main/java/org/qortal/crosschain/BitcoinyBlockchainProvider.java

@@ -1,5 +1,7 @@
 package org.qortal.crosschain;
 
+import cash.z.wallet.sdk.rpc.CompactFormats.*;
+
 import java.util.List;
 
 public abstract class BitcoinyBlockchainProvider {
@@ -7,18 +9,32 @@ public abstract class BitcoinyBlockchainProvider {
 	public static final boolean INCLUDE_UNCONFIRMED = true;
 	public static final boolean EXCLUDE_UNCONFIRMED = false;
 
+	/** Sets the blockchain using this provider instance */
+	public abstract void setBlockchain(Bitcoiny blockchain);
+
 	/** Returns ID unique to bitcoiny network (e.g. "Litecoin-TEST3") */
 	public abstract String getNetId();
 
 	/** Returns current blockchain height. */
 	public abstract int getCurrentHeight() throws ForeignBlockchainException;
 
+	/** Returns a list of compact blocks, starting at <tt>startHeight</tt> (inclusive), up to <tt>count</tt> max.
+	 * Used for Pirate/Zcash only. If ever needed for other blockchains, the response format will need to be
+	 * made generic. */
+	public abstract List<CompactBlock> getCompactBlocks(int startHeight, int count) throws ForeignBlockchainException;
+
 	/** Returns a list of raw block headers, starting at <tt>startHeight</tt> (inclusive), up to <tt>count</tt> max. */
 	public abstract List<byte[]> getRawBlockHeaders(int startHeight, int count) throws ForeignBlockchainException;
 
+	/** Returns a list of block timestamps, starting at <tt>startHeight</tt> (inclusive), up to <tt>count</tt> max. */
+	public abstract List<Long> getBlockTimestamps(int startHeight, int count) throws ForeignBlockchainException;
+
 	/** Returns balance of address represented by <tt>scriptPubKey</tt>. */
 	public abstract long getConfirmedBalance(byte[] scriptPubKey) throws ForeignBlockchainException;
 
+	/** Returns balance of base58 encoded address. */
+	public abstract long getConfirmedAddressBalance(String base58Address) throws ForeignBlockchainException;
+
 	/** Returns raw, serialized, transaction bytes given <tt>txHash</tt>. */
 	public abstract byte[] getRawTransaction(String txHash) throws ForeignBlockchainException;
 
@@ -31,6 +47,12 @@ public abstract class BitcoinyBlockchainProvider {
 	/** Returns list of transaction hashes (and heights) for address represented by <tt>scriptPubKey</tt>, optionally including unconfirmed transactions. */
 	public abstract List<TransactionHash> getAddressTransactions(byte[] scriptPubKey, boolean includeUnconfirmed) throws ForeignBlockchainException;
 
+	/** Returns list of BitcoinyTransaction objects for <tt>address</tt>, optionally including unconfirmed transactions. */
+	public abstract List<BitcoinyTransaction> getAddressBitcoinyTransactions(String address, boolean includeUnconfirmed) throws ForeignBlockchainException;
+
+		/** Returns list of unspent transaction outputs for <tt>address</tt>, optionally including unconfirmed transactions. */
+	public abstract List<UnspentOutput> getUnspentOutputs(String address, boolean includeUnconfirmed) throws ForeignBlockchainException;
+
 	/** Returns list of unspent transaction outputs for address represented by <tt>scriptPubKey</tt>, optionally including unconfirmed transactions. */
 	public abstract List<UnspentOutput> getUnspentOutputs(byte[] scriptPubKey, boolean includeUnconfirmed) throws ForeignBlockchainException;
 

src/main/java/org/qortal/crosschain/BitcoinyTransaction.java

@@ -1,5 +1,6 @@
 package org.qortal.crosschain;
 
+import java.util.Comparator;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -10,8 +11,13 @@ import javax.xml.bind.annotation.XmlTransient;
 @XmlAccessorType(XmlAccessType.FIELD)
 public class BitcoinyTransaction {
 
+	public static final Comparator<BitcoinyTransaction> CONFIRMED_FIRST = (a, b) -> Boolean.compare(a.height != 0, b.height != 0);
+
 	public final String txHash;
 
+	@XmlTransient
+	public Integer height;
+
 	@XmlTransient
 	public final int size;
 
@@ -113,6 +119,10 @@ public class BitcoinyTransaction {
 		this.totalAmount = outputs.stream().map(output -> output.value).reduce(0L, Long::sum);
 	}
 
+	public int getHeight() {
+		return this.height;
+	}
+
 	public String toString() {
 		return String.format("txHash %s, size %d, locktime %d, timestamp %d\n"
 				+ "\tinputs: [%s]\n"

src/main/java/org/qortal/crosschain/Digibyte.java

@@ -134,6 +134,8 @@ public class Digibyte extends Bitcoiny {
 			Context bitcoinjContext = new Context(digibyteNet.getParams());
 
 			instance = new Digibyte(digibyteNet, electrumX, bitcoinjContext, CURRENCY_CODE);
+
+			electrumX.setBlockchain(instance);
 		}
 
 		return instance;

src/main/java/org/qortal/crosschain/Dogecoin.java

@@ -47,7 +47,8 @@ public class Dogecoin extends Bitcoiny {
 						// Servers chosen on NO BASIS WHATSOEVER from various sources!
 						new Server("electrum1.cipig.net", ConnectionType.SSL, 20060),
 						new Server("electrum2.cipig.net", ConnectionType.SSL, 20060),
-						new Server("electrum3.cipig.net", ConnectionType.SSL, 20060));
+						new Server("electrum3.cipig.net", ConnectionType.SSL, 20060),
+						new Server("161.97.137.235", ConnectionType.SSL, 50002));
 						// TODO: add more mainnet servers. It's too centralized.
 			}
 
@@ -135,6 +136,8 @@ public class Dogecoin extends Bitcoiny {
 			Context bitcoinjContext = new Context(dogecoinNet.getParams());
 
 			instance = new Dogecoin(dogecoinNet, electrumX, bitcoinjContext, CURRENCY_CODE);
+
+			electrumX.setBlockchain(instance);
 		}
 
 		return instance;

src/main/java/org/qortal/crosschain/ElectrumX.java

@@ -5,12 +5,14 @@ import java.math.BigDecimal;
 import java.net.InetSocketAddress;
 import java.net.Socket;
 import java.net.SocketAddress;
+import java.text.DecimalFormat;
 import java.util.*;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import javax.net.ssl.SSLSocketFactory;
 
+import cash.z.wallet.sdk.rpc.CompactFormats.*;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.json.simple.JSONArray;
@@ -29,7 +31,11 @@ public class ElectrumX extends BitcoinyBlockchainProvider {
 	private static final Logger LOGGER = LogManager.getLogger(ElectrumX.class);
 	private static final Random RANDOM = new Random();
 
+	// See: https://electrumx.readthedocs.io/en/latest/protocol-changes.html
 	private static final double MIN_PROTOCOL_VERSION = 1.2;
+	private static final double MAX_PROTOCOL_VERSION = 2.0; // Higher than current latest, for hopeful future-proofing
+	private static final String CLIENT_NAME = "Qortal";
+
 	private static final int BLOCK_HEADER_LENGTH = 80;
 
 	// "message": "daemon error: DaemonError({'code': -5, 'message': 'No such mempool or blockchain transaction. Use gettransaction for wallet transactions.'})"
@@ -39,7 +45,7 @@ public class ElectrumX extends BitcoinyBlockchainProvider {
 	private static final String VERBOSE_TRANSACTIONS_UNSUPPORTED_MESSAGE = "verbose transactions are currently unsupported";
 
 	private static final int RESPONSE_TIME_READINGS = 5;
-	private static final long MAX_AVG_RESPONSE_TIME = 500L; // ms
+	private static final long MAX_AVG_RESPONSE_TIME = 1000L; // ms
 
 	public static class Server {
 		String hostname;
@@ -107,6 +113,7 @@ public class ElectrumX extends BitcoinyBlockchainProvider {
 	private final String netId;
 	private final String expectedGenesisHash;
 	private final Map<Server.ConnectionType, Integer> defaultPorts = new EnumMap<>(Server.ConnectionType.class);
+	private Bitcoiny blockchain;
 
 	private final Object serverLock = new Object();
 	private Server currentServer;
@@ -135,6 +142,11 @@ public class ElectrumX extends BitcoinyBlockchainProvider {
 
 	// Methods for use by other classes
 
+	@Override
+	public void setBlockchain(Bitcoiny blockchain) {
+		this.blockchain = blockchain;
+	}
+
 	@Override
 	public String getNetId() {
 		return this.netId;
@@ -161,6 +173,16 @@ public class ElectrumX extends BitcoinyBlockchainProvider {
 		return ((Long) heightObj).intValue();
 	}
 
+	/**
+	 * Returns list of raw blocks, starting from <tt>startHeight</tt> inclusive.
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	@Override
+	public List<CompactBlock> getCompactBlocks(int startHeight, int count) throws ForeignBlockchainException {
+		throw new ForeignBlockchainException("getCompactBlocks not implemented for ElectrumX due to being specific to zcash");
+	}
+
 	/**
 	 * Returns list of raw block headers, starting from <tt>startHeight</tt> inclusive.
 	 * <p>
@@ -222,6 +244,17 @@ public class ElectrumX extends BitcoinyBlockchainProvider {
 		return rawBlockHeaders;
 	}
 
+	/**
+	 * Returns list of raw block timestamps, starting from <tt>startHeight</tt> inclusive.
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	@Override
+	public List<Long> getBlockTimestamps(int startHeight, int count) throws ForeignBlockchainException {
+		// FUTURE: implement this if needed. For now we use getRawBlockHeaders directly
+		throw new ForeignBlockchainException("getBlockTimestamps not yet implemented for ElectrumX");
+	}
+
 	/**
 	 * Returns confirmed balance, based on passed payment script.
 	 * <p>
@@ -247,6 +280,29 @@ public class ElectrumX extends BitcoinyBlockchainProvider {
 		return (Long) balanceJson.get("confirmed");
 	}
 
+	/**
+	 * Returns confirmed balance, based on passed base58 encoded address.
+	 * <p>
+	 * @return confirmed balance, or zero if address unknown
+	 * @throws ForeignBlockchainException if there was an error
+	 */
+	@Override
+	public long getConfirmedAddressBalance(String base58Address) throws ForeignBlockchainException {
+		throw new ForeignBlockchainException("getConfirmedAddressBalance not yet implemented for ElectrumX");
+	}
+
+	/**
+	 * Returns list of unspent outputs pertaining to passed address.
+	 * <p>
+	 * @return list of unspent outputs, or empty list if address unknown
+	 * @throws ForeignBlockchainException if there was an error.
+	 */
+	@Override
+	public List<UnspentOutput> getUnspentOutputs(String address, boolean includeUnconfirmed) throws ForeignBlockchainException {
+		byte[] script = this.blockchain.addressToScriptPubKey(address);
+		return this.getUnspentOutputs(script, includeUnconfirmed);
+	}
+
 	/**
 	 * Returns list of unspent outputs pertaining to passed payment script.
 	 * <p>
@@ -482,6 +538,12 @@ public class ElectrumX extends BitcoinyBlockchainProvider {
 		return transactionHashes;
 	}
 
+	@Override
+	public List<BitcoinyTransaction> getAddressBitcoinyTransactions(String address, boolean includeUnconfirmed) throws ForeignBlockchainException {
+		// FUTURE: implement this if needed. For now we use getAddressTransactions() + getTransaction()
+		throw new ForeignBlockchainException("getAddressBitcoinyTransactions not yet implemented for ElectrumX");
+	}
+
 	/**
 	 * Broadcasts raw transaction to network.
 	 * <p>
@@ -622,6 +684,9 @@ public class ElectrumX extends BitcoinyBlockchainProvider {
 				this.scanner = new Scanner(this.socket.getInputStream());
 				this.scanner.useDelimiter("\n");
 
+				// All connections need to start with a version negotiation
+				this.connectedRpc("server.version");
+
 				// Check connection is suitable by asking for server features, including genesis block hash
 				JSONObject featuresJson = (JSONObject) this.connectedRpc("server.features");
 
@@ -668,6 +733,17 @@ public class ElectrumX extends BitcoinyBlockchainProvider {
 
 		JSONArray requestParams = new JSONArray();
 		requestParams.addAll(Arrays.asList(params));
+
+		// server.version needs additional params to negotiate a version
+		if (method.equals("server.version")) {
+			requestParams.add(CLIENT_NAME);
+			List<String> versions = new ArrayList<>();
+			DecimalFormat df = new DecimalFormat("#.#");
+			versions.add(df.format(MIN_PROTOCOL_VERSION));
+			versions.add(df.format(MAX_PROTOCOL_VERSION));
+			requestParams.add(versions);
+		}
+
 		requestJson.put("params", requestParams);
 
 		String request = requestJson.toJSONString() + "\n";
@@ -682,6 +758,10 @@ public class ElectrumX extends BitcoinyBlockchainProvider {
 		} catch (IOException | NoSuchElementException e) {
 			// Unable to send, or receive -- try another server?
 			return null;
+		} catch (NoSuchMethodError e) {
+			// Likely an SSL dependency issue - retries are unlikely to succeed
+			LOGGER.error("ElectrumX output stream error", e);
+			return null;
 		}
 
 		long endTime = System.currentTimeMillis();

src/main/java/org/qortal/crosschain/LegacyZcashAddress.java

@@ -0,0 +1,254 @@
+/*
+ * Copyright 2011 Google Inc.
+ * Copyright 2014 Giannis Dzegoutanis
+ * Copyright 2015 Andreas Schildbach
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Updated for Zcash in May 2022 by Qortal core dev team. Modifications allow
+* correct encoding of P2SH (t3) addresses only. */
+
+package org.qortal.crosschain;
+
+import org.bitcoinj.core.*;
+import org.bitcoinj.params.Networks;
+import org.bitcoinj.script.Script.ScriptType;
+
+import javax.annotation.Nullable;
+import java.util.Arrays;
+import java.util.Objects;
+
+/**
+ * <p>A Bitcoin address looks like 1MsScoe2fTJoq4ZPdQgqyhgWeoNamYPevy and is derived from an elliptic curve public key
+ * plus a set of network parameters. Not to be confused with a {@link PeerAddress} or {@link AddressMessage}
+ * which are about network (TCP) addresses.</p>
+ *
+ * <p>A standard address is built by taking the RIPE-MD160 hash of the public key bytes, with a version prefix and a
+ * checksum suffix, then encoding it textually as base58. The version prefix is used to both denote the network for
+ * which the address is valid (see {@link NetworkParameters}, and also to indicate how the bytes inside the address
+ * should be interpreted. Whilst almost all addresses today are hashes of public keys, another (currently unsupported
+ * type) can contain a hash of a script instead.</p>
+ */
+public class LegacyZcashAddress extends Address {
+    /**
+     * An address is a RIPEMD160 hash of a public key, therefore is always 160 bits or 20 bytes.
+     */
+    public static final int LENGTH = 20;
+
+    /** True if P2SH, false if P2PKH. */
+    public final boolean p2sh;
+
+    /* Zcash P2SH header bytes */
+    private static int P2SH_HEADER_1 = 28;
+    private static int P2SH_HEADER_2 = 189;
+
+    /**
+     * Private constructor. Use {@link #fromBase58(NetworkParameters, String)},
+     * {@link #fromPubKeyHash(NetworkParameters, byte[])}, {@link #fromScriptHash(NetworkParameters, byte[])} or
+     * {@link #fromKey(NetworkParameters, ECKey)}.
+     * 
+     * @param params
+     *            network this address is valid for
+     * @param p2sh
+     *            true if hash160 is hash of a script, false if it is hash of a pubkey
+     * @param hash160
+     *            20-byte hash of pubkey or script
+     */
+    private LegacyZcashAddress(NetworkParameters params, boolean p2sh, byte[] hash160) throws AddressFormatException {
+        super(params, hash160);
+        if (hash160.length != 20)
+            throw new AddressFormatException.InvalidDataLength(
+                    "Legacy addresses are 20 byte (160 bit) hashes, but got: " + hash160.length);
+        this.p2sh = p2sh;
+    }
+
+    /**
+     * Construct a {@link LegacyZcashAddress} that represents the given pubkey hash. The resulting address will be a P2PKH type of
+     * address.
+     * 
+     * @param params
+     *            network this address is valid for
+     * @param hash160
+     *            20-byte pubkey hash
+     * @return constructed address
+     */
+    public static LegacyZcashAddress fromPubKeyHash(NetworkParameters params, byte[] hash160) throws AddressFormatException {
+        return new LegacyZcashAddress(params, false, hash160);
+    }
+
+    /**
+     * Construct a {@link LegacyZcashAddress} that represents the public part of the given {@link ECKey}. Note that an address is
+     * derived from a hash of the public key and is not the public key itself.
+     * 
+     * @param params
+     *            network this address is valid for
+     * @param key
+     *            only the public part is used
+     * @return constructed address
+     */
+    public static LegacyZcashAddress fromKey(NetworkParameters params, ECKey key) {
+        return fromPubKeyHash(params, key.getPubKeyHash());
+    }
+
+    /**
+     * Construct a {@link LegacyZcashAddress} that represents the given P2SH script hash.
+     * 
+     * @param params
+     *            network this address is valid for
+     * @param hash160
+     *            P2SH script hash
+     * @return constructed address
+     */
+    public static LegacyZcashAddress fromScriptHash(NetworkParameters params, byte[] hash160) throws AddressFormatException {
+        return new LegacyZcashAddress(params, true, hash160);
+    }
+
+    /**
+     * Construct a {@link LegacyZcashAddress} from its base58 form.
+     * 
+     * @param params
+     *            expected network this address is valid for, or null if if the network should be derived from the
+     *            base58
+     * @param base58
+     *            base58-encoded textual form of the address
+     * @throws AddressFormatException
+     *             if the given base58 doesn't parse or the checksum is invalid
+     * @throws AddressFormatException.WrongNetwork
+     *             if the given address is valid but for a different chain (eg testnet vs mainnet)
+     */
+    public static LegacyZcashAddress fromBase58(@Nullable NetworkParameters params, String base58)
+            throws AddressFormatException, AddressFormatException.WrongNetwork {
+        byte[] versionAndDataBytes = Base58.decodeChecked(base58);
+        int version = versionAndDataBytes[0] & 0xFF;
+        byte[] bytes = Arrays.copyOfRange(versionAndDataBytes, 1, versionAndDataBytes.length);
+        if (params == null) {
+            for (NetworkParameters p : Networks.get()) {
+                if (version == p.getAddressHeader())
+                    return new LegacyZcashAddress(p, false, bytes);
+                else if (version == p.getP2SHHeader())
+                    return new LegacyZcashAddress(p, true, bytes);
+            }
+            throw new AddressFormatException.InvalidPrefix("No network found for " + base58);
+        } else {
+            if (version == params.getAddressHeader())
+                return new LegacyZcashAddress(params, false, bytes);
+            else if (version == params.getP2SHHeader())
+                return new LegacyZcashAddress(params, true, bytes);
+            throw new AddressFormatException.WrongNetwork(version);
+        }
+    }
+
+    /**
+     * Get the version header of an address. This is the first byte of a base58 encoded address.
+     * 
+     * @return version header as one byte
+     */
+    public int getVersion() {
+        return p2sh ? params.getP2SHHeader() : params.getAddressHeader();
+    }
+
+    /**
+     * Returns the base58-encoded textual form, including version and checksum bytes.
+     * 
+     * @return textual form
+     */
+    public String toBase58() {
+        return this.encodeChecked(getVersion(), bytes);
+    }
+
+    /** The (big endian) 20 byte hash that is the core of a Bitcoin address. */
+    @Override
+    public byte[] getHash() {
+        return bytes;
+    }
+
+    /**
+     * Get the type of output script that will be used for sending to the address. This is either
+     * {@link ScriptType#P2PKH} or {@link ScriptType#P2SH}.
+     * 
+     * @return type of output script
+     */
+    @Override
+    public ScriptType getOutputScriptType() {
+        return p2sh ? ScriptType.P2SH : ScriptType.P2PKH;
+    }
+
+    /**
+     * Given an address, examines the version byte and attempts to find a matching NetworkParameters. If you aren't sure
+     * which network the address is intended for (eg, it was provided by a user), you can use this to decide if it is
+     * compatible with the current wallet.
+     * 
+     * @return network the address is valid for
+     * @throws AddressFormatException if the given base58 doesn't parse or the checksum is invalid
+     */
+    public static NetworkParameters getParametersFromAddress(String address) throws AddressFormatException {
+        return LegacyZcashAddress.fromBase58(null, address).getParameters();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+        LegacyZcashAddress other = (LegacyZcashAddress) o;
+        return super.equals(other) && this.p2sh == other.p2sh;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), p2sh);
+    }
+
+    @Override
+    public String toString() {
+        return toBase58();
+    }
+
+    @Override
+    public LegacyZcashAddress clone() throws CloneNotSupportedException {
+        return (LegacyZcashAddress) super.clone();
+    }
+
+    public static String encodeChecked(int version, byte[] payload) {
+        if (version < 0 || version > 255)
+            throw new IllegalArgumentException("Version not in range.");
+
+        // A stringified buffer is:
+        // 1 byte version + data bytes + 4 bytes check code (a truncated hash)
+        byte[] addressBytes = new byte[2 + payload.length + 4];
+        addressBytes[0] = (byte) P2SH_HEADER_1;
+        addressBytes[1] = (byte) P2SH_HEADER_2;
+        System.arraycopy(payload, 0, addressBytes, 2, payload.length);
+        byte[] checksum = Sha256Hash.hashTwice(addressBytes, 0, payload.length + 2);
+        System.arraycopy(checksum, 0, addressBytes, payload.length + 2, 4);
+        return Base58.encode(addressBytes);
+    }
+
+//    // Comparator for LegacyAddress, left argument must be LegacyAddress, right argument can be any Address
+//    private static final Comparator<Address> LEGACY_ADDRESS_COMPARATOR = Address.PARTIAL_ADDRESS_COMPARATOR
+//            .thenComparingInt(a -> ((LegacyZcashAddress) a).getVersion())                    // Then compare Legacy address version byte
+//            .thenComparing(a -> a.bytes, UnsignedBytes.lexicographicalComparator());    // Then compare Legacy bytes
+//
+//    /**
+//     * {@inheritDoc}
+//     *
+//     * @param o other {@code Address} object
+//     * @return comparison result
+//     */
+//    @Override
+//    public int compareTo(Address o) {
+//       return LEGACY_ADDRESS_COMPARATOR.compare(this, o);
+//    }
+}

src/main/java/org/qortal/crosschain/Litecoin.java

@@ -54,7 +54,8 @@ public class Litecoin extends Bitcoiny {
 						new Server("electrum2.cipig.net", Server.ConnectionType.SSL, 20063),
 						new Server("electrum3.cipig.net", Server.ConnectionType.SSL, 20063),
 						new Server("ltc.litepay.ch", Server.ConnectionType.SSL, 50022),
-						new Server("ltc.rentonrisk.com", Server.ConnectionType.SSL, 50002));
+						new Server("ltc.rentonrisk.com", Server.ConnectionType.SSL, 50002),
+						new Server("62.171.169.176", Server.ConnectionType.SSL, 50002));
 			}
 
 			@Override
@@ -145,6 +146,8 @@ public class Litecoin extends Bitcoiny {
 			Context bitcoinjContext = new Context(litecoinNet.getParams());
 
 			instance = new Litecoin(litecoinNet, electrumX, bitcoinjContext, CURRENCY_CODE);
+
+			electrumX.setBlockchain(instance);
 		}
 
 		return instance;

src/main/java/org/qortal/crosschain/LitecoinACCTv2.java

@@ -1,854 +0,0 @@
-package org.qortal.crosschain;
-
-import com.google.common.hash.HashCode;
-import com.google.common.primitives.Bytes;
-import org.ciyam.at.*;
-import org.qortal.account.Account;
-import org.qortal.asset.Asset;
-import org.qortal.at.QortalFunctionCode;
-import org.qortal.crypto.Crypto;
-import org.qortal.data.at.ATData;
-import org.qortal.data.at.ATStateData;
-import org.qortal.data.crosschain.CrossChainTradeData;
-import org.qortal.data.transaction.MessageTransactionData;
-import org.qortal.repository.DataException;
-import org.qortal.repository.Repository;
-import org.qortal.utils.Base58;
-import org.qortal.utils.BitTwiddling;
-
-import java.nio.ByteBuffer;
-import java.util.Arrays;
-import java.util.List;
-
-import static org.ciyam.at.OpCode.calcOffset;
-
-/**
- * Cross-chain trade AT
- * 
- * <p>
- * <ul>
- * <li>Bob generates Litecoin & Qortal 'trade' keys
- * 		<ul>
- * 			<li>private key required to sign P2SH redeem tx</li>
- * 			<li>private key could be used to create 'secret' (e.g. double-SHA256)</li>
- * 			<li>encrypted private key could be stored in Qortal AT for access by Bob from any node</li>
- * 		</ul>
- * </li>
- * <li>Bob deploys Qortal AT
- * 		<ul>
- * 		</ul>
- * </li>
- * <li>Alice finds Qortal AT and wants to trade
- * 		<ul>
- * 			<li>Alice generates Litecoin & Qortal 'trade' keys</li>
- * 			<li>Alice funds Litecoin P2SH-A</li>
- * 			<li>Alice sends 'offer' MESSAGE to Bob from her Qortal trade address, containing:
- * 				<ul>
- * 					<li>hash-of-secret-A</li>
- * 					<li>her 'trade' Litecoin PKH</li>
- * 				</ul>
- * 			</li>
- * 		</ul>
- * </li>
- * <li>Bob receives "offer" MESSAGE
- * 		<ul>
- * 			<li>Checks Alice's P2SH-A</li>
- * 			<li>Sends 'trade' MESSAGE to Qortal AT from his trade address, containing:
- * 				<ul>
- * 					<li>Alice's trade Qortal address</li>
- * 					<li>Alice's trade Litecoin PKH</li>
- * 					<li>hash-of-secret-A</li>
- * 				</ul>
- * 			</li>
- * 		</ul>
- * </li>
- * <li>Alice checks Qortal AT to confirm it's locked to her
- * 		<ul>
- * 			<li>Alice sends 'redeem' MESSAGE to Qortal AT from her trade address, containing:
- * 				<ul>
- * 					<li>secret-A</li>
- * 					<li>Qortal receiving address of her chosing</li>
- * 				</ul>
- * 			</li>
- * 			<li>AT's QORT funds are sent to Qortal receiving address</li>
- * 		</ul>
- * </li>
- * <li>Bob checks AT, extracts secret-A
- * 		<ul>
- * 			<li>Bob redeems P2SH-A using his Litecoin trade key and secret-A</li>
- * 			<li>P2SH-A LTC funds end up at Litecoin address determined by redeem transaction output(s)</li>
- * 		</ul>
- * </li>
- * </ul>
- */
-public class LitecoinACCTv2 implements ACCT {
-
-	public static final String NAME = LitecoinACCTv2.class.getSimpleName();
-	public static final byte[] CODE_BYTES_HASH = HashCode.fromString("d5ea386a41441180c854ca8d7bbc620bfd53a97df2650a2b162b52324caf6e19").asBytes(); // SHA256 of AT code bytes
-
-	public static final int SECRET_LENGTH = 32;
-
-	/** <b>Value</b> offset into AT segment where 'mode' variable (long) is stored. (Multiply by MachineState.VALUE_SIZE for byte offset). */
-	private static final int MODE_VALUE_OFFSET = 61;
-	/** <b>Byte</b> offset into AT state data where 'mode' variable (long) is stored. */
-	public static final int MODE_BYTE_OFFSET = MachineState.HEADER_LENGTH + (MODE_VALUE_OFFSET * MachineState.VALUE_SIZE);
-
-	public static class OfferMessageData {
-		public byte[] partnerLitecoinPKH;
-		public byte[] hashOfSecretA;
-		public long lockTimeA;
-	}
-	public static final int OFFER_MESSAGE_LENGTH = 20 /*partnerLitecoinPKH*/ + 20 /*hashOfSecretA*/ + 8 /*lockTimeA*/;
-	public static final int TRADE_MESSAGE_LENGTH = 32 /*partner's Qortal trade address (padded from 25 to 32)*/
-			+ 24 /*partner's Litecoin PKH (padded from 20 to 24)*/
-			+ 8 /*AT trade timeout (minutes)*/
-			+ 24 /*hash of secret-A (padded from 20 to 24)*/
-			+ 8 /*lockTimeA*/;
-	public static final int REDEEM_MESSAGE_LENGTH = 32 /*secret-A*/ + 32 /*partner's Qortal receiving address padded from 25 to 32*/;
-	public static final int CANCEL_MESSAGE_LENGTH = 32 /*AT creator's Qortal address*/;
-
-	private static LitecoinACCTv2 instance;
-
-	private LitecoinACCTv2() {
-	}
-
-	public static synchronized LitecoinACCTv2 getInstance() {
-		if (instance == null)
-			instance = new LitecoinACCTv2();
-
-		return instance;
-	}
-
-	@Override
-	public byte[] getCodeBytesHash() {
-		return CODE_BYTES_HASH;
-	}
-
-	@Override
-	public int getModeByteOffset() {
-		return MODE_BYTE_OFFSET;
-	}
-
-	@Override
-	public ForeignBlockchain getBlockchain() {
-		return Litecoin.getInstance();
-	}
-
-	/**
-	 * Returns Qortal AT creation bytes for cross-chain trading AT.
-	 * <p>
-	 * <tt>tradeTimeout</tt> (minutes) is the time window for the trade partner to send the
-	 * 32-byte secret to the AT, before the AT automatically refunds the AT's creator.
-	 * 
-	 * @param creatorTradeAddress AT creator's trade Qortal address
-	 * @param litecoinPublicKeyHash 20-byte HASH160 of creator's trade Litecoin public key
-	 * @param qortAmount how much QORT to pay trade partner if they send correct 32-byte secrets to AT
-	 * @param litecoinAmount how much LTC the AT creator is expecting to trade
-	 * @param tradeTimeout suggested timeout for entire trade
-	 */
-	public static byte[] buildQortalAT(String creatorTradeAddress, byte[] litecoinPublicKeyHash, long qortAmount, long litecoinAmount, int tradeTimeout) {
-		if (litecoinPublicKeyHash.length != 20)
-			throw new IllegalArgumentException("Litecoin public key hash should be 20 bytes");
-
-		// Labels for data segment addresses
-		int addrCounter = 0;
-
-		// Constants (with corresponding dataByteBuffer.put*() calls below)
-
-		final int addrCreatorTradeAddress1 = addrCounter++;
-		final int addrCreatorTradeAddress2 = addrCounter++;
-		final int addrCreatorTradeAddress3 = addrCounter++;
-		final int addrCreatorTradeAddress4 = addrCounter++;
-
-		final int addrLitecoinPublicKeyHash = addrCounter;
-		addrCounter += 4;
-
-		final int addrQortAmount = addrCounter++;
-		final int addrLitecoinAmount = addrCounter++;
-		final int addrTradeTimeout = addrCounter++;
-
-		final int addrMessageTxnType = addrCounter++;
-		final int addrExpectedTradeMessageLength = addrCounter++;
-		final int addrExpectedRedeemMessageLength = addrCounter++;
-
-		final int addrCreatorAddressPointer = addrCounter++;
-		final int addrQortalPartnerAddressPointer = addrCounter++;
-		final int addrMessageSenderPointer = addrCounter++;
-
-		final int addrTradeMessagePartnerLitecoinPKHOffset = addrCounter++;
-		final int addrPartnerLitecoinPKHPointer = addrCounter++;
-		final int addrTradeMessageHashOfSecretAOffset = addrCounter++;
-		final int addrHashOfSecretAPointer = addrCounter++;
-
-		final int addrRedeemMessageReceivingAddressOffset = addrCounter++;
-
-		final int addrMessageDataPointer = addrCounter++;
-		final int addrMessageDataLength = addrCounter++;
-
-		final int addrPartnerReceivingAddressPointer = addrCounter++;
-
-		final int addrEndOfConstants = addrCounter;
-
-		// Variables
-
-		final int addrCreatorAddress1 = addrCounter++;
-		final int addrCreatorAddress2 = addrCounter++;
-		final int addrCreatorAddress3 = addrCounter++;
-		final int addrCreatorAddress4 = addrCounter++;
-
-		final int addrQortalPartnerAddress1 = addrCounter++;
-		final int addrQortalPartnerAddress2 = addrCounter++;
-		final int addrQortalPartnerAddress3 = addrCounter++;
-		final int addrQortalPartnerAddress4 = addrCounter++;
-
-		final int addrLockTimeA = addrCounter++;
-		final int addrRefundTimeout = addrCounter++;
-		final int addrRefundTimestamp = addrCounter++;
-		final int addrLastTxnTimestamp = addrCounter++;
-		final int addrBlockTimestamp = addrCounter++;
-		final int addrTxnType = addrCounter++;
-		final int addrResult = addrCounter++;
-
-		final int addrMessageSender1 = addrCounter++;
-		final int addrMessageSender2 = addrCounter++;
-		final int addrMessageSender3 = addrCounter++;
-		final int addrMessageSender4 = addrCounter++;
-
-		final int addrMessageLength = addrCounter++;
-
-		final int addrMessageData = addrCounter;
-		addrCounter += 4;
-
-		final int addrHashOfSecretA = addrCounter;
-		addrCounter += 4;
-
-		final int addrPartnerLitecoinPKH = addrCounter;
-		addrCounter += 4;
-
-		final int addrPartnerReceivingAddress = addrCounter;
-		addrCounter += 4;
-
-		final int addrMode = addrCounter++;
-		assert addrMode == MODE_VALUE_OFFSET : String.format("addrMode %d does not match MODE_VALUE_OFFSET %d", addrMode, MODE_VALUE_OFFSET);
-
-		// Data segment
-		ByteBuffer dataByteBuffer = ByteBuffer.allocate(addrCounter * MachineState.VALUE_SIZE);
-
-		// AT creator's trade Qortal address, decoded from Base58
-		assert dataByteBuffer.position() == addrCreatorTradeAddress1 * MachineState.VALUE_SIZE : "addrCreatorTradeAddress1 incorrect";
-		byte[] creatorTradeAddressBytes = Base58.decode(creatorTradeAddress);
-		dataByteBuffer.put(Bytes.ensureCapacity(creatorTradeAddressBytes, 32, 0));
-
-		// Litecoin public key hash
-		assert dataByteBuffer.position() == addrLitecoinPublicKeyHash * MachineState.VALUE_SIZE : "addrLitecoinPublicKeyHash incorrect";
-		dataByteBuffer.put(Bytes.ensureCapacity(litecoinPublicKeyHash, 32, 0));
-
-		// Redeem Qort amount
-		assert dataByteBuffer.position() == addrQortAmount * MachineState.VALUE_SIZE : "addrQortAmount incorrect";
-		dataByteBuffer.putLong(qortAmount);
-
-		// Expected Litecoin amount
-		assert dataByteBuffer.position() == addrLitecoinAmount * MachineState.VALUE_SIZE : "addrLitecoinAmount incorrect";
-		dataByteBuffer.putLong(litecoinAmount);
-
-		// Suggested trade timeout (minutes)
-		assert dataByteBuffer.position() == addrTradeTimeout * MachineState.VALUE_SIZE : "addrTradeTimeout incorrect";
-		dataByteBuffer.putLong(tradeTimeout);
-
-		// We're only interested in MESSAGE transactions
-		assert dataByteBuffer.position() == addrMessageTxnType * MachineState.VALUE_SIZE : "addrMessageTxnType incorrect";
-		dataByteBuffer.putLong(API.ATTransactionType.MESSAGE.value);
-
-		// Expected length of 'trade' MESSAGE data from AT creator
-		assert dataByteBuffer.position() == addrExpectedTradeMessageLength * MachineState.VALUE_SIZE : "addrExpectedTradeMessageLength incorrect";
-		dataByteBuffer.putLong(TRADE_MESSAGE_LENGTH);
-
-		// Expected length of 'redeem' MESSAGE data from trade partner
-		assert dataByteBuffer.position() == addrExpectedRedeemMessageLength * MachineState.VALUE_SIZE : "addrExpectedRedeemMessageLength incorrect";
-		dataByteBuffer.putLong(REDEEM_MESSAGE_LENGTH);
-
-		// Index into data segment of AT creator's address, used by GET_B_IND
-		assert dataByteBuffer.position() == addrCreatorAddressPointer * MachineState.VALUE_SIZE : "addrCreatorAddressPointer incorrect";
-		dataByteBuffer.putLong(addrCreatorAddress1);
-
-		// Index into data segment of partner's Qortal address, used by SET_B_IND
-		assert dataByteBuffer.position() == addrQortalPartnerAddressPointer * MachineState.VALUE_SIZE : "addrQortalPartnerAddressPointer incorrect";
-		dataByteBuffer.putLong(addrQortalPartnerAddress1);
-
-		// Index into data segment of (temporary) transaction's sender's address, used by GET_B_IND
-		assert dataByteBuffer.position() == addrMessageSenderPointer * MachineState.VALUE_SIZE : "addrMessageSenderPointer incorrect";
-		dataByteBuffer.putLong(addrMessageSender1);
-
-		// Offset into 'trade' MESSAGE data payload for extracting partner's Litecoin PKH
-		assert dataByteBuffer.position() == addrTradeMessagePartnerLitecoinPKHOffset * MachineState.VALUE_SIZE : "addrTradeMessagePartnerLitecoinPKHOffset incorrect";
-		dataByteBuffer.putLong(32L);
-
-		// Index into data segment of partner's Litecoin PKH, used by GET_B_IND
-		assert dataByteBuffer.position() == addrPartnerLitecoinPKHPointer * MachineState.VALUE_SIZE : "addrPartnerLitecoinPKHPointer incorrect";
-		dataByteBuffer.putLong(addrPartnerLitecoinPKH);
-
-		// Offset into 'trade' MESSAGE data payload for extracting hash-of-secret-A
-		assert dataByteBuffer.position() == addrTradeMessageHashOfSecretAOffset * MachineState.VALUE_SIZE : "addrTradeMessageHashOfSecretAOffset incorrect";
-		dataByteBuffer.putLong(64L);
-
-		// Index into data segment to hash of secret A, used by GET_B_IND
-		assert dataByteBuffer.position() == addrHashOfSecretAPointer * MachineState.VALUE_SIZE : "addrHashOfSecretAPointer incorrect";
-		dataByteBuffer.putLong(addrHashOfSecretA);
-
-		// Offset into 'redeem' MESSAGE data payload for extracting Qortal receiving address
-		assert dataByteBuffer.position() == addrRedeemMessageReceivingAddressOffset * MachineState.VALUE_SIZE : "addrRedeemMessageReceivingAddressOffset incorrect";
-		dataByteBuffer.putLong(32L);
-
-		// Source location and length for hashing any passed secret
-		assert dataByteBuffer.position() == addrMessageDataPointer * MachineState.VALUE_SIZE : "addrMessageDataPointer incorrect";
-		dataByteBuffer.putLong(addrMessageData);
-		assert dataByteBuffer.position() == addrMessageDataLength * MachineState.VALUE_SIZE : "addrMessageDataLength incorrect";
-		dataByteBuffer.putLong(32L);
-
-		// Pointer into data segment of where to save partner's receiving Qortal address, used by GET_B_IND
-		assert dataByteBuffer.position() == addrPartnerReceivingAddressPointer * MachineState.VALUE_SIZE : "addrPartnerReceivingAddressPointer incorrect";
-		dataByteBuffer.putLong(addrPartnerReceivingAddress);
-
-		assert dataByteBuffer.position() == addrEndOfConstants * MachineState.VALUE_SIZE : "dataByteBuffer position not at end of constants";
-
-		// Code labels
-		Integer labelRefund = null;
-
-		Integer labelTradeTxnLoop = null;
-		Integer labelCheckTradeTxn = null;
-		Integer labelCheckCancelTxn = null;
-		Integer labelNotTradeNorCancelTxn = null;
-		Integer labelCheckNonRefundTradeTxn = null;
-		Integer labelTradeTxnExtract = null;
-		Integer labelRedeemTxnLoop = null;
-		Integer labelCheckRedeemTxn = null;
-		Integer labelCheckRedeemTxnSender = null;
-		Integer labelPayout = null;
-
-		ByteBuffer codeByteBuffer = ByteBuffer.allocate(768);
-
-		// Two-pass version
-		for (int pass = 0; pass < 2; ++pass) {
-			codeByteBuffer.clear();
-
-			try {
-				/* Initialization */
-
-				// Use AT creation 'timestamp' as starting point for finding transactions sent to AT
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.GET_CREATION_TIMESTAMP, addrLastTxnTimestamp));
-
-				// Load B register with AT creator's address so we can save it into addrCreatorAddress1-4
-				codeByteBuffer.put(OpCode.EXT_FUN.compile(FunctionCode.PUT_CREATOR_INTO_B));
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrCreatorAddressPointer));
-
-				// Set restart position to after this opcode
-				codeByteBuffer.put(OpCode.SET_PCS.compile());
-
-				/* Loop, waiting for message from AT creator's trade address containing trade partner details, or AT owner's address to cancel offer */
-
-				/* Transaction processing loop */
-				labelTradeTxnLoop = codeByteBuffer.position();
-
-				/* Sleep until message arrives */
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(QortalFunctionCode.SLEEP_UNTIL_MESSAGE.value, addrLastTxnTimestamp));
-
-				// Find next transaction (if any) to this AT since the last one (referenced by addrLastTxnTimestamp)
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.PUT_TX_AFTER_TIMESTAMP_INTO_A, addrLastTxnTimestamp));
-				// If no transaction found, A will be zero. If A is zero, set addrResult to 1, otherwise 0.
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.CHECK_A_IS_ZERO, addrResult));
-				// If addrResult is zero (i.e. A is non-zero, transaction was found) then go check transaction
-				codeByteBuffer.put(OpCode.BZR_DAT.compile(addrResult, calcOffset(codeByteBuffer, labelCheckTradeTxn)));
-				// Stop and wait for next block
-				codeByteBuffer.put(OpCode.STP_IMD.compile());
-
-				/* Check transaction */
-				labelCheckTradeTxn = codeByteBuffer.position();
-
-				// Update our 'last found transaction's timestamp' using 'timestamp' from transaction
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.GET_TIMESTAMP_FROM_TX_IN_A, addrLastTxnTimestamp));
-				// Extract transaction type (message/payment) from transaction and save type in addrTxnType
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.GET_TYPE_FROM_TX_IN_A, addrTxnType));
-				// If transaction type is not MESSAGE type then go look for another transaction
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrTxnType, addrMessageTxnType, calcOffset(codeByteBuffer, labelTradeTxnLoop)));
-
-				/* Check transaction's sender. We're expecting AT creator's trade address for 'trade' message, or AT creator's own address for 'cancel' message. */
-
-				// Extract sender address from transaction into B register
-				codeByteBuffer.put(OpCode.EXT_FUN.compile(FunctionCode.PUT_ADDRESS_FROM_TX_IN_A_INTO_B));
-				// Save B register into data segment starting at addrMessageSender1 (as pointed to by addrMessageSenderPointer)
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrMessageSenderPointer));
-				// Compare each part of message sender's address with AT creator's trade address. If they don't match, check for cancel situation.
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender1, addrCreatorTradeAddress1, calcOffset(codeByteBuffer, labelCheckCancelTxn)));
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender2, addrCreatorTradeAddress2, calcOffset(codeByteBuffer, labelCheckCancelTxn)));
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender3, addrCreatorTradeAddress3, calcOffset(codeByteBuffer, labelCheckCancelTxn)));
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender4, addrCreatorTradeAddress4, calcOffset(codeByteBuffer, labelCheckCancelTxn)));
-				// Message sender's address matches AT creator's trade address so go process 'trade' message
-				codeByteBuffer.put(OpCode.JMP_ADR.compile(labelCheckNonRefundTradeTxn == null ? 0 : labelCheckNonRefundTradeTxn));
-
-				/* Checking message sender for possible cancel message */
-				labelCheckCancelTxn = codeByteBuffer.position();
-
-				// Compare each part of message sender's address with AT creator's address. If they don't match, look for another transaction.
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender1, addrCreatorAddress1, calcOffset(codeByteBuffer, labelNotTradeNorCancelTxn)));
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender2, addrCreatorAddress2, calcOffset(codeByteBuffer, labelNotTradeNorCancelTxn)));
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender3, addrCreatorAddress3, calcOffset(codeByteBuffer, labelNotTradeNorCancelTxn)));
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender4, addrCreatorAddress4, calcOffset(codeByteBuffer, labelNotTradeNorCancelTxn)));
-				// Partner address is AT creator's address, so cancel offer and finish.
-				codeByteBuffer.put(OpCode.SET_VAL.compile(addrMode, AcctMode.CANCELLED.value));
-				// We're finished forever (finishing auto-refunds remaining balance to AT creator)
-				codeByteBuffer.put(OpCode.FIN_IMD.compile());
-
-				/* Not trade nor cancel message */
-				labelNotTradeNorCancelTxn = codeByteBuffer.position();
-
-				// Loop to find another transaction
-				codeByteBuffer.put(OpCode.JMP_ADR.compile(labelTradeTxnLoop == null ? 0 : labelTradeTxnLoop));
-
-				/* Possible switch-to-trade-mode message */
-				labelCheckNonRefundTradeTxn = codeByteBuffer.position();
-
-				// Check 'trade' message we received has expected number of message bytes
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(QortalFunctionCode.GET_MESSAGE_LENGTH_FROM_TX_IN_A.value, addrMessageLength));
-				// If message length matches, branch to info extraction code
-				codeByteBuffer.put(OpCode.BEQ_DAT.compile(addrMessageLength, addrExpectedTradeMessageLength, calcOffset(codeByteBuffer, labelTradeTxnExtract)));
-				// Message length didn't match - go back to finding another 'trade' MESSAGE transaction
-				codeByteBuffer.put(OpCode.JMP_ADR.compile(labelTradeTxnLoop == null ? 0 : labelTradeTxnLoop));
-
-				/* Extracting info from 'trade' MESSAGE transaction */
-				labelTradeTxnExtract = codeByteBuffer.position();
-
-				// Extract message from transaction into B register
-				codeByteBuffer.put(OpCode.EXT_FUN.compile(FunctionCode.PUT_MESSAGE_FROM_TX_IN_A_INTO_B));
-				// Save B register into data segment starting at addrQortalPartnerAddress1 (as pointed to by addrQortalPartnerAddressPointer)
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrQortalPartnerAddressPointer));
-
-				// Extract trade partner's Litecoin public key hash (PKH) from message into B
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(QortalFunctionCode.PUT_PARTIAL_MESSAGE_FROM_TX_IN_A_INTO_B.value, addrTradeMessagePartnerLitecoinPKHOffset));
-				// Store partner's Litecoin PKH (we only really use values from B1-B3)
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrPartnerLitecoinPKHPointer));
-				// Extract AT trade timeout (minutes) (from B4)
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.GET_B4, addrRefundTimeout));
-
-				// Grab next 32 bytes
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(QortalFunctionCode.PUT_PARTIAL_MESSAGE_FROM_TX_IN_A_INTO_B.value, addrTradeMessageHashOfSecretAOffset));
-
-				// Extract hash-of-secret-A (we only really use values from B1-B3)
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrHashOfSecretAPointer));
-				// Extract lockTime-A (from B4)
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.GET_B4, addrLockTimeA));
-
-				// Calculate trade timeout refund 'timestamp' by adding addrRefundTimeout minutes to this transaction's 'timestamp', then save into addrRefundTimestamp
-				codeByteBuffer.put(OpCode.EXT_FUN_RET_DAT_2.compile(FunctionCode.ADD_MINUTES_TO_TIMESTAMP, addrRefundTimestamp, addrLastTxnTimestamp, addrRefundTimeout));
-
-				/* We are in 'trade mode' */
-				codeByteBuffer.put(OpCode.SET_VAL.compile(addrMode, AcctMode.TRADING.value));
-
-				// Set restart position to after this opcode
-				codeByteBuffer.put(OpCode.SET_PCS.compile());
-
-				/* Loop, waiting for trade timeout or 'redeem' MESSAGE from Qortal trade partner */
-
-				// Fetch current block 'timestamp'
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.GET_BLOCK_TIMESTAMP, addrBlockTimestamp));
-				// If we're not past refund 'timestamp' then look for next transaction
-				codeByteBuffer.put(OpCode.BLT_DAT.compile(addrBlockTimestamp, addrRefundTimestamp, calcOffset(codeByteBuffer, labelRedeemTxnLoop)));
-				// We're past refund 'timestamp' so go refund everything back to AT creator
-				codeByteBuffer.put(OpCode.JMP_ADR.compile(labelRefund == null ? 0 : labelRefund));
-
-				/* Transaction processing loop */
-				labelRedeemTxnLoop = codeByteBuffer.position();
-
-				/* Sleep until message arrives */
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(QortalFunctionCode.SLEEP_UNTIL_MESSAGE.value, addrLastTxnTimestamp));
-
-				// Find next transaction to this AT since the last one (if any)
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.PUT_TX_AFTER_TIMESTAMP_INTO_A, addrLastTxnTimestamp));
-				// If no transaction found, A will be zero. If A is zero, set addrComparator to 1, otherwise 0.
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.CHECK_A_IS_ZERO, addrResult));
-				// If addrResult is zero (i.e. A is non-zero, transaction was found) then go check transaction
-				codeByteBuffer.put(OpCode.BZR_DAT.compile(addrResult, calcOffset(codeByteBuffer, labelCheckRedeemTxn)));
-				// Stop and wait for next block
-				codeByteBuffer.put(OpCode.STP_IMD.compile());
-
-				/* Check transaction */
-				labelCheckRedeemTxn = codeByteBuffer.position();
-
-				// Update our 'last found transaction's timestamp' using 'timestamp' from transaction
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.GET_TIMESTAMP_FROM_TX_IN_A, addrLastTxnTimestamp));
-				// Extract transaction type (message/payment) from transaction and save type in addrTxnType
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.GET_TYPE_FROM_TX_IN_A, addrTxnType));
-				// If transaction type is not MESSAGE type then go look for another transaction
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrTxnType, addrMessageTxnType, calcOffset(codeByteBuffer, labelRedeemTxnLoop)));
-
-				/* Check message payload length */
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(QortalFunctionCode.GET_MESSAGE_LENGTH_FROM_TX_IN_A.value, addrMessageLength));
-				// If message length matches, branch to sender checking code
-				codeByteBuffer.put(OpCode.BEQ_DAT.compile(addrMessageLength, addrExpectedRedeemMessageLength, calcOffset(codeByteBuffer, labelCheckRedeemTxnSender)));
-				// Message length didn't match - go back to finding another 'redeem' MESSAGE transaction
-				codeByteBuffer.put(OpCode.JMP_ADR.compile(labelRedeemTxnLoop == null ? 0 : labelRedeemTxnLoop));
-
-				/* Check transaction's sender */
-				labelCheckRedeemTxnSender = codeByteBuffer.position();
-
-				// Extract sender address from transaction into B register
-				codeByteBuffer.put(OpCode.EXT_FUN.compile(FunctionCode.PUT_ADDRESS_FROM_TX_IN_A_INTO_B));
-				// Save B register into data segment starting at addrMessageSender1 (as pointed to by addrMessageSenderPointer)
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrMessageSenderPointer));
-				// Compare each part of transaction's sender's address with expected address. If they don't match, look for another transaction.
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender1, addrQortalPartnerAddress1, calcOffset(codeByteBuffer, labelRedeemTxnLoop)));
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender2, addrQortalPartnerAddress2, calcOffset(codeByteBuffer, labelRedeemTxnLoop)));
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender3, addrQortalPartnerAddress3, calcOffset(codeByteBuffer, labelRedeemTxnLoop)));
-				codeByteBuffer.put(OpCode.BNE_DAT.compile(addrMessageSender4, addrQortalPartnerAddress4, calcOffset(codeByteBuffer, labelRedeemTxnLoop)));
-
-				/* Check 'secret-A' in transaction's message */
-
-				// Extract secret-A from first 32 bytes of message from transaction into B register
-				codeByteBuffer.put(OpCode.EXT_FUN.compile(FunctionCode.PUT_MESSAGE_FROM_TX_IN_A_INTO_B));
-				// Save B register into data segment starting at addrMessageData (as pointed to by addrMessageDataPointer)
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrMessageDataPointer));
-				// Load B register with expected hash result (as pointed to by addrHashOfSecretAPointer)
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.SET_B_IND, addrHashOfSecretAPointer));
-				// Perform HASH160 using source data at addrMessageData. (Location and length specified via addrMessageDataPointer and addrMessageDataLength).
-				// Save the equality result (1 if they match, 0 otherwise) into addrResult.
-				codeByteBuffer.put(OpCode.EXT_FUN_RET_DAT_2.compile(FunctionCode.CHECK_HASH160_WITH_B, addrResult, addrMessageDataPointer, addrMessageDataLength));
-				// If hashes don't match, addrResult will be zero so go find another transaction
-				codeByteBuffer.put(OpCode.BNZ_DAT.compile(addrResult, calcOffset(codeByteBuffer, labelPayout)));
-				codeByteBuffer.put(OpCode.JMP_ADR.compile(labelRedeemTxnLoop == null ? 0 : labelRedeemTxnLoop));
-
-				/* Success! Pay arranged amount to receiving address */
-				labelPayout = codeByteBuffer.position();
-
-				// Extract Qortal receiving address from next 32 bytes of message from transaction into B register
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(QortalFunctionCode.PUT_PARTIAL_MESSAGE_FROM_TX_IN_A_INTO_B.value, addrRedeemMessageReceivingAddressOffset));
-				// Save B register into data segment starting at addrPartnerReceivingAddress (as pointed to by addrPartnerReceivingAddressPointer)
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrPartnerReceivingAddressPointer));
-				// Pay AT's balance to receiving address
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.PAY_TO_ADDRESS_IN_B, addrQortAmount));
-				// Set redeemed mode
-				codeByteBuffer.put(OpCode.SET_VAL.compile(addrMode, AcctMode.REDEEMED.value));
-				// We're finished forever (finishing auto-refunds remaining balance to AT creator)
-				codeByteBuffer.put(OpCode.FIN_IMD.compile());
-
-				// Fall-through to refunding any remaining balance back to AT creator
-
-				/* Refund balance back to AT creator */
-				labelRefund = codeByteBuffer.position();
-
-				// Set refunded mode
-				codeByteBuffer.put(OpCode.SET_VAL.compile(addrMode, AcctMode.REFUNDED.value));
-				// We're finished forever (finishing auto-refunds remaining balance to AT creator)
-				codeByteBuffer.put(OpCode.FIN_IMD.compile());
-			} catch (CompilationException e) {
-				throw new IllegalStateException("Unable to compile LTC-QORT ACCT?", e);
-			}
-		}
-
-		codeByteBuffer.flip();
-
-		byte[] codeBytes = new byte[codeByteBuffer.limit()];
-		codeByteBuffer.get(codeBytes);
-
-		assert Arrays.equals(Crypto.digest(codeBytes), LitecoinACCTv2.CODE_BYTES_HASH)
-			: String.format("BTCACCT.CODE_BYTES_HASH mismatch: expected %s, actual %s", HashCode.fromBytes(CODE_BYTES_HASH), HashCode.fromBytes(Crypto.digest(codeBytes)));
-
-		final short ciyamAtVersion = 2;
-		final short numCallStackPages = 0;
-		final short numUserStackPages = 0;
-		final long minActivationAmount = 0L;
-
-		return MachineState.toCreationBytes(ciyamAtVersion, codeBytes, dataByteBuffer.array(), numCallStackPages, numUserStackPages, minActivationAmount);
-	}
-
-	/**
-	 * Returns CrossChainTradeData with useful info extracted from AT.
-	 */
-	@Override
-	public CrossChainTradeData populateTradeData(Repository repository, ATData atData) throws DataException {
-		ATStateData atStateData = repository.getATRepository().getLatestATState(atData.getATAddress());
-		return populateTradeData(repository, atData.getCreatorPublicKey(), atData.getCreation(), atStateData);
-	}
-
-	/**
-	 * Returns CrossChainTradeData with useful info extracted from AT.
-	 */
-	@Override
-	public CrossChainTradeData populateTradeData(Repository repository, ATStateData atStateData) throws DataException {
-		ATData atData = repository.getATRepository().fromATAddress(atStateData.getATAddress());
-		return populateTradeData(repository, atData.getCreatorPublicKey(), atData.getCreation(), atStateData);
-	}
-
-	/**
-	 * Returns CrossChainTradeData with useful info extracted from AT.
-	 */
-	public CrossChainTradeData populateTradeData(Repository repository, byte[] creatorPublicKey, long creationTimestamp, ATStateData atStateData) throws DataException {
-		byte[] addressBytes = new byte[25]; // for general use
-		String atAddress = atStateData.getATAddress();
-
-		CrossChainTradeData tradeData = new CrossChainTradeData();
-
-		tradeData.foreignBlockchain = SupportedBlockchain.LITECOIN.name();
-		tradeData.acctName = NAME;
-
-		tradeData.qortalAtAddress = atAddress;
-		tradeData.qortalCreator = Crypto.toAddress(creatorPublicKey);
-		tradeData.creationTimestamp = creationTimestamp;
-
-		Account atAccount = new Account(repository, atAddress);
-		tradeData.qortBalance = atAccount.getConfirmedBalance(Asset.QORT);
-
-		byte[] stateData = atStateData.getStateData();
-		ByteBuffer dataByteBuffer = ByteBuffer.wrap(stateData);
-		dataByteBuffer.position(MachineState.HEADER_LENGTH);
-
-		/* Constants */
-
-		// Skip creator's trade address
-		dataByteBuffer.get(addressBytes);
-		tradeData.qortalCreatorTradeAddress = Base58.encode(addressBytes);
-		dataByteBuffer.position(dataByteBuffer.position() + 32 - addressBytes.length);
-
-		// Creator's Litecoin/foreign public key hash
-		tradeData.creatorForeignPKH = new byte[20];
-		dataByteBuffer.get(tradeData.creatorForeignPKH);
-		dataByteBuffer.position(dataByteBuffer.position() + 32 - tradeData.creatorForeignPKH.length); // skip to 32 bytes
-
-		// We don't use secret-B
-		tradeData.hashOfSecretB = null;
-
-		// Redeem payout
-		tradeData.qortAmount = dataByteBuffer.getLong();
-
-		// Expected LTC amount
-		tradeData.expectedForeignAmount = dataByteBuffer.getLong();
-
-		// Trade timeout
-		tradeData.tradeTimeout = (int) dataByteBuffer.getLong();
-
-		// Skip MESSAGE transaction type
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip expected 'trade' message length
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip expected 'redeem' message length
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip pointer to creator's address
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip pointer to partner's Qortal trade address
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip pointer to message sender
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip 'trade' message data offset for partner's Litecoin PKH
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip pointer to partner's Litecoin PKH
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip 'trade' message data offset for hash-of-secret-A
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip pointer to hash-of-secret-A
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip 'redeem' message data offset for partner's Qortal receiving address
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip pointer to message data
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip message data length
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip pointer to partner's receiving address
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		/* End of constants / begin variables */
-
-		// Skip AT creator's address
-		dataByteBuffer.position(dataByteBuffer.position() + 8 * 4);
-
-		// Partner's trade address (if present)
-		dataByteBuffer.get(addressBytes);
-		String qortalRecipient = Base58.encode(addressBytes);
-		dataByteBuffer.position(dataByteBuffer.position() + 32 - addressBytes.length);
-
-		// Potential lockTimeA (if in trade mode)
-		int lockTimeA = (int) dataByteBuffer.getLong();
-
-		// AT refund timeout (probably only useful for debugging)
-		int refundTimeout = (int) dataByteBuffer.getLong();
-
-		// Trade-mode refund timestamp (AT 'timestamp' converted to Qortal block height)
-		long tradeRefundTimestamp = dataByteBuffer.getLong();
-
-		// Skip last transaction timestamp
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip block timestamp
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip transaction type
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip temporary result
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip temporary message sender
-		dataByteBuffer.position(dataByteBuffer.position() + 8 * 4);
-
-		// Skip message length
-		dataByteBuffer.position(dataByteBuffer.position() + 8);
-
-		// Skip temporary message data
-		dataByteBuffer.position(dataByteBuffer.position() + 8 * 4);
-
-		// Potential hash160 of secret A
-		byte[] hashOfSecretA = new byte[20];
-		dataByteBuffer.get(hashOfSecretA);
-		dataByteBuffer.position(dataByteBuffer.position() + 32 - hashOfSecretA.length); // skip to 32 bytes
-
-		// Potential partner's Litecoin PKH
-		byte[] partnerLitecoinPKH = new byte[20];
-		dataByteBuffer.get(partnerLitecoinPKH);
-		dataByteBuffer.position(dataByteBuffer.position() + 32 - partnerLitecoinPKH.length); // skip to 32 bytes
-
-		// Partner's receiving address (if present)
-		byte[] partnerReceivingAddress = new byte[25];
-		dataByteBuffer.get(partnerReceivingAddress);
-		dataByteBuffer.position(dataByteBuffer.position() + 32 - partnerReceivingAddress.length); // skip to 32 bytes
-
-		// Trade AT's 'mode'
-		long modeValue = dataByteBuffer.getLong();
-		AcctMode mode = AcctMode.valueOf((int) (modeValue & 0xffL));
-
-		/* End of variables */
-
-		if (mode != null && mode != AcctMode.OFFERING) {
-			tradeData.mode = mode;
-			tradeData.refundTimeout = refundTimeout;
-			tradeData.tradeRefundHeight = new Timestamp(tradeRefundTimestamp).blockHeight;
-			tradeData.qortalPartnerAddress = qortalRecipient;
-			tradeData.hashOfSecretA = hashOfSecretA;
-			tradeData.partnerForeignPKH = partnerLitecoinPKH;
-			tradeData.lockTimeA = lockTimeA;
-
-			if (mode == AcctMode.REDEEMED)
-				tradeData.qortalPartnerReceivingAddress = Base58.encode(partnerReceivingAddress);
-		} else {
-			tradeData.mode = AcctMode.OFFERING;
-		}
-
-		tradeData.duplicateDeprecated();
-
-		return tradeData;
-	}
-
-	/** Returns 'offer' MESSAGE payload for trade partner to send to AT creator's trade address. */
-	public static byte[] buildOfferMessage(byte[] partnerBitcoinPKH, byte[] hashOfSecretA, int lockTimeA) {
-		byte[] lockTimeABytes = BitTwiddling.toBEByteArray((long) lockTimeA);
-		return Bytes.concat(partnerBitcoinPKH, hashOfSecretA, lockTimeABytes);
-	}
-
-	/** Returns info extracted from 'offer' MESSAGE payload sent by trade partner to AT creator's trade address, or null if not valid. */
-	public static OfferMessageData extractOfferMessageData(byte[] messageData) {
-		if (messageData == null || messageData.length != OFFER_MESSAGE_LENGTH)
-			return null;
-
-		OfferMessageData offerMessageData = new OfferMessageData();
-		offerMessageData.partnerLitecoinPKH = Arrays.copyOfRange(messageData, 0, 20);
-		offerMessageData.hashOfSecretA = Arrays.copyOfRange(messageData, 20, 40);
-		offerMessageData.lockTimeA = BitTwiddling.longFromBEBytes(messageData, 40);
-
-		return offerMessageData;
-	}
-
-	/** Returns 'trade' MESSAGE payload for AT creator to send to AT. */
-	public static byte[] buildTradeMessage(String partnerQortalTradeAddress, byte[] partnerBitcoinPKH, byte[] hashOfSecretA, int lockTimeA, int refundTimeout) {
-		byte[] data = new byte[TRADE_MESSAGE_LENGTH];
-		byte[] partnerQortalAddressBytes = Base58.decode(partnerQortalTradeAddress);
-		byte[] lockTimeABytes = BitTwiddling.toBEByteArray((long) lockTimeA);
-		byte[] refundTimeoutBytes = BitTwiddling.toBEByteArray((long) refundTimeout);
-
-		System.arraycopy(partnerQortalAddressBytes, 0, data, 0, partnerQortalAddressBytes.length);
-		System.arraycopy(partnerBitcoinPKH, 0, data, 32, partnerBitcoinPKH.length);
-		System.arraycopy(refundTimeoutBytes, 0, data, 56, refundTimeoutBytes.length);
-		System.arraycopy(hashOfSecretA, 0, data, 64, hashOfSecretA.length);
-		System.arraycopy(lockTimeABytes, 0, data, 88, lockTimeABytes.length);
-
-		return data;
-	}
-
-	/** Returns 'cancel' MESSAGE payload for AT creator to cancel trade AT. */
-	@Override
-	public byte[] buildCancelMessage(String creatorQortalAddress) {
-		byte[] data = new byte[CANCEL_MESSAGE_LENGTH];
-		byte[] creatorQortalAddressBytes = Base58.decode(creatorQortalAddress);
-
-		System.arraycopy(creatorQortalAddressBytes, 0, data, 0, creatorQortalAddressBytes.length);
-
-		return data;
-	}
-
-	/** Returns 'redeem' MESSAGE payload for trade partner to send to AT. */
-	public static byte[] buildRedeemMessage(byte[] secretA, String qortalReceivingAddress) {
-		byte[] data = new byte[REDEEM_MESSAGE_LENGTH];
-		byte[] qortalReceivingAddressBytes = Base58.decode(qortalReceivingAddress);
-
-		System.arraycopy(secretA, 0, data, 0, secretA.length);
-		System.arraycopy(qortalReceivingAddressBytes, 0, data, 32, qortalReceivingAddressBytes.length);
-
-		return data;
-	}
-
-	/** Returns refund timeout (minutes) based on trade partner's 'offer' MESSAGE timestamp and P2SH-A locktime. */
-	public static int calcRefundTimeout(long offerMessageTimestamp, int lockTimeA) {
-		// refund should be triggered halfway between offerMessageTimestamp and lockTimeA
-		return (int) ((lockTimeA - (offerMessageTimestamp / 1000L)) / 2L / 60L);
-	}
-
-	@Override
-	public byte[] findSecretA(Repository repository, CrossChainTradeData crossChainTradeData) throws DataException {
-		String atAddress = crossChainTradeData.qortalAtAddress;
-		String redeemerAddress = crossChainTradeData.qortalPartnerAddress;
-
-		// We don't have partner's public key so we check every message to AT
-		List<MessageTransactionData> messageTransactionsData = repository.getMessageRepository().getMessagesByParticipants(null, atAddress, null, null, null);
-		if (messageTransactionsData == null)
-			return null;
-
-		// Find 'redeem' message
-		for (MessageTransactionData messageTransactionData : messageTransactionsData) {
-			// Check message payload type/encryption
-			if (messageTransactionData.isText() || messageTransactionData.isEncrypted())
-				continue;
-
-			// Check message payload size
-			byte[] messageData = messageTransactionData.getData();
-			if (messageData.length != REDEEM_MESSAGE_LENGTH)
-				// Wrong payload length
-				continue;
-
-			// Check sender
-			if (!Crypto.toAddress(messageTransactionData.getSenderPublicKey()).equals(redeemerAddress))
-				// Wrong sender;
-				continue;
-
-			// Extract secretA
-			byte[] secretA = new byte[32];
-			System.arraycopy(messageData, 0, secretA, 0, secretA.length);
-
-			byte[] hashOfSecretA = Crypto.hash160(secretA);
-			if (!Arrays.equals(hashOfSecretA, crossChainTradeData.hashOfSecretA))
-				continue;
-
-			return secretA;
-		}
-
-		return null;
-	}
-
-}

src/main/java/org/qortal/crosschain/PirateChain.java

@@ -0,0 +1,659 @@
+package org.qortal.crosschain;
+
+import cash.z.wallet.sdk.rpc.CompactFormats;
+import com.google.common.hash.HashCode;
+import com.rust.litewalletjni.LiteWalletJni;
+import org.bitcoinj.core.*;
+import org.bitcoinj.crypto.ChildNumber;
+import org.bitcoinj.crypto.DeterministicKey;
+import org.bitcoinj.script.Script;
+import org.bitcoinj.script.ScriptBuilder;
+import org.bitcoinj.wallet.DeterministicKeyChain;
+import org.bitcoinj.wallet.Wallet;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.libdohj.params.LitecoinRegTestParams;
+import org.libdohj.params.LitecoinTestNet3Params;
+import org.libdohj.params.PirateChainMainNetParams;
+import org.qortal.api.model.crosschain.PirateChainSendRequest;
+import org.qortal.controller.PirateChainWalletController;
+import org.qortal.crosschain.PirateLightClient.Server;
+import org.qortal.crosschain.PirateLightClient.Server.ConnectionType;
+import org.qortal.crypto.Crypto;
+import org.qortal.settings.Settings;
+import org.qortal.transform.TransformationException;
+import org.qortal.utils.BitTwiddling;
+
+import java.nio.ByteBuffer;
+import java.util.*;
+
+public class PirateChain extends Bitcoiny {
+
+	public static final String CURRENCY_CODE = "ARRR";
+
+	private static final Coin DEFAULT_FEE_PER_KB = Coin.valueOf(10000); // 0.0001 ARRR per 1000 bytes
+
+	private static final long MINIMUM_ORDER_AMOUNT = 10000; // 0.0001 ARRR minimum order, to avoid dust errors // TODO: increase this
+
+	// Temporary values until a dynamic fee system is written.
+	private static final long MAINNET_FEE = 10000L; // 0.0001 ARRR
+	private static final long NON_MAINNET_FEE = 10000L; // 0.0001 ARRR
+
+	private static final Map<ConnectionType, Integer> DEFAULT_LITEWALLET_PORTS = new EnumMap<>(ConnectionType.class);
+	static {
+		DEFAULT_LITEWALLET_PORTS.put(ConnectionType.TCP, 9067);
+		DEFAULT_LITEWALLET_PORTS.put(ConnectionType.SSL, 443);
+	}
+
+	public enum PirateChainNet {
+		MAIN {
+			@Override
+			public NetworkParameters getParams() {
+				return PirateChainMainNetParams.get();
+			}
+
+			@Override
+			public Collection<Server> getServers() {
+				return Arrays.asList(
+						// Servers chosen on NO BASIS WHATSOEVER from various sources!
+						new Server("arrrlightd.qortal.online", ConnectionType.SSL, 443),
+						new Server("arrrlightd1.qortal.online", ConnectionType.SSL, 443),
+						new Server("arrrlightd2.qortal.online", ConnectionType.SSL, 443),
+						new Server("lightd.pirate.black", ConnectionType.SSL, 443));
+			}
+
+			@Override
+			public String getGenesisHash() {
+				return "027e3758c3a65b12aa1046462b486d0a63bfa1beae327897f56c5cfb7daaae71";
+			}
+
+			@Override
+			public long getP2shFee(Long timestamp) {
+				// TODO: This will need to be replaced with something better in the near future!
+				return MAINNET_FEE;
+			}
+		},
+		TEST3 {
+			@Override
+			public NetworkParameters getParams() {
+				return LitecoinTestNet3Params.get();
+			}
+
+			@Override
+			public Collection<Server> getServers() {
+				return Arrays.asList();
+			}
+
+			@Override
+			public String getGenesisHash() {
+				return "4966625a4b2851d9fdee139e56211a0d88575f59ed816ff5e6a63deb4e3e29a0";
+			}
+
+			@Override
+			public long getP2shFee(Long timestamp) {
+				return NON_MAINNET_FEE;
+			}
+		},
+		REGTEST {
+			@Override
+			public NetworkParameters getParams() {
+				return LitecoinRegTestParams.get();
+			}
+
+			@Override
+			public Collection<Server> getServers() {
+				return Arrays.asList(
+						new Server("localhost", ConnectionType.TCP, 9067),
+						new Server("localhost", ConnectionType.SSL, 443));
+			}
+
+			@Override
+			public String getGenesisHash() {
+				// This is unique to each regtest instance
+				return null;
+			}
+
+			@Override
+			public long getP2shFee(Long timestamp) {
+				return NON_MAINNET_FEE;
+			}
+		};
+
+		public abstract NetworkParameters getParams();
+		public abstract Collection<Server> getServers();
+		public abstract String getGenesisHash();
+		public abstract long getP2shFee(Long timestamp) throws ForeignBlockchainException;
+	}
+
+	private static PirateChain instance;
+
+	private final PirateChainNet pirateChainNet;
+
+	// Constructors and instance
+
+	private PirateChain(PirateChainNet pirateChainNet, BitcoinyBlockchainProvider blockchain, Context bitcoinjContext, String currencyCode) {
+		super(blockchain, bitcoinjContext, currencyCode);
+		this.pirateChainNet = pirateChainNet;
+
+		LOGGER.info(() -> String.format("Starting Pirate Chain support using %s", this.pirateChainNet.name()));
+	}
+
+	public static synchronized PirateChain getInstance() {
+		if (instance == null) {
+			PirateChainNet pirateChainNet = Settings.getInstance().getPirateChainNet();
+
+			BitcoinyBlockchainProvider pirateLightClient = new PirateLightClient("PirateChain-" + pirateChainNet.name(), pirateChainNet.getGenesisHash(), pirateChainNet.getServers(), DEFAULT_LITEWALLET_PORTS);
+			Context bitcoinjContext = new Context(pirateChainNet.getParams());
+
+			instance = new PirateChain(pirateChainNet, pirateLightClient, bitcoinjContext, CURRENCY_CODE);
+
+			pirateLightClient.setBlockchain(instance);
+		}
+
+		return instance;
+	}
+
+	// Getters & setters
+
+	public static synchronized void resetForTesting() {
+		instance = null;
+	}
+
+	// Actual useful methods for use by other classes
+
+	/** Default Litecoin fee is lower than Bitcoin: only 10sats/byte. */
+	@Override
+	public Coin getFeePerKb() {
+		return DEFAULT_FEE_PER_KB;
+	}
+
+	@Override
+	public long getMinimumOrderAmount() {
+		return MINIMUM_ORDER_AMOUNT;
+	}
+
+	/**
+	 * Returns estimated LTC fee, in sats per 1000bytes, optionally for historic timestamp.
+	 * 
+	 * @param timestamp optional milliseconds since epoch, or null for 'now'
+	 * @return sats per 1000bytes, or throws ForeignBlockchainException if something went wrong
+	 */
+	@Override
+	public long getP2shFee(Long timestamp) throws ForeignBlockchainException {
+		return this.pirateChainNet.getP2shFee(timestamp);
+	}
+
+	/**
+	 * Returns confirmed balance, based on passed payment script.
+	 * <p>
+	 * @return confirmed balance, or zero if balance unknown
+	 * @throws ForeignBlockchainException if there was an error
+	 */
+	public long getConfirmedBalance(String base58Address) throws ForeignBlockchainException {
+		return this.blockchainProvider.getConfirmedAddressBalance(base58Address);
+	}
+
+	/**
+	 * Returns median timestamp from latest 11 blocks, in seconds.
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	@Override
+	public int getMedianBlockTime() throws ForeignBlockchainException {
+		int height = this.blockchainProvider.getCurrentHeight();
+
+		// Grab latest 11 blocks
+		List<Long> blockTimestamps = this.blockchainProvider.getBlockTimestamps(height - 11, 11);
+		if (blockTimestamps.size() < 11)
+			throw new ForeignBlockchainException("Not enough blocks to determine median block time");
+
+		// Descending order
+		blockTimestamps.sort((a, b) -> Long.compare(b, a));
+
+		// Pick median
+		return Math.toIntExact(blockTimestamps.get(5));
+	}
+
+	/**
+	 * Returns list of compact blocks
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	public List<CompactFormats.CompactBlock> getCompactBlocks(int startHeight, int count) throws ForeignBlockchainException {
+		return this.blockchainProvider.getCompactBlocks(startHeight, count);
+	}
+
+
+	@Override
+	public boolean isValidAddress(String address) {
+		// Start with some simple checks
+		if (address == null || !address.toLowerCase().startsWith("zs") || address.length() != 78) {
+			return false;
+		}
+
+		// Now try Bech32 decoding the address (which includes checksum verification)
+		try {
+			Bech32.Bech32Data decoded = Bech32.decode(address);
+			return (decoded != null && Objects.equals("zs", decoded.hrp));
+		}
+		catch (AddressFormatException e) {
+			// Invalid address, checksum failed, etc
+			return false;
+		}
+	}
+
+	@Override
+	public boolean isValidWalletKey(String walletKey) {
+		// For Pirate Chain, we only care that the key is a random string
+		// 32 characters in length, as it is used as entropy for the seed.
+		return walletKey != null && Base58.decode(walletKey).length == 32;
+	}
+
+	/** Returns 't3' prefixed P2SH address using passed redeem script. */
+	public String deriveP2shAddress(byte[] redeemScriptBytes) {
+		Context.propagate(bitcoinjContext);
+		byte[] redeemScriptHash = Crypto.hash160(redeemScriptBytes);
+		return LegacyZcashAddress.fromScriptHash(this.params, redeemScriptHash).toString();
+	}
+
+	/** Returns 'b' prefixed P2SH address using passed redeem script. */
+	public String deriveP2shAddressBPrefix(byte[] redeemScriptBytes) {
+		Context.propagate(bitcoinjContext);
+		byte[] redeemScriptHash = Crypto.hash160(redeemScriptBytes);
+		return LegacyAddress.fromScriptHash(this.params, redeemScriptHash).toString();
+	}
+
+	public Long getWalletBalance(String entropy58) throws ForeignBlockchainException {
+		synchronized (this) {
+			PirateChainWalletController walletController = PirateChainWalletController.getInstance();
+			walletController.initWithEntropy58(entropy58);
+			walletController.ensureInitialized();
+			walletController.ensureSynchronized();
+			walletController.ensureNotNullSeed();
+
+			// Get balance
+			String response = LiteWalletJni.execute("balance", "");
+			JSONObject json = new JSONObject(response);
+			if (json.has("zbalance")) {
+				return json.getLong("zbalance");
+			}
+
+			throw new ForeignBlockchainException("Unable to determine balance");
+		}
+	}
+
+	public List<SimpleTransaction> getWalletTransactions(String entropy58) throws ForeignBlockchainException {
+		synchronized (this) {
+			PirateChainWalletController walletController = PirateChainWalletController.getInstance();
+			walletController.initWithEntropy58(entropy58);
+			walletController.ensureInitialized();
+			walletController.ensureSynchronized();
+			walletController.ensureNotNullSeed();
+
+			List<SimpleTransaction> transactions = new ArrayList<>();
+
+			// Get transactions list
+			String response = LiteWalletJni.execute("list", "");
+			JSONArray transactionsJson = new JSONArray(response);
+			if (transactionsJson != null) {
+				for (int i = 0; i < transactionsJson.length(); i++) {
+					JSONObject transactionJson = transactionsJson.getJSONObject(i);
+
+					if (transactionJson.has("txid")) {
+						String txId = transactionJson.getString("txid");
+						Long timestamp = transactionJson.getLong("datetime");
+						Long amount = transactionJson.getLong("amount");
+						Long fee = transactionJson.getLong("fee");
+						String memo = null;
+
+						if (transactionJson.has("incoming_metadata")) {
+							JSONArray incomingMetadatas = transactionJson.getJSONArray("incoming_metadata");
+							if (incomingMetadatas != null) {
+								for (int j = 0; j < incomingMetadatas.length(); j++) {
+									JSONObject incomingMetadata = incomingMetadatas.getJSONObject(j);
+									if (incomingMetadata.has("value")) {
+										//String address = incomingMetadata.getString("address");
+										Long value = incomingMetadata.getLong("value");
+										amount = value; // TODO: figure out how to parse transactions with multiple incomingMetadata entries
+									}
+
+									if (incomingMetadata.has("memo") && !incomingMetadata.isNull("memo")) {
+										memo = incomingMetadata.getString("memo");
+									}
+								}
+							}
+						}
+
+						if (transactionJson.has("outgoing_metadata")) {
+							JSONArray outgoingMetadatas = transactionJson.getJSONArray("outgoing_metadata");
+							for (int j = 0; j < outgoingMetadatas.length(); j++) {
+								JSONObject outgoingMetadata = outgoingMetadatas.getJSONObject(j);
+
+								if (outgoingMetadata.has("memo") && !outgoingMetadata.isNull("memo")) {
+									memo = outgoingMetadata.getString("memo");
+								}
+							}
+						}
+
+						long timestampMillis = Math.toIntExact(timestamp) * 1000L;
+						SimpleTransaction transaction = new SimpleTransaction(txId, timestampMillis, amount, fee, null, null, memo);
+						transactions.add(transaction);
+					}
+				}
+			}
+
+			return transactions;
+		}
+	}
+
+	public String getWalletAddress(String entropy58) throws ForeignBlockchainException {
+		synchronized (this) {
+			PirateChainWalletController walletController = PirateChainWalletController.getInstance();
+			walletController.initWithEntropy58(entropy58);
+			walletController.ensureInitialized();
+			walletController.ensureNotNullSeed();
+
+			return walletController.getCurrentWallet().getWalletAddress();
+		}
+	}
+
+	public String getUnusedReceiveAddress(String key58) throws ForeignBlockchainException {
+		// For now, return the main wallet address
+		// FUTURE: generate an unused one
+		return this.getWalletAddress(key58);
+	}
+
+	public String sendCoins(PirateChainSendRequest pirateChainSendRequest) throws ForeignBlockchainException {
+		PirateChainWalletController walletController = PirateChainWalletController.getInstance();
+		walletController.initWithEntropy58(pirateChainSendRequest.entropy58);
+		walletController.ensureInitialized();
+		walletController.ensureSynchronized();
+		walletController.ensureNotNullSeed();
+
+		// Unlock wallet
+		walletController.getCurrentWallet().unlock();
+
+		// Build spend
+		JSONObject txn = new JSONObject();
+		txn.put("input", walletController.getCurrentWallet().getWalletAddress());
+		txn.put("fee", MAINNET_FEE);
+
+		JSONObject output = new JSONObject();
+		output.put("address", pirateChainSendRequest.receivingAddress);
+		output.put("amount", pirateChainSendRequest.arrrAmount);
+		output.put("memo", pirateChainSendRequest.memo);
+
+		JSONArray outputs = new JSONArray();
+		outputs.put(output);
+		txn.put("output", outputs);
+
+		String txnString = txn.toString();
+
+		// Send the coins
+		String response = LiteWalletJni.execute("send", txnString);
+		JSONObject json = new JSONObject(response);
+		try {
+			if (json.has("txid")) { // Success
+				return json.getString("txid");
+			}
+			else if (json.has("error")) {
+				String error = json.getString("error");
+				throw new ForeignBlockchainException(error);
+			}
+
+		} catch (JSONException e) {
+			throw new ForeignBlockchainException(e.getMessage());
+		}
+
+		throw new ForeignBlockchainException("Something went wrong");
+	}
+
+	public String fundP2SH(String entropy58, String receivingAddress, long amount,
+						   String redeemScript58) throws ForeignBlockchainException {
+
+		PirateChainWalletController walletController = PirateChainWalletController.getInstance();
+		walletController.initWithEntropy58(entropy58);
+		walletController.ensureInitialized();
+		walletController.ensureSynchronized();
+		walletController.ensureNotNullSeed();
+
+		// Unlock wallet
+		walletController.getCurrentWallet().unlock();
+
+		// Build spend
+		JSONObject txn = new JSONObject();
+		txn.put("input", walletController.getCurrentWallet().getWalletAddress());
+		txn.put("fee", MAINNET_FEE);
+
+		JSONObject output = new JSONObject();
+		output.put("address", receivingAddress);
+		output.put("amount", amount);
+		//output.put("memo", memo);
+
+		JSONArray outputs = new JSONArray();
+		outputs.put(output);
+		txn.put("output", outputs);
+		txn.put("script", redeemScript58);
+
+		String txnString = txn.toString();
+
+		// Send the coins
+		String response = LiteWalletJni.execute("sendp2sh", txnString);
+		JSONObject json = new JSONObject(response);
+		try {
+			if (json.has("txid")) { // Success
+				return json.getString("txid");
+			}
+			else if (json.has("error")) {
+				String error = json.getString("error");
+				throw new ForeignBlockchainException(error);
+			}
+
+		} catch (JSONException e) {
+			throw new ForeignBlockchainException(e.getMessage());
+		}
+
+		throw new ForeignBlockchainException("Something went wrong");
+	}
+
+	public String redeemP2sh(String p2shAddress, String receivingAddress, long amount, String redeemScript58,
+							 String fundingTxid58, String secret58, String privateKey58) throws ForeignBlockchainException {
+
+		// Use null seed wallet since we may not have the entropy bytes for a real wallet's seed
+		PirateChainWalletController walletController = PirateChainWalletController.getInstance();
+		walletController.initNullSeedWallet();
+		walletController.ensureInitialized();
+
+		walletController.getCurrentWallet().unlock();
+
+		// Build spend
+		JSONObject txn = new JSONObject();
+		txn.put("input", p2shAddress);
+		txn.put("fee", MAINNET_FEE);
+
+		JSONObject output = new JSONObject();
+		output.put("address", receivingAddress);
+		output.put("amount", amount);
+		// output.put("memo", ""); // Maybe useful in future to include trade details?
+
+		JSONArray outputs = new JSONArray();
+		outputs.put(output);
+		txn.put("output", outputs);
+
+		txn.put("script", redeemScript58);
+		txn.put("txid", fundingTxid58);
+		txn.put("locktime", 0); // Must be 0 when redeeming
+		txn.put("secret", secret58);
+		txn.put("privkey", privateKey58);
+
+		String txnString = txn.toString();
+
+		// Redeem the P2SH
+		String response = LiteWalletJni.execute("redeemp2sh", txnString);
+		JSONObject json = new JSONObject(response);
+		try {
+			if (json.has("txid")) { // Success
+				return json.getString("txid");
+			}
+			else if (json.has("error")) {
+				String error = json.getString("error");
+				throw new ForeignBlockchainException(error);
+			}
+
+		} catch (JSONException e) {
+			throw new ForeignBlockchainException(e.getMessage());
+		}
+
+		throw new ForeignBlockchainException("Something went wrong");
+	}
+
+	public String refundP2sh(String p2shAddress, String receivingAddress, long amount, String redeemScript58,
+							 String fundingTxid58, int lockTime, String privateKey58) throws ForeignBlockchainException {
+
+		// Use null seed wallet since we may not have the entropy bytes for a real wallet's seed
+		PirateChainWalletController walletController = PirateChainWalletController.getInstance();
+		walletController.initNullSeedWallet();
+		walletController.ensureInitialized();
+
+		walletController.getCurrentWallet().unlock();
+
+		// Build spend
+		JSONObject txn = new JSONObject();
+		txn.put("input", p2shAddress);
+		txn.put("fee", MAINNET_FEE);
+
+		JSONObject output = new JSONObject();
+		output.put("address", receivingAddress);
+		output.put("amount", amount);
+		// output.put("memo", ""); // Maybe useful in future to include trade details?
+
+		JSONArray outputs = new JSONArray();
+		outputs.put(output);
+		txn.put("output", outputs);
+
+		txn.put("script", redeemScript58);
+		txn.put("txid", fundingTxid58);
+		txn.put("locktime", lockTime);
+		txn.put("secret", ""); // Must be blank when refunding
+		txn.put("privkey", privateKey58);
+
+		String txnString = txn.toString();
+
+		// Redeem the P2SH
+		String response = LiteWalletJni.execute("redeemp2sh", txnString);
+		JSONObject json = new JSONObject(response);
+		try {
+			if (json.has("txid")) { // Success
+				return json.getString("txid");
+			}
+			else if (json.has("error")) {
+				String error = json.getString("error");
+				throw new ForeignBlockchainException(error);
+			}
+
+		} catch (JSONException e) {
+			throw new ForeignBlockchainException(e.getMessage());
+		}
+
+		throw new ForeignBlockchainException("Something went wrong");
+	}
+
+	public String getSyncStatus(String entropy58) throws ForeignBlockchainException {
+		synchronized (this) {
+			PirateChainWalletController walletController = PirateChainWalletController.getInstance();
+			walletController.initWithEntropy58(entropy58);
+
+			return walletController.getSyncStatus();
+		}
+	}
+
+	public static BitcoinyTransaction deserializeRawTransaction(String rawTransactionHex) throws TransformationException {
+		byte[] rawTransactionData = HashCode.fromString(rawTransactionHex).asBytes();
+		ByteBuffer byteBuffer = ByteBuffer.wrap(rawTransactionData);
+
+		// Header
+		int header = BitTwiddling.readU32(byteBuffer);
+		boolean overwintered = ((header >> 31 & 0xff) == 255);
+		int version = header & 0x7FFFFFFF;
+
+		// Version group ID
+		int versionGroupId = 0;
+		if (overwintered) {
+			versionGroupId = BitTwiddling.readU32(byteBuffer);
+		}
+
+		boolean isOverwinterV3 = overwintered && versionGroupId == 0x03C48270 && version == 3;
+		boolean isSaplingV4 = overwintered && versionGroupId == 0x892F2085 && version == 4;
+		if (overwintered && !(isOverwinterV3 || isSaplingV4)) {
+			throw new TransformationException("Unknown transaction format");
+		}
+
+		// Inputs
+		List<BitcoinyTransaction.Input> inputs = new ArrayList<>();
+		int vinCount = BitTwiddling.readU8(byteBuffer);
+		for (int i=0; i<vinCount; i++) {
+			// Outpoint hash
+			byte[] outpointHashBytes = new byte[32];
+			byteBuffer.get(outpointHashBytes);
+			String outpointHash = HashCode.fromBytes(outpointHashBytes).toString();
+
+			// vout
+			int vout = BitTwiddling.readU32(byteBuffer);
+
+			// scriptSig
+			int scriptSigLength = BitTwiddling.readU8(byteBuffer);
+			byte[] scriptSigBytes = new byte[scriptSigLength];
+			byteBuffer.get(scriptSigBytes);
+			String scriptSig = HashCode.fromBytes(scriptSigBytes).toString();
+
+			int sequence = BitTwiddling.readU32(byteBuffer);
+
+			BitcoinyTransaction.Input input = new BitcoinyTransaction.Input(scriptSig, sequence, outpointHash, vout);
+			inputs.add(input);
+		}
+
+		// Outputs
+		List<BitcoinyTransaction.Output> outputs = new ArrayList<>();
+		int voutCount = BitTwiddling.readU8(byteBuffer);
+		for (int i=0; i<voutCount; i++) {
+			// Amount
+			byte[] amountBytes = new byte[8];
+			byteBuffer.get(amountBytes);
+			long amount = BitTwiddling.longFromLEBytes(amountBytes, 0);
+
+			// Script pubkey
+			int scriptPubkeySize = BitTwiddling.readU8(byteBuffer);
+			byte[] scriptPubkeyBytes = new byte[scriptPubkeySize];
+			byteBuffer.get(scriptPubkeyBytes);
+			String scriptPubKey = HashCode.fromBytes(scriptPubkeyBytes).toString();
+
+			outputs.add(new BitcoinyTransaction.Output(scriptPubKey, amount, null));
+		}
+
+		// Locktime
+		byte[] locktimeBytes = new byte[4];
+		byteBuffer.get(locktimeBytes);
+		int locktime = BitTwiddling.intFromLEBytes(locktimeBytes, 0);
+
+		// Expiry height
+		int expiryHeight = 0;
+		if (isOverwinterV3 || isSaplingV4) {
+			byte[] expiryHeightBytes = new byte[4];
+			byteBuffer.get(expiryHeightBytes);
+			expiryHeight = BitTwiddling.intFromLEBytes(expiryHeightBytes, 0);
+		}
+
+		String txHash = null; // Not present in raw transaction data
+		int size = 0; // Not present in raw transaction data
+		Integer timestamp = null; // Not present in raw transaction data
+
+		// Note: this is incomplete, as sapling spend info is not yet parsed. We don't need it for our
+		// current trade bot implementation, but it could be added in the future, for completeness.
+		// See link below for reference:
+		// https://github.com/PirateNetwork/librustzcash/blob/2981c4d2860f7cd73282fed885daac0323ff0280/zcash_primitives/src/transaction/mod.rs#L197
+
+		return new BitcoinyTransaction(txHash, size, locktime, timestamp, inputs, outputs);
+	}
+
+}

src/main/java/org/qortal/crosschain/PirateChainACCTv3.java

@@ -2,8 +2,6 @@ package org.qortal.crosschain;
 
 import com.google.common.hash.HashCode;
 import com.google.common.primitives.Bytes;
-import org.apache.logging.log4j.LogManager;
-import org.apache.logging.log4j.Logger;
 import org.ciyam.at.*;
 import org.qortal.account.Account;
 import org.qortal.asset.Asset;
@@ -29,7 +27,7 @@ import static org.ciyam.at.OpCode.calcOffset;
  * 
  * <p>
  * <ul>
- * <li>Bob generates Dogecoin & Qortal 'trade' keys
+ * <li>Bob generates PirateChain & Qortal 'trade' keys
  * 		<ul>
  * 			<li>private key required to sign P2SH redeem tx</li>
  * 			<li>private key could be used to create 'secret' (e.g. double-SHA256)</li>
@@ -42,12 +40,12 @@ import static org.ciyam.at.OpCode.calcOffset;
  * </li>
  * <li>Alice finds Qortal AT and wants to trade
  * 		<ul>
- * 			<li>Alice generates Dogecoin & Qortal 'trade' keys</li>
+ * 			<li>Alice generates PirateChain & Qortal 'trade' keys</li>
- * 			<li>Alice funds Dogecoin P2SH-A</li>
+ * 			<li>Alice funds PirateChain P2SH-A</li>
  * 			<li>Alice sends 'offer' MESSAGE to Bob from her Qortal trade address, containing:
  * 				<ul>
  * 					<li>hash-of-secret-A</li>
- * 					<li>her 'trade' Dogecoin PKH</li>
+ * 					<li>her 'trade' Pirate Chain public key</li>
  * 				</ul>
  * 			</li>
  * 		</ul>
@@ -58,7 +56,7 @@ import static org.ciyam.at.OpCode.calcOffset;
  * 			<li>Sends 'trade' MESSAGE to Qortal AT from his trade address, containing:
  * 				<ul>
  * 					<li>Alice's trade Qortal address</li>
- * 					<li>Alice's trade Dogecoin PKH</li>
+ * 					<li>Alice's trade Pirate Chain public key</li>
  * 					<li>hash-of-secret-A</li>
  * 				</ul>
  * 			</li>
@@ -77,48 +75,46 @@ import static org.ciyam.at.OpCode.calcOffset;
  * </li>
  * <li>Bob checks AT, extracts secret-A
  * 		<ul>
- * 			<li>Bob redeems P2SH-A using his Dogecoin trade key and secret-A</li>
+ * 			<li>Bob redeems P2SH-A using his PirateChain trade key and secret-A</li>
- * 			<li>P2SH-A DOGE funds end up at Dogecoin address determined by redeem transaction output(s)</li>
+ * 			<li>P2SH-A ARRR funds end up at PirateChain address determined by redeem transaction output(s)</li>
  * 		</ul>
  * </li>
  * </ul>
  */
-public class DogecoinACCTv2 implements ACCT {
+public class PirateChainACCTv3 implements ACCT {
 
-	private static final Logger LOGGER = LogManager.getLogger(DogecoinACCTv2.class);
+	public static final String NAME = PirateChainACCTv3.class.getSimpleName();
-
+	public static final byte[] CODE_BYTES_HASH = HashCode.fromString("fc2818ac0819ab658a065ab0d050e75f167921e2dce5969b9b7741e47e477d83").asBytes(); // SHA256 of AT code bytes
-	public static final String NAME = DogecoinACCTv2.class.getSimpleName();
-	public static final byte[] CODE_BYTES_HASH = HashCode.fromString("6fff38d6eeb06568a9c879c5628527730319844aa0de53f5f4ffab5506efe885").asBytes(); // SHA256 of AT code bytes
 
 	public static final int SECRET_LENGTH = 32;
 
 	/** <b>Value</b> offset into AT segment where 'mode' variable (long) is stored. (Multiply by MachineState.VALUE_SIZE for byte offset). */
-	private static final int MODE_VALUE_OFFSET = 61;
+	private static final int MODE_VALUE_OFFSET = 68;
 	/** <b>Byte</b> offset into AT state data where 'mode' variable (long) is stored. */
 	public static final int MODE_BYTE_OFFSET = MachineState.HEADER_LENGTH + (MODE_VALUE_OFFSET * MachineState.VALUE_SIZE);
 
 	public static class OfferMessageData {
-		public byte[] partnerDogecoinPKH;
+		public byte[] partnerPirateChainPublicKey;
 		public byte[] hashOfSecretA;
 		public long lockTimeA;
 	}
-	public static final int OFFER_MESSAGE_LENGTH = 20 /*partnerDogecoinPKH*/ + 20 /*hashOfSecretA*/ + 8 /*lockTimeA*/;
+	public static final int OFFER_MESSAGE_LENGTH = 33 /*partnerPirateChainPublicKey*/ + 20 /*hashOfSecretA*/ + 8 /*lockTimeA*/;
 	public static final int TRADE_MESSAGE_LENGTH = 32 /*partner's Qortal trade address (padded from 25 to 32)*/
-			+ 24 /*partner's Dogecoin PKH (padded from 20 to 24)*/
+			+ 40 /*partner's Pirate Chain public key (padded from 33 to 40)*/
 			+ 8 /*AT trade timeout (minutes)*/
 			+ 24 /*hash of secret-A (padded from 20 to 24)*/
 			+ 8 /*lockTimeA*/;
 	public static final int REDEEM_MESSAGE_LENGTH = 32 /*secret-A*/ + 32 /*partner's Qortal receiving address padded from 25 to 32*/;
 	public static final int CANCEL_MESSAGE_LENGTH = 32 /*AT creator's Qortal address*/;
 
-	private static DogecoinACCTv2 instance;
+	private static PirateChainACCTv3 instance;
 
-	private DogecoinACCTv2() {
+	private PirateChainACCTv3() {
 	}
 
-	public static synchronized DogecoinACCTv2 getInstance() {
+	public static synchronized PirateChainACCTv3 getInstance() {
 		if (instance == null)
-			instance = new DogecoinACCTv2();
+			instance = new PirateChainACCTv3();
 
 		return instance;
 	}
@@ -135,7 +131,7 @@ public class DogecoinACCTv2 implements ACCT {
 
 	@Override
 	public ForeignBlockchain getBlockchain() {
-		return Dogecoin.getInstance();
+		return PirateChain.getInstance();
 	}
 
 	/**
@@ -145,14 +141,14 @@ public class DogecoinACCTv2 implements ACCT {
 	 * 32-byte secret to the AT, before the AT automatically refunds the AT's creator.
 	 * 
 	 * @param creatorTradeAddress AT creator's trade Qortal address
-	 * @param dogecoinPublicKeyHash 20-byte HASH160 of creator's trade Dogecoin public key
+	 * @param pirateChainPublicKeyHash 33-byte creator's trade PirateChain public key
 	 * @param qortAmount how much QORT to pay trade partner if they send correct 32-byte secrets to AT
-	 * @param dogecoinAmount how much DOGE the AT creator is expecting to trade
+	 * @param arrrAmount how much ARRR the AT creator is expecting to trade
 	 * @param tradeTimeout suggested timeout for entire trade
 	 */
-	public static byte[] buildQortalAT(String creatorTradeAddress, byte[] dogecoinPublicKeyHash, long qortAmount, long dogecoinAmount, int tradeTimeout) {
+	public static byte[] buildQortalAT(String creatorTradeAddress, byte[] pirateChainPublicKeyHash, long qortAmount, long arrrAmount, int tradeTimeout) {
-		if (dogecoinPublicKeyHash.length != 20)
+		if (pirateChainPublicKeyHash.length != 33)
-			throw new IllegalArgumentException("Dogecoin public key hash should be 20 bytes");
+			throw new IllegalArgumentException("PirateChain public key hash should be 33 bytes");
 
 		// Labels for data segment addresses
 		int addrCounter = 0;
@@ -164,11 +160,11 @@ public class DogecoinACCTv2 implements ACCT {
 		final int addrCreatorTradeAddress3 = addrCounter++;
 		final int addrCreatorTradeAddress4 = addrCounter++;
 
-		final int addrDogecoinPublicKeyHash = addrCounter;
+		final int addrPirateChainPublicKeyHash = addrCounter;
-		addrCounter += 4;
+		addrCounter += 5;
 
 		final int addrQortAmount = addrCounter++;
-		final int addrDogecoinAmount = addrCounter++;
+		final int addrarrrAmount = addrCounter++;
 		final int addrTradeTimeout = addrCounter++;
 
 		final int addrMessageTxnType = addrCounter++;
@@ -179,8 +175,10 @@ public class DogecoinACCTv2 implements ACCT {
 		final int addrQortalPartnerAddressPointer = addrCounter++;
 		final int addrMessageSenderPointer = addrCounter++;
 
-		final int addrTradeMessagePartnerDogecoinPKHOffset = addrCounter++;
+		final int addrTradeMessagePartnerPirateChainPublicKeyFirst32BytesOffset = addrCounter++;
-		final int addrPartnerDogecoinPKHPointer = addrCounter++;
+		final int addrTradeMessagePartnerPirateChainPublicKeyLastByteOffset = addrCounter++; // Remainder of public key, plus timeout
+		final int addrPartnerPirateChainPublicKeyFirst32BytesPointer = addrCounter++;
+		final int addrPartnerPirateChainPublicKeyLastBytePointer = addrCounter++; // Remainder of public key
 		final int addrTradeMessageHashOfSecretAOffset = addrCounter++;
 		final int addrHashOfSecretAPointer = addrCounter++;
 
@@ -226,9 +224,12 @@ public class DogecoinACCTv2 implements ACCT {
 		final int addrHashOfSecretA = addrCounter;
 		addrCounter += 4;
 
-		final int addrPartnerDogecoinPKH = addrCounter;
+		final int addrPartnerPirateChainPublicKeyFirst32Bytes = addrCounter;
 		addrCounter += 4;
 
+		final int addrPartnerPirateChainPublicKeyLastByte = addrCounter;
+		addrCounter += 4; // We retrieve using GET_B_IND, so need to allow space for the full 32 bytes
+
 		final int addrPartnerReceivingAddress = addrCounter;
 		addrCounter += 4;
 
@@ -243,17 +244,17 @@ public class DogecoinACCTv2 implements ACCT {
 		byte[] creatorTradeAddressBytes = Base58.decode(creatorTradeAddress);
 		dataByteBuffer.put(Bytes.ensureCapacity(creatorTradeAddressBytes, 32, 0));
 
-		// Dogecoin public key hash
+		// PirateChain public key hash
-		assert dataByteBuffer.position() == addrDogecoinPublicKeyHash * MachineState.VALUE_SIZE : "addrDogecoinPublicKeyHash incorrect";
+		assert dataByteBuffer.position() == addrPirateChainPublicKeyHash * MachineState.VALUE_SIZE : "addrPirateChainPublicKeyHash incorrect";
-		dataByteBuffer.put(Bytes.ensureCapacity(dogecoinPublicKeyHash, 32, 0));
+		dataByteBuffer.put(Bytes.ensureCapacity(pirateChainPublicKeyHash, 40, 0));
 
 		// Redeem Qort amount
 		assert dataByteBuffer.position() == addrQortAmount * MachineState.VALUE_SIZE : "addrQortAmount incorrect";
 		dataByteBuffer.putLong(qortAmount);
 
-		// Expected Dogecoin amount
+		// Expected PirateChain amount
-		assert dataByteBuffer.position() == addrDogecoinAmount * MachineState.VALUE_SIZE : "addrDogecoinAmount incorrect";
+		assert dataByteBuffer.position() == addrarrrAmount * MachineState.VALUE_SIZE : "addrarrrAmount incorrect";
-		dataByteBuffer.putLong(dogecoinAmount);
+		dataByteBuffer.putLong(arrrAmount);
 
 		// Suggested trade timeout (minutes)
 		assert dataByteBuffer.position() == addrTradeTimeout * MachineState.VALUE_SIZE : "addrTradeTimeout incorrect";
@@ -283,17 +284,25 @@ public class DogecoinACCTv2 implements ACCT {
 		assert dataByteBuffer.position() == addrMessageSenderPointer * MachineState.VALUE_SIZE : "addrMessageSenderPointer incorrect";
 		dataByteBuffer.putLong(addrMessageSender1);
 
-		// Offset into 'trade' MESSAGE data payload for extracting partner's Dogecoin PKH
+		// Offset into 'trade' MESSAGE data payload for extracting first 32 bytes of partner's Pirate Chain public key
-		assert dataByteBuffer.position() == addrTradeMessagePartnerDogecoinPKHOffset * MachineState.VALUE_SIZE : "addrTradeMessagePartnerDogecoinPKHOffset incorrect";
+		assert dataByteBuffer.position() == addrTradeMessagePartnerPirateChainPublicKeyFirst32BytesOffset * MachineState.VALUE_SIZE : "addrTradeMessagePartnerPirateChainPublicKeyFirst32BytesOffset incorrect";
 		dataByteBuffer.putLong(32L);
 
-		// Index into data segment of partner's Dogecoin PKH, used by GET_B_IND
+		// Offset into 'trade' MESSAGE data payload for extracting last byte of public key
-		assert dataByteBuffer.position() == addrPartnerDogecoinPKHPointer * MachineState.VALUE_SIZE : "addrPartnerDogecoinPKHPointer incorrect";
+		assert dataByteBuffer.position() == addrTradeMessagePartnerPirateChainPublicKeyLastByteOffset * MachineState.VALUE_SIZE : "addrTradeMessagePartnerPirateChainPublicKeyLastByteOffset incorrect";
-		dataByteBuffer.putLong(addrPartnerDogecoinPKH);
+		dataByteBuffer.putLong(64L);
+
+		// Index into data segment of partner's Pirate Chain public key, used by GET_B_IND
+		assert dataByteBuffer.position() == addrPartnerPirateChainPublicKeyFirst32BytesPointer * MachineState.VALUE_SIZE : "addrPartnerPirateChainPublicKeyFirst32BytesPointer incorrect";
+		dataByteBuffer.putLong(addrPartnerPirateChainPublicKeyFirst32Bytes);
+
+		// Index into data segment of remainder of partner's Pirate Chain public key, used by GET_B_IND
+		assert dataByteBuffer.position() == addrPartnerPirateChainPublicKeyLastBytePointer * MachineState.VALUE_SIZE : "addrPartnerPirateChainPublicKeyLastBytePointer incorrect";
+		dataByteBuffer.putLong(addrPartnerPirateChainPublicKeyLastByte);
 
 		// Offset into 'trade' MESSAGE data payload for extracting hash-of-secret-A
 		assert dataByteBuffer.position() == addrTradeMessageHashOfSecretAOffset * MachineState.VALUE_SIZE : "addrTradeMessageHashOfSecretAOffset incorrect";
-		dataByteBuffer.putLong(64L);
+		dataByteBuffer.putLong(80L);
 
 		// Index into data segment to hash of secret A, used by GET_B_IND
 		assert dataByteBuffer.position() == addrHashOfSecretAPointer * MachineState.VALUE_SIZE : "addrHashOfSecretAPointer incorrect";
@@ -338,9 +347,6 @@ public class DogecoinACCTv2 implements ACCT {
 			try {
 				/* Initialization */
 
-				/* NOP - to ensure DOGECOIN ACCT is unique */
-				codeByteBuffer.put(OpCode.NOP.compile());
-
 				// Use AT creation 'timestamp' as starting point for finding transactions sent to AT
 				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.GET_CREATION_TIMESTAMP, addrLastTxnTimestamp));
 
@@ -429,12 +435,17 @@ public class DogecoinACCTv2 implements ACCT {
 				// Save B register into data segment starting at addrQortalPartnerAddress1 (as pointed to by addrQortalPartnerAddressPointer)
 				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrQortalPartnerAddressPointer));
 
-				// Extract trade partner's Dogecoin public key hash (PKH) from message into B
+				// Extract first 32 bytes of trade partner's Pirate Chain public key from message into B
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(QortalFunctionCode.PUT_PARTIAL_MESSAGE_FROM_TX_IN_A_INTO_B.value, addrTradeMessagePartnerDogecoinPKHOffset));
+				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(QortalFunctionCode.PUT_PARTIAL_MESSAGE_FROM_TX_IN_A_INTO_B.value, addrTradeMessagePartnerPirateChainPublicKeyFirst32BytesOffset));
-				// Store partner's Dogecoin PKH (we only really use values from B1-B3)
+				// Store first 32 bytes of partner's Pirate Chain public key
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrPartnerDogecoinPKHPointer));
+				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrPartnerPirateChainPublicKeyFirst32BytesPointer));
-				// Extract AT trade timeout (minutes) (from B4)
+
-				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.GET_B4, addrRefundTimeout));
+				// Extract last byte of public key, plus trade timeout, from message into B
+				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(QortalFunctionCode.PUT_PARTIAL_MESSAGE_FROM_TX_IN_A_INTO_B.value, addrTradeMessagePartnerPirateChainPublicKeyLastByteOffset));
+				// Store last byte of partner's Pirate Chain public key
+				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.GET_B_IND, addrPartnerPirateChainPublicKeyLastBytePointer));
+				// Extract AT trade timeout (minutes) (from B2)
+				codeByteBuffer.put(OpCode.EXT_FUN_RET.compile(FunctionCode.GET_B2, addrRefundTimeout));
 
 				// Grab next 32 bytes
 				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(QortalFunctionCode.PUT_PARTIAL_MESSAGE_FROM_TX_IN_A_INTO_B.value, addrTradeMessageHashOfSecretAOffset));
@@ -465,9 +476,6 @@ public class DogecoinACCTv2 implements ACCT {
 				/* Transaction processing loop */
 				labelRedeemTxnLoop = codeByteBuffer.position();
 
-				/* Sleep until message arrives */
-				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(QortalFunctionCode.SLEEP_UNTIL_MESSAGE.value, addrLastTxnTimestamp));
-
 				// Find next transaction to this AT since the last one (if any)
 				codeByteBuffer.put(OpCode.EXT_FUN_DAT.compile(FunctionCode.PUT_TX_AFTER_TIMESTAMP_INTO_A, addrLastTxnTimestamp));
 				// If no transaction found, A will be zero. If A is zero, set addrComparator to 1, otherwise 0.
@@ -546,7 +554,7 @@ public class DogecoinACCTv2 implements ACCT {
 				// We're finished forever (finishing auto-refunds remaining balance to AT creator)
 				codeByteBuffer.put(OpCode.FIN_IMD.compile());
 			} catch (CompilationException e) {
-				throw new IllegalStateException("Unable to compile DOGE-QORT ACCT?", e);
+				throw new IllegalStateException("Unable to compile ARRR-QORT ACCT?", e);
 			}
 		}
 
@@ -555,7 +563,7 @@ public class DogecoinACCTv2 implements ACCT {
 		byte[] codeBytes = new byte[codeByteBuffer.limit()];
 		codeByteBuffer.get(codeBytes);
 
-		assert Arrays.equals(Crypto.digest(codeBytes), DogecoinACCTv2.CODE_BYTES_HASH)
+		assert Arrays.equals(Crypto.digest(codeBytes), PirateChainACCTv3.CODE_BYTES_HASH)
 			: String.format("BTCACCT.CODE_BYTES_HASH mismatch: expected %s, actual %s", HashCode.fromBytes(CODE_BYTES_HASH), HashCode.fromBytes(Crypto.digest(codeBytes)));
 
 		final short ciyamAtVersion = 2;
@@ -593,7 +601,7 @@ public class DogecoinACCTv2 implements ACCT {
 
 		CrossChainTradeData tradeData = new CrossChainTradeData();
 
-		tradeData.foreignBlockchain = SupportedBlockchain.DOGECOIN.name();
+		tradeData.foreignBlockchain = SupportedBlockchain.PIRATECHAIN.name();
 		tradeData.acctName = NAME;
 
 		tradeData.qortalAtAddress = atAddress;
@@ -614,10 +622,10 @@ public class DogecoinACCTv2 implements ACCT {
 		tradeData.qortalCreatorTradeAddress = Base58.encode(addressBytes);
 		dataByteBuffer.position(dataByteBuffer.position() + 32 - addressBytes.length);
 
-		// Creator's Dogecoin/foreign public key hash
+		// Creator's PirateChain/foreign public key (full 33 bytes, not hashed, so ignore references to "PKH")
-		tradeData.creatorForeignPKH = new byte[20];
+		tradeData.creatorForeignPKH = new byte[33];
 		dataByteBuffer.get(tradeData.creatorForeignPKH);
-		dataByteBuffer.position(dataByteBuffer.position() + 32 - tradeData.creatorForeignPKH.length); // skip to 32 bytes
+		dataByteBuffer.position(dataByteBuffer.position() + 40 - tradeData.creatorForeignPKH.length); // skip to 40 bytes
 
 		// We don't use secret-B
 		tradeData.hashOfSecretB = null;
@@ -625,7 +633,7 @@ public class DogecoinACCTv2 implements ACCT {
 		// Redeem payout
 		tradeData.qortAmount = dataByteBuffer.getLong();
 
-		// Expected DOGE amount
+		// Expected ARRR amount
 		tradeData.expectedForeignAmount = dataByteBuffer.getLong();
 
 		// Trade timeout
@@ -649,10 +657,16 @@ public class DogecoinACCTv2 implements ACCT {
 		// Skip pointer to message sender
 		dataByteBuffer.position(dataByteBuffer.position() + 8);
 
-		// Skip 'trade' message data offset for partner's Dogecoin PKH
+		// Skip 'trade' message data offset for first 32 bytes of partner's Pirate Chain public key
 		dataByteBuffer.position(dataByteBuffer.position() + 8);
 
-		// Skip pointer to partner's Dogecoin PKH
+		// Skip 'trade' message data offset for last 32 byte of partner's Pirate Chain public key
+		dataByteBuffer.position(dataByteBuffer.position() + 8);
+
+		// Skip pointer to partner's Pirate Chain public key (first 32 bytes)
+		dataByteBuffer.position(dataByteBuffer.position() + 8);
+
+		// Skip pointer to partner's Pirate Chain public key (last byte)
 		dataByteBuffer.position(dataByteBuffer.position() + 8);
 
 		// Skip 'trade' message data offset for hash-of-secret-A
@@ -718,10 +732,10 @@ public class DogecoinACCTv2 implements ACCT {
 		dataByteBuffer.get(hashOfSecretA);
 		dataByteBuffer.position(dataByteBuffer.position() + 32 - hashOfSecretA.length); // skip to 32 bytes
 
-		// Potential partner's Dogecoin PKH
+		// Potential partner's PirateChain public key
-		byte[] partnerDogecoinPKH = new byte[20];
+		byte[] partnerPirateChainPublicKey = new byte[33];
-		dataByteBuffer.get(partnerDogecoinPKH);
+		dataByteBuffer.get(partnerPirateChainPublicKey);
-		dataByteBuffer.position(dataByteBuffer.position() + 32 - partnerDogecoinPKH.length); // skip to 32 bytes
+		dataByteBuffer.position(dataByteBuffer.position() + 64 - partnerPirateChainPublicKey.length); // skip to 64 bytes
 
 		// Partner's receiving address (if present)
 		byte[] partnerReceivingAddress = new byte[25];
@@ -740,7 +754,7 @@ public class DogecoinACCTv2 implements ACCT {
 			tradeData.tradeRefundHeight = new Timestamp(tradeRefundTimestamp).blockHeight;
 			tradeData.qortalPartnerAddress = qortalRecipient;
 			tradeData.hashOfSecretA = hashOfSecretA;
-			tradeData.partnerForeignPKH = partnerDogecoinPKH;
+			tradeData.partnerForeignPKH = partnerPirateChainPublicKey; // Not hashed
 			tradeData.lockTimeA = lockTimeA;
 
 			if (mode == AcctMode.REDEEMED)
@@ -755,9 +769,9 @@ public class DogecoinACCTv2 implements ACCT {
 	}
 
 	/** Returns 'offer' MESSAGE payload for trade partner to send to AT creator's trade address. */
-	public static byte[] buildOfferMessage(byte[] partnerBitcoinPKH, byte[] hashOfSecretA, int lockTimeA) {
+	public static byte[] buildOfferMessage(byte[] partnerBitcoinPublicKey, byte[] hashOfSecretA, int lockTimeA) {
 		byte[] lockTimeABytes = BitTwiddling.toBEByteArray((long) lockTimeA);
-		return Bytes.concat(partnerBitcoinPKH, hashOfSecretA, lockTimeABytes);
+		return Bytes.concat(partnerBitcoinPublicKey, hashOfSecretA, lockTimeABytes);
 	}
 
 	/** Returns info extracted from 'offer' MESSAGE payload sent by trade partner to AT creator's trade address, or null if not valid. */
@@ -766,25 +780,25 @@ public class DogecoinACCTv2 implements ACCT {
 			return null;
 
 		OfferMessageData offerMessageData = new OfferMessageData();
-		offerMessageData.partnerDogecoinPKH = Arrays.copyOfRange(messageData, 0, 20);
+		offerMessageData.partnerPirateChainPublicKey = Arrays.copyOfRange(messageData, 0, 33);
-		offerMessageData.hashOfSecretA = Arrays.copyOfRange(messageData, 20, 40);
+		offerMessageData.hashOfSecretA = Arrays.copyOfRange(messageData, 33, 53);
-		offerMessageData.lockTimeA = BitTwiddling.longFromBEBytes(messageData, 40);
+		offerMessageData.lockTimeA = BitTwiddling.longFromBEBytes(messageData, 53);
 
 		return offerMessageData;
 	}
 
 	/** Returns 'trade' MESSAGE payload for AT creator to send to AT. */
-	public static byte[] buildTradeMessage(String partnerQortalTradeAddress, byte[] partnerBitcoinPKH, byte[] hashOfSecretA, int lockTimeA, int refundTimeout) {
+	public static byte[] buildTradeMessage(String partnerQortalTradeAddress, byte[] partnerBitcoinPublicKey, byte[] hashOfSecretA, int lockTimeA, int refundTimeout) {
 		byte[] data = new byte[TRADE_MESSAGE_LENGTH];
 		byte[] partnerQortalAddressBytes = Base58.decode(partnerQortalTradeAddress);
 		byte[] lockTimeABytes = BitTwiddling.toBEByteArray((long) lockTimeA);
 		byte[] refundTimeoutBytes = BitTwiddling.toBEByteArray((long) refundTimeout);
 
 		System.arraycopy(partnerQortalAddressBytes, 0, data, 0, partnerQortalAddressBytes.length);
-		System.arraycopy(partnerBitcoinPKH, 0, data, 32, partnerBitcoinPKH.length);
+		System.arraycopy(partnerBitcoinPublicKey, 0, data, 32, partnerBitcoinPublicKey.length);
-		System.arraycopy(refundTimeoutBytes, 0, data, 56, refundTimeoutBytes.length);
+		System.arraycopy(refundTimeoutBytes, 0, data, 72, refundTimeoutBytes.length);
-		System.arraycopy(hashOfSecretA, 0, data, 64, hashOfSecretA.length);
+		System.arraycopy(hashOfSecretA, 0, data, 80, hashOfSecretA.length);
-		System.arraycopy(lockTimeABytes, 0, data, 88, lockTimeABytes.length);
+		System.arraycopy(lockTimeABytes, 0, data, 104, lockTimeABytes.length);
 
 		return data;
 	}

src/main/java/org/qortal/crosschain/PirateChainHTLC.java

@@ -0,0 +1,404 @@
+package org.qortal.crosschain;
+
+import com.google.common.hash.HashCode;
+import com.google.common.primitives.Bytes;
+import org.bitcoinj.core.*;
+import org.bitcoinj.script.Script;
+import org.bitcoinj.script.ScriptChunk;
+import org.qortal.crypto.Crypto;
+import org.qortal.utils.Base58;
+import org.qortal.utils.BitTwiddling;
+
+import java.util.*;
+import static org.qortal.crosschain.BitcoinyHTLC.Status;
+
+public class PirateChainHTLC {
+
+	public static final int SECRET_LENGTH = 32;
+	public static final int MIN_LOCKTIME = 1500000000;
+
+	public static final long NO_LOCKTIME_NO_RBF_SEQUENCE = 0xFFFFFFFFL;
+	public static final long LOCKTIME_NO_RBF_SEQUENCE = NO_LOCKTIME_NO_RBF_SEQUENCE - 1;
+
+	// Assuming node's trade-bot has no more than 100 entries?
+	private static final int MAX_CACHE_ENTRIES = 100;
+
+	// Max time-to-live for cache entries (milliseconds)
+	private static final long CACHE_TIMEOUT = 30_000L;
+
+	@SuppressWarnings("serial")
+	private static final Map<String, byte[]> SECRET_CACHE = new LinkedHashMap<>(MAX_CACHE_ENTRIES + 1, 0.75F, true) {
+		// This method is called just after a new entry has been added
+		@Override
+		public boolean removeEldestEntry(Map.Entry<String, byte[]> eldest) {
+			return size() > MAX_CACHE_ENTRIES;
+		}
+	};
+	private static final byte[] NO_SECRET_CACHE_ENTRY = new byte[0];
+
+	@SuppressWarnings("serial")
+	private static final Map<String, Status> STATUS_CACHE = new LinkedHashMap<>(MAX_CACHE_ENTRIES + 1, 0.75F, true) {
+		// This method is called just after a new entry has been added
+		@Override
+		public boolean removeEldestEntry(Map.Entry<String, Status> eldest) {
+			return size() > MAX_CACHE_ENTRIES;
+		}
+	};
+
+	/*
+	 * OP_RETURN + OP_PUSHDATA1 + bytes (not part of actual redeem script - used for "push only" secondary output when funding P2SH)
+	 *
+	 * OP_IF (if top stack value isn't false) (true=refund; false=redeem) (boolean is then removed from stack)
+	 * 		<push 4 bytes> <intended locktime>
+	 * 		OP_CHECKLOCKTIMEVERIFY (if stack locktime greater than transaction's lock time - i.e. refunding but too soon - then fail validation)
+	 * 		OP_DROP (remove locktime from top of stack)
+	 * 		<push 33 bytes> <intended refunder public key>
+	 * 		OP_CHECKSIG (check signature and public key are correct; returns 1 or 0)
+	 * OP_ELSE (if top stack value was false, i.e. attempting to redeem)
+	 * 		OP_SIZE (push length of top item - the secret - to the top of the stack)
+	 * 		<push 1 byte> 32
+	 * 		OP_EQUALVERIFY (unhashed secret must be 32 bytes in length)
+	 * 		OP_HASH160 (hash the secret)
+	 * 		<push 20 bytes> <intended secret hash>
+	 * 		OP_EQUALVERIFY (ensure hash of supplied secret matches intended secret hash; transaction invalid if no match)
+	 * 		<push 33 bytes> <intended redeemer public key>
+	 * 		OP_CHECKSIG (check signature and public key are correct; returns 1 or 0)
+	 * OP_ENDIF
+	 */
+
+	private static final byte[] pushOnlyPrefix = HashCode.fromString("6a4c").asBytes(); // OP_RETURN + push(redeem script)
+	private static final byte[] redeemScript1 = HashCode.fromString("6304").asBytes(); // OP_IF push(4 bytes locktime)
+	private static final byte[] redeemScript2 = HashCode.fromString("b17521").asBytes(); // OP_CHECKLOCKTIMEVERIFY OP_DROP push(33 bytes refund pubkey)
+	private static final byte[] redeemScript3 = HashCode.fromString("ac6782012088a914").asBytes(); // OP_CHECKSIG OP_ELSE OP_SIZE push(0x20) OP_EQUALVERIFY OP_HASH160 push(20 bytes hash of secret)
+	private static final byte[] redeemScript4 = HashCode.fromString("8821").asBytes(); // OP_EQUALVERIFY push(33 bytes redeem pubkey)
+	private static final byte[] redeemScript5 = HashCode.fromString("ac68").asBytes(); // OP_CHECKSIG OP_ENDIF
+
+	/**
+	 * Returns redeemScript used for cross-chain trading.
+	 * <p>
+	 * See comments in {@link PirateChainHTLC} for more details.
+	 * 
+	 * @param refunderPubKey 33-byte P2SH funder's public key, for refunding purposes
+	 * @param lockTime seconds-since-epoch threshold, after which P2SH funder can claim refund
+	 * @param redeemerPubKey 33-byte P2SH redeemer's public key
+	 * @param hashOfSecret 20-byte HASH160 of secret, used by P2SH redeemer to claim funds
+	 */
+	public static byte[] buildScript(byte[] refunderPubKey, int lockTime, byte[] redeemerPubKey, byte[] hashOfSecret) {
+		return Bytes.concat(redeemScript1, BitTwiddling.toLEByteArray((int) (lockTime & 0xffffffffL)), redeemScript2,
+				refunderPubKey, redeemScript3, hashOfSecret, redeemScript4, redeemerPubKey, redeemScript5);
+	}
+
+	/**
+	 * Alternative to buildScript() above, this time with a prefix suitable for adding the redeem script
+	 * to a "push only" output (via OP_RETURN followed by OP_PUSHDATA1)
+	 *
+	 * @param refunderPubKey 33-byte P2SH funder's public key, for refunding purposes
+	 * @param lockTime seconds-since-epoch threshold, after which P2SH funder can claim refund
+	 * @param redeemerPubKey 33-byte P2SH redeemer's public key
+	 * @param hashOfSecret 20-byte HASH160 of secret, used by P2SH redeemer to claim funds
+	 * @return
+	 */
+	public static byte[] buildScriptWithPrefix(byte[] refunderPubKey, int lockTime, byte[] redeemerPubKey, byte[] hashOfSecret) {
+		byte[] redeemScript = buildScript(refunderPubKey, lockTime, redeemerPubKey, hashOfSecret);
+		int size = redeemScript.length;
+		String sizeHex = Integer.toHexString(size & 0xFF);
+		return Bytes.concat(pushOnlyPrefix, HashCode.fromString(sizeHex).asBytes(), redeemScript);
+	}
+
+	/**
+	 * Returns 'secret', if any, given HTLC's P2SH address.
+	 * <p>
+	 * @throws ForeignBlockchainException
+	 */
+	public static byte[] findHtlcSecret(Bitcoiny bitcoiny, String p2shAddress) throws ForeignBlockchainException {
+		NetworkParameters params = bitcoiny.getNetworkParameters();
+		String compoundKey = String.format("%s-%s-%d", params.getId(), p2shAddress, System.currentTimeMillis() / CACHE_TIMEOUT);
+
+		byte[] secret = SECRET_CACHE.getOrDefault(compoundKey, NO_SECRET_CACHE_ENTRY);
+		if (secret != NO_SECRET_CACHE_ENTRY)
+			return secret;
+
+		List<byte[]> rawTransactions = bitcoiny.getAddressTransactions(p2shAddress);
+
+		for (byte[] rawTransaction : rawTransactions) {
+			Transaction transaction = new Transaction(params, rawTransaction);
+
+			// Cycle through inputs, looking for one that spends our HTLC
+			for (TransactionInput input : transaction.getInputs()) {
+				Script scriptSig = input.getScriptSig();
+				List<ScriptChunk> scriptChunks = scriptSig.getChunks();
+
+				// Expected number of script chunks for redeem. Refund might not have the same number.
+				int expectedChunkCount = 1 /*secret*/ + 1 /*sig*/ + 1 /*pubkey*/ + 1 /*redeemScript*/;
+				if (scriptChunks.size() != expectedChunkCount)
+					continue;
+
+				// We're expecting last chunk to contain the actual redeemScript
+				ScriptChunk lastChunk = scriptChunks.get(scriptChunks.size() - 1);
+				byte[] redeemScriptBytes = lastChunk.data;
+
+				// If non-push scripts, redeemScript will be null
+				if (redeemScriptBytes == null)
+					continue;
+
+				byte[] redeemScriptHash = Crypto.hash160(redeemScriptBytes);
+				Address inputAddress = LegacyAddress.fromScriptHash(params, redeemScriptHash);
+
+				if (!inputAddress.toString().equals(p2shAddress))
+					// Input isn't spending our HTLC
+					continue;
+
+				secret = scriptChunks.get(0).data;
+				if (secret.length != PirateChainHTLC.SECRET_LENGTH)
+					continue;
+
+				// Cache secret for a while
+				SECRET_CACHE.put(compoundKey, secret);
+
+				return secret;
+			}
+		}
+
+		// Cache negative result
+		SECRET_CACHE.put(compoundKey, null);
+
+		return null;
+	}
+
+	/**
+	 * Returns a string containing the txid of the transaction that funded supplied <tt>p2shAddress</tt>
+	 * We have to do this in a bit of a roundabout way due to the Pirate Light Client server omitting
+	 * transaction hashes from the raw transaction data.
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	public static String getFundingTxid(BitcoinyBlockchainProvider blockchain, String p2shAddress) throws ForeignBlockchainException {
+		byte[] ourScriptPubKey = addressToScriptPubKey(p2shAddress);
+		// HASH160(redeem script) for this p2shAddress
+		byte[] ourRedeemScriptHash = addressToRedeemScriptHash(p2shAddress);
+
+
+		// Firstly look for an unspent output
+
+		// Note: we can't include unconfirmed transactions here because the Pirate light wallet server requires a block range
+		List<UnspentOutput> unspentOutputs = blockchain.getUnspentOutputs(p2shAddress, false);
+		for (UnspentOutput unspentOutput : unspentOutputs) {
+
+			if (!Arrays.equals(ourScriptPubKey, unspentOutput.script)) {
+				continue;
+			}
+
+			return HashCode.fromBytes(unspentOutput.hash).toString();
+		}
+
+
+		// No valid unspent outputs, so must be already spent...
+
+		// Note: we can't include unconfirmed transactions here because the Pirate light wallet server requires a block range
+		List<BitcoinyTransaction> transactions = blockchain.getAddressBitcoinyTransactions(p2shAddress, BitcoinyBlockchainProvider.EXCLUDE_UNCONFIRMED);
+
+		// Sort by confirmed first, followed by ascending height
+		transactions.sort(BitcoinyTransaction.CONFIRMED_FIRST.thenComparing(BitcoinyTransaction::getHeight));
+
+		for (BitcoinyTransaction bitcoinyTransaction : transactions) {
+
+			// Acceptable funding is one transaction output, so we're expecting only one input
+			if (bitcoinyTransaction.inputs.size() != 1)
+				// Wrong number of inputs
+				continue;
+
+			String scriptSig = bitcoinyTransaction.inputs.get(0).scriptSig;
+
+			List<byte[]> scriptSigChunks = extractScriptSigChunks(HashCode.fromString(scriptSig).asBytes());
+			if (scriptSigChunks.size() < 3 || scriptSigChunks.size() > 4)
+				// Not valid chunks for our form of HTLC
+				continue;
+
+			// Last chunk is redeem script
+			byte[] redeemScriptBytes = scriptSigChunks.get(scriptSigChunks.size() - 1);
+			byte[] redeemScriptHash = Crypto.hash160(redeemScriptBytes);
+			if (!Arrays.equals(redeemScriptHash, ourRedeemScriptHash))
+				// Not spending our specific HTLC redeem script
+				continue;
+
+			return bitcoinyTransaction.inputs.get(0).outputTxHash;
+
+		}
+
+		return null;
+	}
+
+	/**
+	 * Returns a string containing the unspent txid of the transaction that funded supplied <tt>p2shAddress</tt>
+	 * and is at least the value specified in <tt>minimumAmount</tt>
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	public static String getUnspentFundingTxid(BitcoinyBlockchainProvider blockchain, String p2shAddress, long minimumAmount) throws ForeignBlockchainException {
+		byte[] ourScriptPubKey = addressToScriptPubKey(p2shAddress);
+
+		// Note: we can't include unconfirmed transactions here because the Pirate light wallet server requires a block range
+		List<UnspentOutput> unspentOutputs = blockchain.getUnspentOutputs(p2shAddress, false);
+		for (UnspentOutput unspentOutput : unspentOutputs) {
+
+			if (!Arrays.equals(ourScriptPubKey, unspentOutput.script)) {
+				// Not funding our specific HTLC script hash
+				continue;
+			}
+
+			if (unspentOutput.value < minimumAmount) {
+				// Not funding the required amount
+				continue;
+			}
+
+			return HashCode.fromBytes(unspentOutput.hash).toString();
+		}
+
+
+		// No valid unspent outputs, so must be already spent
+		return null;
+	}
+
+	/**
+	 * Returns HTLC status, given P2SH address and expected redeem/refund amount
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	public static Status determineHtlcStatus(BitcoinyBlockchainProvider blockchain, String p2shAddress, long minimumAmount) throws ForeignBlockchainException {
+		String compoundKey = String.format("%s-%s-%d", blockchain.getNetId(), p2shAddress, System.currentTimeMillis() / CACHE_TIMEOUT);
+
+		Status cachedStatus = STATUS_CACHE.getOrDefault(compoundKey, null);
+		if (cachedStatus != null)
+			return cachedStatus;
+
+		byte[] ourScriptPubKey = addressToScriptPubKey(p2shAddress);
+
+		// Note: we can't include unconfirmed transactions here because the Pirate light wallet server requires a block range
+		List<BitcoinyTransaction> transactions = blockchain.getAddressBitcoinyTransactions(p2shAddress, BitcoinyBlockchainProvider.EXCLUDE_UNCONFIRMED);
+
+		// Sort by confirmed first, followed by ascending height
+		transactions.sort(BitcoinyTransaction.CONFIRMED_FIRST.thenComparing(BitcoinyTransaction::getHeight));
+
+		// Transaction cache
+		//Map<String, BitcoinyTransaction> transactionsByHash = new HashMap<>();
+		// HASH160(redeem script) for this p2shAddress
+		byte[] ourRedeemScriptHash = addressToRedeemScriptHash(p2shAddress);
+
+		// Check for spends first, caching full transaction info as we progress just in case we don't return in this loop
+		for (BitcoinyTransaction bitcoinyTransaction : transactions) {
+
+			// Cache for possible later reuse
+			// transactionsByHash.put(transactionInfo.txHash, bitcoinyTransaction);
+
+			// Acceptable funding is one transaction output, so we're expecting only one input
+			if (bitcoinyTransaction.inputs.size() != 1)
+				// Wrong number of inputs
+				continue;
+
+			String scriptSig = bitcoinyTransaction.inputs.get(0).scriptSig;
+
+			List<byte[]> scriptSigChunks = extractScriptSigChunks(HashCode.fromString(scriptSig).asBytes());
+			if (scriptSigChunks.size() < 3 || scriptSigChunks.size() > 4)
+				// Not valid chunks for our form of HTLC
+				continue;
+
+			// Last chunk is redeem script
+			byte[] redeemScriptBytes = scriptSigChunks.get(scriptSigChunks.size() - 1);
+			byte[] redeemScriptHash = Crypto.hash160(redeemScriptBytes);
+			if (!Arrays.equals(redeemScriptHash, ourRedeemScriptHash))
+				// Not spending our specific HTLC redeem script
+				continue;
+
+			if (scriptSigChunks.size() == 4)
+				// If we have 4 chunks, then secret is present, hence redeem
+				cachedStatus = bitcoinyTransaction.height == 0 ? Status.REDEEM_IN_PROGRESS : Status.REDEEMED;
+			else
+				cachedStatus = bitcoinyTransaction.height == 0 ? Status.REFUND_IN_PROGRESS : Status.REFUNDED;
+
+			STATUS_CACHE.put(compoundKey, cachedStatus);
+			return cachedStatus;
+		}
+
+		String ourScriptPubKeyHex = HashCode.fromBytes(ourScriptPubKey).toString();
+
+		// Check for funding
+		for (BitcoinyTransaction bitcoinyTransaction : transactions) {
+			if (bitcoinyTransaction == null)
+				// Should be present in map!
+				throw new ForeignBlockchainException("Cached Bitcoin transaction now missing?");
+
+			// Check outputs for our specific P2SH
+			for (BitcoinyTransaction.Output output : bitcoinyTransaction.outputs) {
+				// Check amount
+				if (output.value < minimumAmount)
+					// Output amount too small (not taking fees into account)
+					continue;
+
+				String scriptPubKeyHex = output.scriptPubKey;
+				if (!scriptPubKeyHex.equals(ourScriptPubKeyHex))
+					// Not funding our specific P2SH
+					continue;
+
+				cachedStatus = bitcoinyTransaction.height == 0 ? Status.FUNDING_IN_PROGRESS : Status.FUNDED;
+				STATUS_CACHE.put(compoundKey, cachedStatus);
+				return cachedStatus;
+			}
+		}
+
+		cachedStatus = Status.UNFUNDED;
+		STATUS_CACHE.put(compoundKey, cachedStatus);
+		return cachedStatus;
+	}
+
+	private static List<byte[]> extractScriptSigChunks(byte[] scriptSigBytes) {
+		List<byte[]> chunks = new ArrayList<>();
+
+		int offset = 0;
+		int previousOffset = 0;
+		while (offset < scriptSigBytes.length) {
+			byte pushOp = scriptSigBytes[offset++];
+
+			if (pushOp < 0 || pushOp > 0x4c)
+				// Unacceptable OP
+				return Collections.emptyList();
+
+			// Special treatment for OP_PUSHDATA1
+			if (pushOp == 0x4c) {
+				if (offset >= scriptSigBytes.length)
+					// Run out of scriptSig bytes?
+					return Collections.emptyList();
+
+				pushOp = scriptSigBytes[offset++];
+			}
+
+			previousOffset = offset;
+			offset += Byte.toUnsignedInt(pushOp);
+
+			byte[] chunk = Arrays.copyOfRange(scriptSigBytes, previousOffset, offset);
+			chunks.add(chunk);
+		}
+
+		return chunks;
+	}
+
+	private static byte[] addressToScriptPubKey(String p2shAddress) {
+		// We want the HASH160 part of the P2SH address
+		byte[] p2shAddressBytes = Base58.decode(p2shAddress);
+
+		byte[] scriptPubKey = new byte[1 + 1 + 20 + 1];
+		scriptPubKey[0x00] = (byte) 0xa9; /* OP_HASH160 */
+		scriptPubKey[0x01] = (byte) 0x14; /* PUSH 0x14 bytes */
+		System.arraycopy(p2shAddressBytes, 1, scriptPubKey, 2, 0x14);
+		scriptPubKey[0x16] = (byte) 0x87; /* OP_EQUAL */
+
+		return scriptPubKey;
+	}
+
+	private static byte[] addressToRedeemScriptHash(String p2shAddress) {
+		// We want the HASH160 part of the P2SH address
+		byte[] p2shAddressBytes = Base58.decode(p2shAddress);
+
+		return Arrays.copyOfRange(p2shAddressBytes, 1, 1 + 20);
+	}
+
+}

src/main/java/org/qortal/crosschain/PirateLightClient.java

@@ -0,0 +1,649 @@
+package org.qortal.crosschain;
+
+import cash.z.wallet.sdk.rpc.CompactFormats.*;
+import cash.z.wallet.sdk.rpc.CompactTxStreamerGrpc;
+import cash.z.wallet.sdk.rpc.Service;
+import cash.z.wallet.sdk.rpc.Service.*;
+import com.google.common.hash.HashCode;
+import com.google.protobuf.ByteString;
+import io.grpc.ManagedChannel;
+import io.grpc.ManagedChannelBuilder;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.json.simple.JSONArray;
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
+import org.qortal.settings.Settings;
+import org.qortal.transform.TransformationException;
+
+import java.math.BigDecimal;
+import java.util.*;
+import java.util.concurrent.TimeUnit;
+
+/** Pirate Chain network support for querying Bitcoiny-related info like block headers, transaction outputs, etc. */
+public class PirateLightClient extends BitcoinyBlockchainProvider {
+
+	private static final Logger LOGGER = LogManager.getLogger(PirateLightClient.class);
+	private static final Random RANDOM = new Random();
+
+	private static final int RESPONSE_TIME_READINGS = 5;
+	private static final long MAX_AVG_RESPONSE_TIME = 500L; // ms
+
+	public static class Server {
+		String hostname;
+
+		public enum ConnectionType { TCP, SSL }
+		ConnectionType connectionType;
+
+		int port;
+		private List<Long> responseTimes = new ArrayList<>();
+
+		public Server(String hostname, ConnectionType connectionType, int port) {
+			this.hostname = hostname;
+			this.connectionType = connectionType;
+			this.port = port;
+		}
+
+		public void addResponseTime(long responseTime) {
+			while (this.responseTimes.size() > RESPONSE_TIME_READINGS) {
+				this.responseTimes.remove(0);
+			}
+			this.responseTimes.add(responseTime);
+		}
+
+		public long averageResponseTime() {
+			if (this.responseTimes.size() < RESPONSE_TIME_READINGS) {
+				// Not enough readings yet
+				return 0L;
+			}
+			OptionalDouble average = this.responseTimes.stream().mapToDouble(a -> a).average();
+			if (average.isPresent()) {
+				return Double.valueOf(average.getAsDouble()).longValue();
+			}
+			return 0L;
+		}
+
+		@Override
+		public boolean equals(Object other) {
+			if (other == this)
+				return true;
+
+			if (!(other instanceof Server))
+				return false;
+
+			Server otherServer = (Server) other;
+
+			return this.connectionType == otherServer.connectionType
+					&& this.port == otherServer.port
+					&& this.hostname.equals(otherServer.hostname);
+		}
+
+		@Override
+		public int hashCode() {
+			return this.hostname.hashCode() ^ this.port;
+		}
+
+		@Override
+		public String toString() {
+			return String.format("%s:%s:%d", this.connectionType.name(), this.hostname, this.port);
+		}
+	}
+	private Set<Server> servers = new HashSet<>();
+	private List<Server> remainingServers = new ArrayList<>();
+	private Set<Server> uselessServers = Collections.synchronizedSet(new HashSet<>());
+
+	private final String netId;
+	private final String expectedGenesisHash;
+	private final Map<Server.ConnectionType, Integer> defaultPorts = new EnumMap<>(Server.ConnectionType.class);
+	private Bitcoiny blockchain;
+
+	private final Object serverLock = new Object();
+	private Server currentServer;
+	private ManagedChannel channel;
+	private int nextId = 1;
+
+	private static final int TX_CACHE_SIZE = 1000;
+	@SuppressWarnings("serial")
+	private final Map<String, BitcoinyTransaction> transactionCache = Collections.synchronizedMap(new LinkedHashMap<>(TX_CACHE_SIZE + 1, 0.75F, true) {
+		// This method is called just after a new entry has been added
+		@Override
+		public boolean removeEldestEntry(Map.Entry<String, BitcoinyTransaction> eldest) {
+			return size() > TX_CACHE_SIZE;
+		}
+	});
+
+	// Constructors
+
+	public PirateLightClient(String netId, String genesisHash, Collection<Server> initialServerList, Map<Server.ConnectionType, Integer> defaultPorts) {
+		this.netId = netId;
+		this.expectedGenesisHash = genesisHash;
+		this.servers.addAll(initialServerList);
+		this.defaultPorts.putAll(defaultPorts);
+	}
+
+	// Methods for use by other classes
+
+	@Override
+	public void setBlockchain(Bitcoiny blockchain) {
+		this.blockchain = blockchain;
+	}
+
+	@Override
+	public String getNetId() {
+		return this.netId;
+	}
+
+	/**
+	 * Returns current blockchain height.
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	@Override
+	public int getCurrentHeight() throws ForeignBlockchainException {
+		BlockID latestBlock = this.getCompactTxStreamerStub().getLatestBlock(null);
+
+		if (!(latestBlock instanceof BlockID))
+			throw new ForeignBlockchainException.NetworkException("Unexpected output from Pirate Chain getLatestBlock gRPC");
+
+		return (int)latestBlock.getHeight();
+	}
+
+	/**
+	 * Returns list of compact blocks, starting from <tt>startHeight</tt> inclusive.
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 * @return
+	 */
+	@Override
+	public List<CompactBlock> getCompactBlocks(int startHeight, int count) throws ForeignBlockchainException {
+		BlockID startBlock = BlockID.newBuilder().setHeight(startHeight).build();
+		BlockID endBlock = BlockID.newBuilder().setHeight(startHeight + count - 1).build();
+		BlockRange range = BlockRange.newBuilder().setStart(startBlock).setEnd(endBlock).build();
+
+		Iterator<CompactBlock> blocksIterator = this.getCompactTxStreamerStub().getBlockRange(range);
+
+		// Map from Iterator to List
+		List<CompactBlock> blocks = new ArrayList<>();
+		blocksIterator.forEachRemaining(blocks::add);
+
+		return blocks;
+	}
+
+	/**
+	 * Returns list of raw block headers, starting from <tt>startHeight</tt> inclusive.
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	@Override
+	public List<byte[]> getRawBlockHeaders(int startHeight, int count) throws ForeignBlockchainException {
+		BlockID startBlock = BlockID.newBuilder().setHeight(startHeight).build();
+		BlockID endBlock = BlockID.newBuilder().setHeight(startHeight + count - 1).build();
+		BlockRange range = BlockRange.newBuilder().setStart(startBlock).setEnd(endBlock).build();
+
+		Iterator<CompactBlock> blocks = this.getCompactTxStreamerStub().getBlockRange(range);
+
+		List<byte[]> rawBlockHeaders = new ArrayList<>();
+
+		while (blocks.hasNext()) {
+			CompactBlock block = blocks.next();
+
+			if (block.getHeader() == null) {
+				throw new ForeignBlockchainException.NetworkException("Unexpected output from Pirate Chain getBlockRange gRPC");
+			}
+
+			rawBlockHeaders.add(block.getHeader().toByteArray());
+		}
+
+		return rawBlockHeaders;
+	}
+
+	/**
+	 * Returns list of raw block timestamps, starting from <tt>startHeight</tt> inclusive.
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	@Override
+	public List<Long> getBlockTimestamps(int startHeight, int count) throws ForeignBlockchainException {
+		BlockID startBlock = BlockID.newBuilder().setHeight(startHeight).build();
+		BlockID endBlock = BlockID.newBuilder().setHeight(startHeight + count - 1).build();
+		BlockRange range = BlockRange.newBuilder().setStart(startBlock).setEnd(endBlock).build();
+
+		Iterator<CompactBlock> blocks = this.getCompactTxStreamerStub().getBlockRange(range);
+
+		List<Long> rawBlockTimestamps = new ArrayList<>();
+
+		while (blocks.hasNext()) {
+			CompactBlock block = blocks.next();
+
+			if (block.getTime() <= 0) {
+				throw new ForeignBlockchainException.NetworkException("Unexpected output from Pirate Chain getBlockRange gRPC");
+			}
+
+			rawBlockTimestamps.add(Long.valueOf(block.getTime()));
+		}
+
+		return rawBlockTimestamps;
+	}
+
+	/**
+	 * Returns confirmed balance, based on passed payment script.
+	 * <p>
+	 * @return confirmed balance, or zero if script unknown
+	 * @throws ForeignBlockchainException if there was an error
+	 */
+	@Override
+	public long getConfirmedBalance(byte[] script) throws ForeignBlockchainException {
+		throw new ForeignBlockchainException("getConfirmedBalance not yet implemented for Pirate Chain");
+	}
+
+	/**
+	 * Returns confirmed balance, based on passed base58 encoded address.
+	 * <p>
+	 * @return confirmed balance, or zero if address unknown
+	 * @throws ForeignBlockchainException if there was an error
+	 */
+	@Override
+	public long getConfirmedAddressBalance(String base58Address) throws ForeignBlockchainException {
+		AddressList addressList = AddressList.newBuilder().addAddresses(base58Address).build();
+		Balance balance = this.getCompactTxStreamerStub().getTaddressBalance(addressList);
+
+		if (!(balance instanceof Balance))
+			throw new ForeignBlockchainException.NetworkException("Unexpected output from Pirate Chain getConfirmedAddressBalance gRPC");
+
+		return balance.getValueZat();
+	}
+
+	/**
+	 * Returns list of unspent outputs pertaining to passed address.
+	 * <p>
+	 * @return list of unspent outputs, or empty list if address unknown
+	 * @throws ForeignBlockchainException if there was an error.
+	 */
+	@Override
+	public List<UnspentOutput> getUnspentOutputs(String address, boolean includeUnconfirmed) throws ForeignBlockchainException {
+		GetAddressUtxosArg getAddressUtxosArg = GetAddressUtxosArg.newBuilder().addAddresses(address).build();
+		GetAddressUtxosReplyList replyList = this.getCompactTxStreamerStub().getAddressUtxos(getAddressUtxosArg);
+
+		if (!(replyList instanceof GetAddressUtxosReplyList))
+			throw new ForeignBlockchainException.NetworkException("Unexpected output from Pirate Chain getUnspentOutputs gRPC");
+
+		List<GetAddressUtxosReply> unspentList = replyList.getAddressUtxosList();
+		if (unspentList == null)
+			throw new ForeignBlockchainException.NetworkException("Unexpected output from Pirate Chain getUnspentOutputs gRPC");
+
+		List<UnspentOutput> unspentOutputs = new ArrayList<>();
+		for (GetAddressUtxosReply unspent : unspentList) {
+
+			int height = (int)unspent.getHeight();
+			// We only want unspent outputs from confirmed transactions (and definitely not mempool duplicates with height 0)
+			if (!includeUnconfirmed && height <= 0)
+				continue;
+
+			byte[] txHash = unspent.getTxid().toByteArray();
+			int outputIndex = unspent.getIndex();
+			long value = unspent.getValueZat();
+			byte[] script = unspent.getScript().toByteArray();
+			String addressRes = unspent.getAddress();
+
+			unspentOutputs.add(new UnspentOutput(txHash, outputIndex, height, value, script, addressRes));
+		}
+
+		return unspentOutputs;
+	}
+
+	/**
+	 * Returns list of unspent outputs pertaining to passed payment script.
+	 * <p>
+	 * @return list of unspent outputs, or empty list if script unknown
+	 * @throws ForeignBlockchainException if there was an error.
+	 */
+	@Override
+	public List<UnspentOutput> getUnspentOutputs(byte[] script, boolean includeUnconfirmed) throws ForeignBlockchainException {
+		String address = this.blockchain.deriveP2shAddress(script);
+		return this.getUnspentOutputs(address, includeUnconfirmed);
+	}
+
+	/**
+	 * Returns raw transaction for passed transaction hash.
+	 * <p>
+	 * NOTE: Do not mutate returned byte[]!
+	 *
+	 * @throws ForeignBlockchainException.NotFoundException if transaction not found
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	@Override
+	public byte[] getRawTransaction(String txHash) throws ForeignBlockchainException {
+		return getRawTransaction(HashCode.fromString(txHash).asBytes());
+	}
+
+	/**
+	 * Returns raw transaction for passed transaction hash.
+	 * <p>
+	 * NOTE: Do not mutate returned byte[]!
+	 *
+	 * @throws ForeignBlockchainException.NotFoundException if transaction not found
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	@Override
+	public byte[] getRawTransaction(byte[] txHash) throws ForeignBlockchainException {
+		ByteString byteString = ByteString.copyFrom(txHash);
+		TxFilter txFilter = TxFilter.newBuilder().setHash(byteString).build();
+		RawTransaction rawTransaction = this.getCompactTxStreamerStub().getTransaction(txFilter);
+
+		if (!(rawTransaction instanceof RawTransaction))
+			throw new ForeignBlockchainException.NetworkException("Unexpected output from Pirate Chain getTransaction gRPC");
+
+		return rawTransaction.getData().toByteArray();
+	}
+
+	/**
+	 * Returns transaction info for passed transaction hash.
+	 * <p>
+	 * @throws ForeignBlockchainException.NotFoundException if transaction not found
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	@Override
+	public BitcoinyTransaction getTransaction(String txHash) throws ForeignBlockchainException {
+		// Check cache first
+		BitcoinyTransaction transaction = transactionCache.get(txHash);
+		if (transaction != null)
+			return transaction;
+
+		ByteString byteString = ByteString.copyFrom(HashCode.fromString(txHash).asBytes());
+		TxFilter txFilter = TxFilter.newBuilder().setHash(byteString).build();
+		RawTransaction rawTransaction = this.getCompactTxStreamerStub().getTransaction(txFilter);
+
+		if (!(rawTransaction instanceof RawTransaction))
+			throw new ForeignBlockchainException.NetworkException("Unexpected output from Pirate Chain getTransaction gRPC");
+
+		byte[] transactionData = rawTransaction.getData().toByteArray();
+		String transactionDataString = HashCode.fromBytes(transactionData).toString();
+
+		JSONParser parser = new JSONParser();
+		JSONObject transactionJson;
+		try {
+			transactionJson = (JSONObject) parser.parse(transactionDataString);
+		} catch (ParseException e) {
+			throw new ForeignBlockchainException.NetworkException("Expected JSON string from Pirate Chain getTransaction gRPC");
+		}
+
+		Object inputsObj = transactionJson.get("vin");
+		if (!(inputsObj instanceof JSONArray))
+			throw new ForeignBlockchainException.NetworkException("Expected JSONArray for 'vin' from Pirate Chain getTransaction gRPC");
+
+		Object outputsObj = transactionJson.get("vout");
+		if (!(outputsObj instanceof JSONArray))
+			throw new ForeignBlockchainException.NetworkException("Expected JSONArray for 'vout' from Pirate Chain getTransaction gRPC");
+
+		try {
+			int size = ((Long) transactionJson.get("size")).intValue();
+			int locktime = ((Long) transactionJson.get("locktime")).intValue();
+
+			// Timestamp might not be present, e.g. for unconfirmed transaction
+			Object timeObj = transactionJson.get("time");
+			Integer timestamp = timeObj != null
+					? ((Long) timeObj).intValue()
+					: null;
+
+			List<BitcoinyTransaction.Input> inputs = new ArrayList<>();
+			for (Object inputObj : (JSONArray) inputsObj) {
+				JSONObject inputJson = (JSONObject) inputObj;
+
+				String scriptSig = (String) ((JSONObject) inputJson.get("scriptSig")).get("hex");
+				int sequence = ((Long) inputJson.get("sequence")).intValue();
+				String outputTxHash = (String) inputJson.get("txid");
+				int outputVout = ((Long) inputJson.get("vout")).intValue();
+
+				inputs.add(new BitcoinyTransaction.Input(scriptSig, sequence, outputTxHash, outputVout));
+			}
+
+			List<BitcoinyTransaction.Output> outputs = new ArrayList<>();
+			for (Object outputObj : (JSONArray) outputsObj) {
+				JSONObject outputJson = (JSONObject) outputObj;
+
+				String scriptPubKey = (String) ((JSONObject) outputJson.get("scriptPubKey")).get("hex");
+				long value = BigDecimal.valueOf((Double) outputJson.get("value")).setScale(8).unscaledValue().longValue();
+
+				// address too, if present in the "addresses" array
+				List<String> addresses = null;
+				Object addressesObj = ((JSONObject) outputJson.get("scriptPubKey")).get("addresses");
+				if (addressesObj instanceof JSONArray) {
+					addresses = new ArrayList<>();
+					for (Object addressObj : (JSONArray) addressesObj) {
+						addresses.add((String) addressObj);
+					}
+				}
+
+				// some peers return a single "address" string
+				Object addressObj = ((JSONObject) outputJson.get("scriptPubKey")).get("address");
+				if (addressObj instanceof String) {
+					if (addresses == null) {
+						addresses = new ArrayList<>();
+					}
+					addresses.add((String) addressObj);
+				}
+
+				// For the purposes of Qortal we require all outputs to contain addresses
+				// Some servers omit this info, causing problems down the line with balance calculations
+				// Update: it turns out that they were just using a different key - "address" instead of "addresses"
+				// The code below can remain in place, just in case a peer returns a missing address in the future
+				if (addresses == null || addresses.isEmpty()) {
+					if (this.currentServer != null) {
+						this.uselessServers.add(this.currentServer);
+						this.closeServer(this.currentServer);
+					}
+					LOGGER.info("No output addresses returned for transaction {}", txHash);
+					throw new ForeignBlockchainException(String.format("No output addresses returned for transaction %s", txHash));
+				}
+
+				outputs.add(new BitcoinyTransaction.Output(scriptPubKey, value, addresses));
+			}
+
+			transaction = new BitcoinyTransaction(txHash, size, locktime, timestamp, inputs, outputs);
+
+			// Save into cache
+			transactionCache.put(txHash, transaction);
+
+			return transaction;
+		} catch (NullPointerException | ClassCastException e) {
+			// Unexpected / invalid response from ElectrumX server
+		}
+
+		throw new ForeignBlockchainException.NetworkException("Unexpected JSON format from Pirate Chain getTransaction gRPC");
+	}
+
+	/**
+	 * Returns list of transactions, relating to passed payment script.
+	 * <p>
+	 * @return list of related transactions, or empty list if script unknown
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	@Override
+	public List<TransactionHash> getAddressTransactions(byte[] script, boolean includeUnconfirmed) throws ForeignBlockchainException {
+		// FUTURE: implement this if needed. Probably not very useful for private blockchains.
+		throw new ForeignBlockchainException("getAddressTransactions not yet implemented for Pirate Chain");
+	}
+
+	@Override
+	public List<BitcoinyTransaction> getAddressBitcoinyTransactions(String address, boolean includeUnconfirmed) throws ForeignBlockchainException {
+		try {
+			// Firstly we need to get the latest block
+			int defaultBirthday = Settings.getInstance().getArrrDefaultBirthday();
+			BlockID endBlock = this.getCompactTxStreamerStub().getLatestBlock(null);
+			BlockID startBlock = BlockID.newBuilder().setHeight(defaultBirthday).build();
+			BlockRange blockRange = BlockRange.newBuilder().setStart(startBlock).setEnd(endBlock).build();
+
+			TransparentAddressBlockFilter blockFilter = TransparentAddressBlockFilter.newBuilder()
+					.setAddress(address)
+					.setRange(blockRange)
+					.build();
+			Iterator<Service.RawTransaction> transactionIterator = this.getCompactTxStreamerStub().getTaddressTxids(blockFilter);
+
+			// Map from Iterator to List
+			List<RawTransaction> rawTransactions = new ArrayList<>();
+			transactionIterator.forEachRemaining(rawTransactions::add);
+
+			List<BitcoinyTransaction> transactions = new ArrayList<>();
+
+			for (RawTransaction rawTransaction : rawTransactions) {
+
+				Long height = rawTransaction.getHeight();
+				if (!includeUnconfirmed && (height == null || height == 0))
+					// We only want confirmed transactions
+					continue;
+
+				byte[] transactionData = rawTransaction.getData().toByteArray();
+				String transactionDataHex = HashCode.fromBytes(transactionData).toString();
+				BitcoinyTransaction bitcoinyTransaction = PirateChain.deserializeRawTransaction(transactionDataHex);
+				bitcoinyTransaction.height = height.intValue();
+				transactions.add(bitcoinyTransaction);
+			}
+
+			return transactions;
+		}
+		catch (RuntimeException | TransformationException e) {
+			throw new ForeignBlockchainException(String.format("Unable to get transactions for address %s: %s", address, e.getMessage()));
+		}
+	}
+
+	/**
+	 * Broadcasts raw transaction to network.
+	 * <p>
+	 * @throws ForeignBlockchainException if error occurs
+	 */
+	@Override
+	public void broadcastTransaction(byte[] transactionBytes) throws ForeignBlockchainException {
+		ByteString byteString = ByteString.copyFrom(transactionBytes);
+		RawTransaction rawTransaction = RawTransaction.newBuilder().setData(byteString).build();
+		SendResponse sendResponse = this.getCompactTxStreamerStub().sendTransaction(rawTransaction);
+
+		if (!(sendResponse instanceof SendResponse))
+			throw new ForeignBlockchainException.NetworkException("Unexpected output from Pirate Chain broadcastTransaction gRPC");
+
+		if (sendResponse.getErrorCode() != 0)
+			throw new ForeignBlockchainException.NetworkException(String.format("Unexpected error code from Pirate Chain broadcastTransaction gRPC: %d", sendResponse.getErrorCode()));
+	}
+
+	// Class-private utility methods
+
+
+	/**
+	 * Performs RPC call, with automatic reconnection to different server if needed.
+	 * <p>
+	 * @return "result" object from within JSON output
+	 * @throws ForeignBlockchainException if server returns error or something goes wrong
+	 */
+	private CompactTxStreamerGrpc.CompactTxStreamerBlockingStub getCompactTxStreamerStub() throws ForeignBlockchainException {
+		synchronized (this.serverLock) {
+			if (this.remainingServers.isEmpty())
+				this.remainingServers.addAll(this.servers);
+
+			while (haveConnection()) {
+				// If we have more servers and the last one replied slowly, try another
+				if (!this.remainingServers.isEmpty()) {
+					long averageResponseTime = this.currentServer.averageResponseTime();
+					if (averageResponseTime > MAX_AVG_RESPONSE_TIME) {
+						LOGGER.info("Slow average response time {}ms from {} - trying another server...", averageResponseTime, this.currentServer.hostname);
+						this.closeServer();
+						continue;
+					}
+				}
+
+				return CompactTxStreamerGrpc.newBlockingStub(this.channel);
+
+//				// Didn't work, try another server...
+//				this.closeServer();
+			}
+
+			// Failed to perform RPC - maybe lack of servers?
+			LOGGER.info("Error: No connected Pirate Light servers when trying to make RPC call");
+			throw new ForeignBlockchainException.NetworkException("No connected Pirate Light servers when trying to make RPC call");
+		}
+	}
+
+	/** Returns true if we have, or create, a connection to an ElectrumX server. */
+	private boolean haveConnection() throws ForeignBlockchainException {
+		if (this.currentServer != null && this.channel != null && !this.channel.isShutdown())
+			return true;
+
+		while (!this.remainingServers.isEmpty()) {
+			Server server = this.remainingServers.remove(RANDOM.nextInt(this.remainingServers.size()));
+			LOGGER.trace(() -> String.format("Connecting to %s", server));
+
+			try {
+				this.channel = ManagedChannelBuilder.forAddress(server.hostname, server.port).build();
+
+				CompactTxStreamerGrpc.CompactTxStreamerBlockingStub stub = CompactTxStreamerGrpc.newBlockingStub(this.channel);
+				LightdInfo lightdInfo = stub.getLightdInfo(Empty.newBuilder().build());
+
+				if (lightdInfo == null || lightdInfo.getBlockHeight() <= 0)
+					continue;
+
+				// TODO: find a way to verify that the server is using the expected chain
+
+//				if (featuresJson == null || Double.valueOf((String) featuresJson.get("protocol_min")) < MIN_PROTOCOL_VERSION)
+//					continue;
+
+//				if (this.expectedGenesisHash != null && !((String) featuresJson.get("genesis_hash")).equals(this.expectedGenesisHash))
+//					continue;
+
+				LOGGER.debug(() -> String.format("Connected to %s", server));
+				this.currentServer = server;
+				return true;
+			} catch (Exception e) {
+				// Didn't work, try another server...
+				closeServer();
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	 * Closes connection to <tt>server</tt> if it is currently connected server.
+	 * @param server
+	 */
+	private void closeServer(Server server) {
+		synchronized (this.serverLock) {
+			if (this.currentServer == null || !this.currentServer.equals(server) || this.channel == null) {
+				return;
+			}
+
+			// Close the gRPC managed-channel if not shut down already.
+			if (!this.channel.isShutdown()) {
+				try {
+					this.channel.shutdown();
+					if (!this.channel.awaitTermination(10, TimeUnit.SECONDS)) {
+						LOGGER.warn("Timed out gracefully shutting down connection: {}. ", this.channel);
+					}
+				} catch (Exception e) {
+					LOGGER.error("Unexpected exception while waiting for channel termination", e);
+				}
+			}
+
+			// Forceful shut down if still not terminated.
+			if (!this.channel.isTerminated()) {
+				try {
+					this.channel.shutdownNow();
+					if (!this.channel.awaitTermination(15, TimeUnit.SECONDS)) {
+						LOGGER.warn("Timed out forcefully shutting down connection: {}. ", this.channel);
+					}
+				} catch (Exception e) {
+					LOGGER.error("Unexpected exception while waiting for channel termination", e);
+				}
+			}
+
+			this.channel = null;
+			this.currentServer = null;
+		}
+	}
+
+	/** Closes connection to currently connected server (if any). */
+	private void closeServer() {
+		synchronized (this.serverLock) {
+			this.closeServer(this.currentServer);
+		}
+	}
+
+}

src/main/java/org/qortal/crosschain/PirateWallet.java

@@ -0,0 +1,409 @@
+package org.qortal.crosschain;
+
+import com.rust.litewalletjni.LiteWalletJni;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.bouncycastle.util.encoders.Base64;
+import org.bouncycastle.util.encoders.DecoderException;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.qortal.controller.PirateChainWalletController;
+import org.qortal.crypto.Crypto;
+import org.qortal.settings.Settings;
+import org.qortal.utils.Base58;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Objects;
+import java.util.Random;
+
+public class PirateWallet {
+
+    protected static final Logger LOGGER = LogManager.getLogger(PirateWallet.class);
+
+    private byte[] entropyBytes;
+    private final boolean isNullSeedWallet;
+    private String seedPhrase;
+    private boolean ready = false;
+
+    private String params;
+    private String saplingOutput64;
+    private String saplingSpend64;
+
+    private final static String COIN_PARAMS_FILENAME = "coinparams.json";
+    private final static String SAPLING_OUTPUT_FILENAME = "saplingoutput_base64";
+    private final static String SAPLING_SPEND_FILENAME = "saplingspend_base64";
+
+    public PirateWallet(byte[] entropyBytes, boolean isNullSeedWallet) throws IOException {
+        this.entropyBytes = entropyBytes;
+        this.isNullSeedWallet = isNullSeedWallet;
+
+        Path libDirectory = PirateChainWalletController.getRustLibOuterDirectory();
+        if (!Files.exists(Paths.get(libDirectory.toString(), COIN_PARAMS_FILENAME))) {
+            return;
+        }
+
+        this.params = Files.readString(Paths.get(libDirectory.toString(), COIN_PARAMS_FILENAME));
+        this.saplingOutput64 = Files.readString(Paths.get(libDirectory.toString(), SAPLING_OUTPUT_FILENAME));
+        this.saplingSpend64 = Files.readString(Paths.get(libDirectory.toString(), SAPLING_SPEND_FILENAME));
+
+        this.ready = this.initialize();
+    }
+
+    private boolean initialize() {
+        try {
+            LiteWalletJni.initlogging();
+
+            if (this.entropyBytes == null) {
+                return false;
+            }
+
+            // Pick a random server
+            PirateLightClient.Server server = this.getRandomServer();
+            String serverUri = String.format("https://%s:%d/", server.hostname, server.port);
+
+            // Pirate library uses base64 encoding
+            String entropy64 = Base64.toBase64String(this.entropyBytes);
+
+            // Derive seed phrase from entropy bytes
+            String inputSeedResponse = LiteWalletJni.getseedphrasefromentropyb64(entropy64);
+            JSONObject inputSeedJson =  new JSONObject(inputSeedResponse);
+            String inputSeedPhrase = null;
+            if (inputSeedJson.has("seedPhrase")) {
+                inputSeedPhrase = inputSeedJson.getString("seedPhrase");
+            }
+
+            String wallet = this.load();
+            if (wallet == null) {
+                // Wallet doesn't exist, so create a new one
+
+                int birthday = Settings.getInstance().getArrrDefaultBirthday();
+                if (this.isNullSeedWallet) {
+                    try {
+                        // Attempt to set birthday to the current block for null seed wallets
+                        birthday = PirateChain.getInstance().blockchainProvider.getCurrentHeight();
+                    }
+                    catch (ForeignBlockchainException e) {
+                        // Use the default height
+                    }
+                }
+
+                // Initialize new wallet
+                String birthdayString = String.format("%d", birthday);
+                String outputSeedResponse = LiteWalletJni.initfromseed(serverUri, this.params, inputSeedPhrase, birthdayString, this.saplingOutput64, this.saplingSpend64); // Thread-safe.
+                JSONObject outputSeedJson =  new JSONObject(outputSeedResponse);
+                String outputSeedPhrase = null;
+                if (outputSeedJson.has("seed")) {
+                    outputSeedPhrase = outputSeedJson.getString("seed");
+                }
+
+                // Ensure seed phrase in response matches supplied seed phrase
+                if (inputSeedPhrase == null || !Objects.equals(inputSeedPhrase, outputSeedPhrase)) {
+                    LOGGER.info("Unable to initialize Pirate Chain wallet: seed phrases do not match, or are null");
+                    return false;
+                }
+
+                this.seedPhrase = outputSeedPhrase;
+
+            } else {
+                // Restore existing wallet
+                String response = LiteWalletJni.initfromb64(serverUri, params, wallet, saplingOutput64, saplingSpend64);
+                if (response != null && !response.contains("\"initalized\":true")) {
+                    LOGGER.info("Unable to initialize Pirate Chain wallet at {}: {}", serverUri, response);
+                    return false;
+                }
+                this.seedPhrase = inputSeedPhrase;
+            }
+
+            // Check that we're able to communicate with the library
+            Integer ourHeight = this.getHeight();
+            return (ourHeight != null && ourHeight > 0);
+
+        } catch (IOException | JSONException | UnsatisfiedLinkError e) {
+            LOGGER.info("Unable to initialize Pirate Chain wallet: {}", e.getMessage());
+        }
+
+        return false;
+    }
+
+    public boolean isReady() {
+        return this.ready;
+    }
+
+    public void setReady(boolean ready) {
+        this.ready = ready;
+    }
+
+    public boolean entropyBytesEqual(byte[] testEntropyBytes) {
+        return Arrays.equals(testEntropyBytes, this.entropyBytes);
+    }
+
+    private void encrypt() {
+        if (this.isEncrypted()) {
+            // Nothing to do
+            return;
+        }
+
+        String encryptionKey = this.getEncryptionKey();
+        if (encryptionKey == null) {
+            // Can't encrypt without a key
+            return;
+        }
+
+        this.doEncrypt(encryptionKey);
+    }
+
+    private void decrypt() {
+        if (!this.isEncrypted()) {
+            // Nothing to do
+            return;
+        }
+
+        String encryptionKey = this.getEncryptionKey();
+        if (encryptionKey == null) {
+            // Can't encrypt without a key
+            return;
+        }
+
+        this.doDecrypt(encryptionKey);
+    }
+
+    public void unlock() {
+        if (!this.isEncrypted()) {
+            // Nothing to do
+            return;
+        }
+
+        String encryptionKey = this.getEncryptionKey();
+        if (encryptionKey == null) {
+            // Can't encrypt without a key
+            return;
+        }
+
+        this.doUnlock(encryptionKey);
+    }
+
+    public boolean save() throws IOException {
+        if (!isInitialized()) {
+            LOGGER.info("Error: can't save wallet, because no wallet it initialized");
+            return false;
+        }
+        if (this.isNullSeedWallet()) {
+            // Don't save wallets that have a null seed
+            return false;
+        }
+
+        // Encrypt first (will do nothing if already encrypted)
+        this.encrypt();
+
+        String wallet64 = LiteWalletJni.save();
+        byte[] wallet;
+        try {
+            wallet = Base64.decode(wallet64);
+        }
+        catch (DecoderException e) {
+            LOGGER.info("Unable to decode wallet");
+            return false;
+        }
+        if (wallet == null) {
+            LOGGER.info("Unable to save wallet");
+            return false;
+        }
+
+        Path walletPath = this.getCurrentWalletPath();
+        Files.createDirectories(walletPath.getParent());
+        Files.write(walletPath, wallet, StandardOpenOption.CREATE);
+
+        LOGGER.debug("Saved Pirate Chain wallet");
+
+        return true;
+    }
+
+    public String load() throws IOException {
+        if (this.isNullSeedWallet()) {
+            // Don't load wallets that have a null seed
+            return null;
+        }
+        Path walletPath = this.getCurrentWalletPath();
+        if (!Files.exists(walletPath)) {
+            return null;
+        }
+        byte[] wallet = Files.readAllBytes(walletPath);
+        if (wallet == null) {
+            return null;
+        }
+        String wallet64 = Base64.toBase64String(wallet);
+        return wallet64;
+    }
+
+    private String getEntropyHash58() {
+        if (this.entropyBytes == null) {
+            return null;
+        }
+        byte[] entropyHash = Crypto.digest(this.entropyBytes);
+        return Base58.encode(entropyHash);
+    }
+
+    public String getSeedPhrase() {
+        return this.seedPhrase;
+    }
+
+    private String getEncryptionKey() {
+        if (this.entropyBytes == null) {
+            return null;
+        }
+
+        // Prefix the bytes with a (deterministic) string, to ensure that the resulting hash is different
+        String prefix = "ARRRWalletEncryption";
+
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        try {
+            outputStream.write(prefix.getBytes(StandardCharsets.UTF_8));
+            outputStream.write(this.entropyBytes);
+
+        } catch (IOException e) {
+            return null;
+        }
+
+        byte[] encryptionKeyHash = Crypto.digest(outputStream.toByteArray());
+        return Base58.encode(encryptionKeyHash);
+    }
+
+    private Path getCurrentWalletPath() {
+        String entropyHash58 = this.getEntropyHash58();
+        String filename = String.format("wallet-%s.dat", entropyHash58);
+        return Paths.get(Settings.getInstance().getWalletsPath(), "PirateChain", filename);
+    }
+
+    public boolean isInitialized() {
+        return this.entropyBytes != null && this.ready;
+    }
+
+    public boolean isSynchronized() {
+        Integer height = this.getHeight();
+        Integer chainTip = this.getChainTip();
+
+        if (height == null || chainTip == null) {
+            return false;
+        }
+
+        // Assume synchronized if within 2 blocks of the chain tip
+        return height >= (chainTip - 2);
+    }
+
+
+    // APIs
+
+    public Integer getHeight() {
+        String response = LiteWalletJni.execute("height", "");
+        JSONObject json = new JSONObject(response);
+        if (json.has("height")) {
+            return json.getInt("height");
+        }
+        return null;
+    }
+
+    public Integer getChainTip() {
+        String response = LiteWalletJni.execute("info", "");
+        JSONObject json = new JSONObject(response);
+        if (json.has("latest_block_height")) {
+            return json.getInt("latest_block_height");
+        }
+        return null;
+    }
+
+    public boolean isNullSeedWallet() {
+        return this.isNullSeedWallet;
+    }
+
+    public Boolean isEncrypted() {
+        String response = LiteWalletJni.execute("encryptionstatus", "");
+        JSONObject json = new JSONObject(response);
+        if (json.has("encrypted")) {
+            return json.getBoolean("encrypted");
+        }
+        return null;
+    }
+
+    public boolean doEncrypt(String key) {
+        String response = LiteWalletJni.execute("encrypt", key);
+        JSONObject json = new JSONObject(response);
+        String result = json.getString("result");
+        if (json.has("result")) {
+            return (Objects.equals(result, "success"));
+        }
+        return false;
+    }
+
+    public boolean doDecrypt(String key) {
+        String response = LiteWalletJni.execute("decrypt", key);
+        JSONObject json = new JSONObject(response);
+        String result = json.getString("result");
+        if (json.has("result")) {
+            return (Objects.equals(result, "success"));
+        }
+        return false;
+    }
+
+    public boolean doUnlock(String key) {
+        String response = LiteWalletJni.execute("unlock", key);
+        JSONObject json = new JSONObject(response);
+        String result = json.getString("result");
+        if (json.has("result")) {
+            return (Objects.equals(result, "success"));
+        }
+        return false;
+    }
+
+    public String getWalletAddress() {
+        // Get balance, which also contains wallet addresses
+        String response = LiteWalletJni.execute("balance", "");
+        JSONObject json = new JSONObject(response);
+        String address = null;
+
+        if (json.has("z_addresses")) {
+            JSONArray z_addresses = json.getJSONArray("z_addresses");
+
+            if (z_addresses != null && !z_addresses.isEmpty()) {
+                JSONObject firstAddress = z_addresses.getJSONObject(0);
+                if (firstAddress.has("address")) {
+                    address = firstAddress.getString("address");
+                }
+            }
+        }
+        return address;
+    }
+
+    public String getPrivateKey() {
+        String response = LiteWalletJni.execute("export", "");
+        JSONArray addressesJson = new JSONArray(response);
+        if (!addressesJson.isEmpty()) {
+            JSONObject addressJson = addressesJson.getJSONObject(0);
+            if (addressJson.has("private_key")) {
+                //String address = addressJson.getString("address");
+                String privateKey = addressJson.getString("private_key");
+                //String viewingKey = addressJson.getString("viewing_key");
+
+                return privateKey;
+            }
+        }
+        return null;
+    }
+
+    public PirateLightClient.Server getRandomServer() {
+        PirateChain.PirateChainNet pirateChainNet = Settings.getInstance().getPirateChainNet();
+        Collection<PirateLightClient.Server> servers = pirateChainNet.getServers();
+        Random random = new Random();
+        int index = random.nextInt(servers.size());
+        return (PirateLightClient.Server) servers.toArray()[index];
+    }
+
+}

src/main/java/org/qortal/crosschain/Ravencoin.java

@@ -138,6 +138,8 @@ public class Ravencoin extends Bitcoiny {
 			Context bitcoinjContext = new Context(ravencoinNet.getParams());
 
 			instance = new Ravencoin(ravencoinNet, electrumX, bitcoinjContext, CURRENCY_CODE);
+
+			electrumX.setBlockchain(instance);
 		}
 
 		return instance;

src/main/java/org/qortal/crosschain/SimpleTransaction.java

@@ -7,11 +7,12 @@ import java.util.List;
 @XmlAccessorType(XmlAccessType.FIELD)
 public class SimpleTransaction {
     private String txHash;
-    private Integer timestamp;
+    private Long timestamp;
     private long totalAmount;
     private long feeAmount;
     private List<Input> inputs;
     private List<Output> outputs;
+    private String memo;
 
 
     @XmlAccessorType(XmlAccessType.FIELD)
@@ -74,20 +75,21 @@ public class SimpleTransaction {
     public SimpleTransaction() {
     }
 
-    public SimpleTransaction(String txHash, Integer timestamp, long totalAmount, long feeAmount, List<Input> inputs, List<Output> outputs) {
+    public SimpleTransaction(String txHash, Long timestamp, long totalAmount, long feeAmount, List<Input> inputs, List<Output> outputs, String memo) {
         this.txHash = txHash;
         this.timestamp = timestamp;
         this.totalAmount = totalAmount;
         this.feeAmount = feeAmount;
         this.inputs = inputs;
         this.outputs = outputs;
+        this.memo = memo;
     }
 
     public String getTxHash() {
         return txHash;
     }
 
-    public Integer getTimestamp() {
+    public Long getTimestamp() {
         return timestamp;
     }
 

src/main/java/org/qortal/crosschain/SupportedBlockchain.java

@@ -29,7 +29,6 @@ public enum SupportedBlockchain {
 
 	LITECOIN(Arrays.asList(
 			Triple.valueOf(LitecoinACCTv1.NAME, LitecoinACCTv1.CODE_BYTES_HASH, LitecoinACCTv1::getInstance),
-			Triple.valueOf(LitecoinACCTv2.NAME, LitecoinACCTv2.CODE_BYTES_HASH, LitecoinACCTv2::getInstance),
 			Triple.valueOf(LitecoinACCTv3.NAME, LitecoinACCTv3.CODE_BYTES_HASH, LitecoinACCTv3::getInstance)
 		)) {
 		@Override
@@ -45,7 +44,6 @@ public enum SupportedBlockchain {
 
 	DOGECOIN(Arrays.asList(
 			Triple.valueOf(DogecoinACCTv1.NAME, DogecoinACCTv1.CODE_BYTES_HASH, DogecoinACCTv1::getInstance),
-			Triple.valueOf(DogecoinACCTv2.NAME, DogecoinACCTv2.CODE_BYTES_HASH, DogecoinACCTv2::getInstance),
 			Triple.valueOf(DogecoinACCTv3.NAME, DogecoinACCTv3.CODE_BYTES_HASH, DogecoinACCTv3::getInstance)
 		)) {
 		@Override
@@ -85,6 +83,20 @@ public enum SupportedBlockchain {
 		public ACCT getLatestAcct() {
 			return RavencoinACCTv3.getInstance();
 		}
+	},
+
+	PIRATECHAIN(Arrays.asList(
+			Triple.valueOf(PirateChainACCTv3.NAME, PirateChainACCTv3.CODE_BYTES_HASH, PirateChainACCTv3::getInstance)
+	)) {
+		@Override
+		public ForeignBlockchain getInstance() {
+			return PirateChain.getInstance();
+		}
+
+		@Override
+		public ACCT getLatestAcct() {
+			return PirateChainACCTv3.getInstance();
+		}
 	};
 
 	private static final Map<ByteArray, Supplier<ACCT>> supportedAcctsByCodeHash = Arrays.stream(SupportedBlockchain.values())

src/main/java/org/qortal/crosschain/UnspentOutput.java

@@ -7,10 +7,20 @@ public class UnspentOutput {
 	public final int height;
 	public final long value;
 
-	public UnspentOutput(byte[] hash, int index, int height, long value) {
+	// Optional fields returned by Pirate Light Client server
+	public final byte[] script;
+	public final String address;
+
+	public UnspentOutput(byte[] hash, int index, int height, long value, byte[] script, String address) {
 		this.hash = hash;
 		this.index = index;
 		this.height = height;
 		this.value = value;
+		this.script = script;
+		this.address = address;
+	}
+
+	public UnspentOutput(byte[] hash, int index, int height, long value) {
+		this(hash, index, height, value, null, null);
 	}
 }

src/main/java/org/qortal/crypto/BouncyCastle25519.java

@@ -1,99 +0,0 @@
-package org.qortal.crypto;
-
-import java.lang.reflect.Constructor;
-import java.lang.reflect.Field;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.util.Arrays;
-
-import org.bouncycastle.crypto.Digest;
-import org.bouncycastle.math.ec.rfc7748.X25519;
-import org.bouncycastle.math.ec.rfc7748.X25519Field;
-import org.bouncycastle.math.ec.rfc8032.Ed25519;
-
-/** Additions to BouncyCastle providing Ed25519 to X25519 key conversion. */
-public class BouncyCastle25519 {
-
-	private static final Class<?> pointAffineClass;
-	private static final Constructor<?> pointAffineCtor;
-	private static final Method decodePointVarMethod;
-	private static final Field yField;
-
-	static {
-		try {
-			Class<?> ed25519Class = Ed25519.class;
-			pointAffineClass = Arrays.stream(ed25519Class.getDeclaredClasses()).filter(clazz -> clazz.getSimpleName().equals("PointAffine")).findFirst().get();
-			if (pointAffineClass == null)
-				throw new ClassNotFoundException("Can't locate PointExt inner class inside Ed25519");
-
-			decodePointVarMethod = ed25519Class.getDeclaredMethod("decodePointVar", byte[].class, int.class, boolean.class, pointAffineClass);
-			decodePointVarMethod.setAccessible(true);
-
-			pointAffineCtor = pointAffineClass.getDeclaredConstructors()[0];
-			pointAffineCtor.setAccessible(true);
-
-			yField = pointAffineClass.getDeclaredField("y");
-			yField.setAccessible(true);
-		} catch (NoSuchMethodException | SecurityException | IllegalArgumentException | NoSuchFieldException | ClassNotFoundException e) {
-			throw new RuntimeException("Can't initialize BouncyCastle25519 shim", e);
-		}
-	}
-
-	private static int[] obtainYFromPublicKey(byte[] ed25519PublicKey) {
-		try {
-			Object pA = pointAffineCtor.newInstance();
-
-			Boolean result = (Boolean) decodePointVarMethod.invoke(null, ed25519PublicKey, 0, true, pA);
-			if (result == null || !result)
-				return null;
-
-			return (int[]) yField.get(pA);
-		} catch (SecurityException | InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
-			throw new RuntimeException("Can't reflect into BouncyCastle", e);
-		}
-	}
-
-	public static byte[] toX25519PublicKey(byte[] ed25519PublicKey) {
-		int[] one = new int[X25519Field.SIZE];
-		X25519Field.one(one);
-
-		int[] y = obtainYFromPublicKey(ed25519PublicKey);
-
-		int[] oneMinusY = new int[X25519Field.SIZE];
-		X25519Field.sub(one, y, oneMinusY);
-
-		int[] onePlusY = new int[X25519Field.SIZE];
-		X25519Field.add(one, y, onePlusY);
-
-		int[] oneMinusYInverted = new int[X25519Field.SIZE];
-		X25519Field.inv(oneMinusY, oneMinusYInverted);
-
-		int[] u = new int[X25519Field.SIZE];
-		X25519Field.mul(onePlusY, oneMinusYInverted, u);
-
-		X25519Field.normalize(u);
-
-		byte[] x25519PublicKey = new byte[X25519.SCALAR_SIZE];
-		X25519Field.encode(u, x25519PublicKey, 0);
-
-		return x25519PublicKey;
-	}
-
-	public static byte[] toX25519PrivateKey(byte[] ed25519PrivateKey) {
-		Digest d = Ed25519.createPrehash();
-		byte[] h = new byte[d.getDigestSize()];
-
-		d.update(ed25519PrivateKey, 0, ed25519PrivateKey.length);
-		d.doFinal(h, 0);
-
-		byte[] s = new byte[X25519.SCALAR_SIZE];
-
-		System.arraycopy(h, 0, s, 0, X25519.SCALAR_SIZE);
-		s[0] &= 0xF8;
-		s[X25519.SCALAR_SIZE - 1] &= 0x7F;
-		s[X25519.SCALAR_SIZE - 1] |= 0x40;
-
-		return s;
-	}
-
-}

src/main/java/org/qortal/crypto/Crypto.java

@@ -253,6 +253,10 @@ public abstract class Crypto {
 		return false;
 	}
 
+	public static byte[] toPublicKey(byte[] privateKey) {
+		return new Ed25519PrivateKeyParameters(privateKey, 0).generatePublicKey().getEncoded();
+	}
+
 	public static boolean verify(byte[] publicKey, byte[] signature, byte[] message) {
 		try {
 			return Ed25519.verify(signature, 0, publicKey, 0, message, 0, message.length);
@@ -264,16 +268,24 @@ public abstract class Crypto {
 	public static byte[] sign(Ed25519PrivateKeyParameters edPrivateKeyParams, byte[] message) {
 		byte[] signature = new byte[SIGNATURE_LENGTH];
 
-		edPrivateKeyParams.sign(Ed25519.Algorithm.Ed25519, edPrivateKeyParams.generatePublicKey(), null, message, 0, message.length, signature, 0);
+		edPrivateKeyParams.sign(Ed25519.Algorithm.Ed25519,null, message, 0, message.length, signature, 0);
+
+		return signature;
+	}
+
+	public static byte[] sign(byte[] privateKey, byte[] message) {
+		byte[] signature = new byte[SIGNATURE_LENGTH];
+
+		new Ed25519PrivateKeyParameters(privateKey, 0).sign(Ed25519.Algorithm.Ed25519,null, message, 0, message.length, signature, 0);
 
 		return signature;
 	}
 
 	public static byte[] getSharedSecret(byte[] privateKey, byte[] publicKey) {
-		byte[] x25519PrivateKey = BouncyCastle25519.toX25519PrivateKey(privateKey);
+		byte[] x25519PrivateKey = Qortal25519Extras.toX25519PrivateKey(privateKey);
 		X25519PrivateKeyParameters xPrivateKeyParams = new X25519PrivateKeyParameters(x25519PrivateKey, 0);
 
-		byte[] x25519PublicKey = BouncyCastle25519.toX25519PublicKey(publicKey);
+		byte[] x25519PublicKey = Qortal25519Extras.toX25519PublicKey(publicKey);
 		X25519PublicKeyParameters xPublicKeyParams = new X25519PublicKeyParameters(x25519PublicKey, 0);
 
 		byte[] sharedSecret = new byte[SHARED_SECRET_LENGTH];
@@ -281,5 +293,4 @@ public abstract class Crypto {
 
 		return sharedSecret;
 	}
-
 }

src/main/java/org/qortal/crypto/MemoryPoW.java

@@ -1,10 +1,44 @@
 package org.qortal.crypto;
 
+import org.qortal.utils.NTP;
+
 import java.nio.ByteBuffer;
+import java.util.concurrent.TimeoutException;
 
 public class MemoryPoW {
 
+	/**
+	 * Compute a MemoryPoW nonce
+	 *
+	 * @param data
+	 * @param workBufferLength
+	 * @param difficulty
+	 * @return
+	 * @throws TimeoutException
+	 */
 	public static Integer compute2(byte[] data, int workBufferLength, long difficulty) {
+		try {
+			return MemoryPoW.compute2(data, workBufferLength, difficulty, null);
+
+		} catch (TimeoutException e) {
+			// This won't happen, because above timeout is null
+			return null;
+		}
+	}
+
+	/**
+	 * Compute a MemoryPoW nonce, with optional timeout
+	 *
+	 * @param data
+	 * @param workBufferLength
+	 * @param difficulty
+	 * @param timeout maximum number of milliseconds to compute for before giving up,<br>or null if no timeout
+	 * @return
+	 * @throws TimeoutException
+	 */
+	public static Integer compute2(byte[] data, int workBufferLength, long difficulty, Long timeout) throws TimeoutException {
+		long startTime = NTP.getTime();
+
 		// Hash data with SHA256
 		byte[] hash = Crypto.digest(data);
 
@@ -33,6 +67,13 @@ public class MemoryPoW {
 			if (Thread.currentThread().isInterrupted())
 				return -1;
 
+			if (timeout != null) {
+				long now = NTP.getTime();
+				if (now > startTime + timeout) {
+					throw new TimeoutException("Timeout reached");
+				}
+			}
+
 			seed *= seedMultiplier; // per nonce
 
 			state[0] = longHash[0] ^ seed;
@@ -58,6 +99,10 @@ public class MemoryPoW {
 	}
 
 	public static boolean verify2(byte[] data, int workBufferLength, long difficulty, int nonce) {
+		return verify2(data, null, workBufferLength, difficulty, nonce);
+	}
+
+	public static boolean verify2(byte[] data, long[] workBuffer, int workBufferLength, long difficulty, int nonce) {
 		// Hash data with SHA256
 		byte[] hash = Crypto.digest(data);
 
@@ -70,7 +115,10 @@ public class MemoryPoW {
 		byteBuffer = null;
 
 		int longBufferLength = workBufferLength / 8;
-		long[] workBuffer = new long[longBufferLength];
+
+		if (workBuffer == null)
+			workBuffer = new long[longBufferLength];
+
 		long[] state = new long[4];
 
 		long seed = 8682522807148012L;

src/main/java/org/qortal/crypto/Qortal25519Extras.java

@@ -0,0 +1,234 @@
+package org.qortal.crypto;
+
+import org.bouncycastle.crypto.Digest;
+import org.bouncycastle.crypto.digests.SHA512Digest;
+import org.bouncycastle.math.ec.rfc7748.X25519;
+import org.bouncycastle.math.ec.rfc7748.X25519Field;
+import org.bouncycastle.math.ec.rfc8032.Ed25519;
+import org.bouncycastle.math.raw.Nat256;
+
+import java.security.SecureRandom;
+import java.util.Arrays;
+import java.util.Collection;
+
+/**
+ * Additions to BouncyCastle providing:
+ * <p></p>
+ * <ul>
+ *     <li>Ed25519 to X25519 key conversion</li>
+ *     <li>Aggregate public keys</li>
+ *     <li>Aggregate signatures</li>
+ * </ul>
+ */
+public abstract class Qortal25519Extras extends BouncyCastleEd25519 {
+
+	private static final SecureRandom SECURE_RANDOM = new SecureRandom();
+
+	public static byte[] toX25519PublicKey(byte[] ed25519PublicKey) {
+		int[] one = new int[X25519Field.SIZE];
+		X25519Field.one(one);
+
+		PointAffine pA = new PointAffine();
+		if (!decodePointVar(ed25519PublicKey, 0, true, pA))
+			return null;
+
+		int[] y = pA.y;
+
+		int[] oneMinusY = new int[X25519Field.SIZE];
+		X25519Field.sub(one, y, oneMinusY);
+
+		int[] onePlusY = new int[X25519Field.SIZE];
+		X25519Field.add(one, y, onePlusY);
+
+		int[] oneMinusYInverted = new int[X25519Field.SIZE];
+		X25519Field.inv(oneMinusY, oneMinusYInverted);
+
+		int[] u = new int[X25519Field.SIZE];
+		X25519Field.mul(onePlusY, oneMinusYInverted, u);
+
+		X25519Field.normalize(u);
+
+		byte[] x25519PublicKey = new byte[X25519.SCALAR_SIZE];
+		X25519Field.encode(u, x25519PublicKey, 0);
+
+		return x25519PublicKey;
+	}
+
+	public static byte[] toX25519PrivateKey(byte[] ed25519PrivateKey) {
+		Digest d = Ed25519.createPrehash();
+		byte[] h = new byte[d.getDigestSize()];
+
+		d.update(ed25519PrivateKey, 0, ed25519PrivateKey.length);
+		d.doFinal(h, 0);
+
+		byte[] s = new byte[X25519.SCALAR_SIZE];
+
+		System.arraycopy(h, 0, s, 0, X25519.SCALAR_SIZE);
+		s[0] &= 0xF8;
+		s[X25519.SCALAR_SIZE - 1] &= 0x7F;
+		s[X25519.SCALAR_SIZE - 1] |= 0x40;
+
+		return s;
+	}
+
+	// Mostly for test support
+	public static PointAccum newPointAccum() {
+		return new PointAccum();
+	}
+
+	public static byte[] aggregatePublicKeys(Collection<byte[]> publicKeys) {
+		PointAccum rAccum = null;
+
+		for (byte[] publicKey : publicKeys) {
+			PointAffine pA = new PointAffine();
+			if (!decodePointVar(publicKey, 0, false, pA))
+				// Failed to decode
+				return null;
+
+			if (rAccum == null) {
+				rAccum = new PointAccum();
+				pointCopy(pA, rAccum);
+			} else {
+				pointAdd(pointCopy(pA), rAccum);
+			}
+		}
+
+		byte[] publicKey = new byte[SCALAR_BYTES];
+		if (0 == encodePoint(rAccum, publicKey, 0))
+			// Failed to encode
+			return null;
+
+		return publicKey;
+	}
+
+	public static byte[] aggregateSignatures(Collection<byte[]> signatures) {
+		// Signatures are (R, s)
+		// R is a point
+		// s is a scalar
+		PointAccum rAccum = null;
+		int[] sAccum = new int[SCALAR_INTS];
+
+		byte[] rEncoded = new byte[POINT_BYTES];
+		int[] sPart = new int[SCALAR_INTS];
+		for (byte[] signature : signatures) {
+			System.arraycopy(signature,0, rEncoded, 0, rEncoded.length);
+
+			PointAffine pA = new PointAffine();
+			if (!decodePointVar(rEncoded, 0, false, pA))
+				// Failed to decode
+				return null;
+
+			if (rAccum == null) {
+				rAccum = new PointAccum();
+				pointCopy(pA, rAccum);
+
+				decode32(signature, rEncoded.length, sAccum, 0, SCALAR_INTS);
+			} else {
+				pointAdd(pointCopy(pA), rAccum);
+
+				decode32(signature, rEncoded.length, sPart, 0, SCALAR_INTS);
+				Nat256.addTo(sPart, sAccum);
+
+				// "mod L" on sAccum
+				if (Nat256.gte(sAccum, L))
+					Nat256.subFrom(L, sAccum);
+			}
+		}
+
+		byte[] signature = new byte[SIGNATURE_SIZE];
+		if (0 == encodePoint(rAccum, signature, 0))
+			// Failed to encode
+			return null;
+
+		for (int i = 0; i < sAccum.length; ++i) {
+			encode32(sAccum[i], signature, POINT_BYTES + i * 4);
+		}
+
+		return signature;
+	}
+
+	public static byte[] signForAggregation(byte[] privateKey, byte[] message) {
+		// Very similar to BouncyCastle's implementation except we use secure random nonce and different hash
+		Digest d = new SHA512Digest();
+		byte[] h = new byte[d.getDigestSize()];
+
+		d.reset();
+		d.update(privateKey, 0, privateKey.length);
+		d.doFinal(h, 0);
+
+		byte[] sH = new byte[SCALAR_BYTES];
+		pruneScalar(h, 0, sH);
+
+		byte[] publicKey = new byte[SCALAR_BYTES];
+		scalarMultBaseEncoded(sH, publicKey, 0);
+
+		byte[] rSeed = new byte[d.getDigestSize()];
+		SECURE_RANDOM.nextBytes(rSeed);
+
+		byte[] r = new byte[SCALAR_BYTES];
+		pruneScalar(rSeed, 0, r);
+
+		byte[] R = new byte[POINT_BYTES];
+		scalarMultBaseEncoded(r, R, 0);
+
+		d.reset();
+		d.update(message, 0, message.length);
+		d.doFinal(h, 0);
+		byte[] k = reduceScalar(h);
+
+		byte[] s = calculateS(r, k, sH);
+
+		byte[] signature = new byte[SIGNATURE_SIZE];
+		System.arraycopy(R, 0, signature, 0, POINT_BYTES);
+		System.arraycopy(s, 0, signature, POINT_BYTES, SCALAR_BYTES);
+
+		return signature;
+	}
+
+	public static boolean verifyAggregated(byte[] publicKey, byte[] signature, byte[] message) {
+		byte[] R = Arrays.copyOfRange(signature, 0, POINT_BYTES);
+
+		byte[] s = Arrays.copyOfRange(signature, POINT_BYTES, POINT_BYTES + SCALAR_BYTES);
+
+		if (!checkPointVar(R))
+			// R out of bounds
+			return false;
+
+		if (!checkScalarVar(s))
+			// s out of bounds
+			return false;
+
+		byte[] S = new byte[POINT_BYTES];
+		scalarMultBaseEncoded(s, S, 0);
+
+		PointAffine pA = new PointAffine();
+		if (!decodePointVar(publicKey, 0, true, pA))
+			// Failed to decode
+			return false;
+
+		Digest d = new SHA512Digest();
+		byte[] h = new byte[d.getDigestSize()];
+
+		d.update(message, 0, message.length);
+		d.doFinal(h, 0);
+
+		byte[] k = reduceScalar(h);
+
+		int[] nS = new int[SCALAR_INTS];
+		decodeScalar(s, 0, nS);
+
+		int[] nA = new int[SCALAR_INTS];
+		decodeScalar(k, 0, nA);
+
+		/*PointAccum*/
+		PointAccum pR = new PointAccum();
+		scalarMultStrausVar(nS, nA, pA, pR);
+
+		byte[] check = new byte[POINT_BYTES];
+		if (0 == encodePoint(pR, check, 0))
+			// Failed to encode
+			return false;
+
+		return Arrays.equals(check, R);
+	}
+}

src/main/java/org/qortal/data/account/AccountData.java

@@ -18,6 +18,7 @@ public class AccountData {
 	protected int level;
 	protected int blocksMinted;
 	protected int blocksMintedAdjustment;
+	protected int blocksMintedPenalty;
 
 	// Constructors
 
@@ -25,7 +26,7 @@ public class AccountData {
 	protected AccountData() {
 	}
 
-	public AccountData(String address, byte[] reference, byte[] publicKey, int defaultGroupId, int flags, int level, int blocksMinted, int blocksMintedAdjustment) {
+	public AccountData(String address, byte[] reference, byte[] publicKey, int defaultGroupId, int flags, int level, int blocksMinted, int blocksMintedAdjustment, int blocksMintedPenalty) {
 		this.address = address;
 		this.reference = reference;
 		this.publicKey = publicKey;
@@ -34,10 +35,11 @@ public class AccountData {
 		this.level = level;
 		this.blocksMinted = blocksMinted;
 		this.blocksMintedAdjustment = blocksMintedAdjustment;
+		this.blocksMintedPenalty = blocksMintedPenalty;
 	}
 
 	public AccountData(String address) {
-		this(address, null, null, Group.NO_GROUP, 0, 0, 0, 0);
+		this(address, null, null, Group.NO_GROUP, 0, 0, 0, 0, 0);
 	}
 
 	// Getters/Setters
@@ -102,6 +104,14 @@ public class AccountData {
 		this.blocksMintedAdjustment = blocksMintedAdjustment;
 	}
 
+	public int getBlocksMintedPenalty() {
+		return this.blocksMintedPenalty;
+	}
+
+	public void setBlocksMintedPenalty(int blocksMintedPenalty) {
+		this.blocksMintedPenalty = blocksMintedPenalty;
+	}
+
 	// Comparison
 
 	@Override

src/main/java/org/qortal/data/account/AccountPenaltyData.java

@@ -0,0 +1,52 @@
+package org.qortal.data.account;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+
+// All properties to be converted to JSON via JAXB
+@XmlAccessorType(XmlAccessType.FIELD)
+public class AccountPenaltyData {
+
+	// Properties
+	private String address;
+	private int blocksMintedPenalty;
+
+	// Constructors
+
+	// necessary for JAXB
+	protected AccountPenaltyData() {
+	}
+
+	public AccountPenaltyData(String address, int blocksMintedPenalty) {
+		this.address = address;
+		this.blocksMintedPenalty = blocksMintedPenalty;
+	}
+
+	// Getters/Setters
+
+	public String getAddress() {
+		return this.address;
+	}
+
+	public int getBlocksMintedPenalty() {
+		return this.blocksMintedPenalty;
+	}
+
+	public String toString() {
+		return String.format("%s has penalty %d", this.address, this.blocksMintedPenalty);
+	}
+
+	@Override
+	public boolean equals(Object b) {
+		if (!(b instanceof AccountPenaltyData))
+			return false;
+
+		return this.getAddress().equals(((AccountPenaltyData) b).getAddress());
+	}
+
+	@Override
+	public int hashCode() {
+		return address.hashCode();
+	}
+
+}

src/main/java/org/qortal/data/arbitrary/ArbitraryResourceMetadata.java

@@ -15,19 +15,24 @@ public class ArbitraryResourceMetadata {
     private List<String> tags;
     private Category category;
     private String categoryName;
+    private List<String> files;
 
     public ArbitraryResourceMetadata() {
     }
 
-    public ArbitraryResourceMetadata(String title, String description, List<String> tags, Category category) {
+    public ArbitraryResourceMetadata(String title, String description, List<String> tags, Category category, List<String> files) {
         this.title = title;
         this.description = description;
         this.tags = tags;
         this.category = category;
-        this.categoryName = category.getName();
+        this.files = files;
+
+        if (category != null) {
+            this.categoryName = category.getName();
+        }
     }
 
-    public static ArbitraryResourceMetadata fromTransactionMetadata(ArbitraryDataTransactionMetadata transactionMetadata) {
+    public static ArbitraryResourceMetadata fromTransactionMetadata(ArbitraryDataTransactionMetadata transactionMetadata, boolean includeFileList) {
         if (transactionMetadata == null) {
             return null;
         }
@@ -36,10 +41,20 @@ public class ArbitraryResourceMetadata {
         List<String> tags = transactionMetadata.getTags();
         Category category = transactionMetadata.getCategory();
 
-        if (title == null && description == null && tags == null && category == null) {
+        // We don't always want to include the file list as it can be too verbose
+        List<String> files = null;
+        if (includeFileList) {
+            files = transactionMetadata.getFiles();
+        }
+
+        if (title == null && description == null && tags == null && category == null && files == null) {
             return null;
         }
 
-        return new ArbitraryResourceMetadata(title, description, tags, category);
+        return new ArbitraryResourceMetadata(title, description, tags, category, files);
+    }
+
+    public List<String> getFiles() {
+        return this.files;
     }
 }

src/main/java/org/qortal/data/arbitrary/ArbitraryResourceStatus.java

@@ -26,6 +26,7 @@ public class ArbitraryResourceStatus {
         }
     }
 
+    private Status status;
     private String id;
     private String title;
     private String description;
@@ -37,6 +38,7 @@ public class ArbitraryResourceStatus {
     }
 
     public ArbitraryResourceStatus(Status status, Integer localChunkCount, Integer totalChunkCount) {
+        this.status = status;
         this.id = status.toString();
         this.title = status.title;
         this.description = status.description;
@@ -47,4 +49,20 @@ public class ArbitraryResourceStatus {
     public ArbitraryResourceStatus(Status status) {
         this(status, null, null);
     }
+
+    public Status getStatus() {
+        return this.status;
+    }
+
+    public String getTitle() {
+        return this.title;
+    }
+
+    public Integer getLocalChunkCount() {
+        return this.localChunkCount;
+    }
+
+    public Integer getTotalChunkCount() {
+        return this.totalChunkCount;
+    }
 }

src/main/java/org/qortal/data/block/BlockData.java

@@ -211,6 +211,14 @@ public class BlockData implements Serializable {
 		this.onlineAccountsSignatures = onlineAccountsSignatures;
 	}
 
+	public int getOnlineAccountsSignaturesCount() {
+		if (this.onlineAccountsSignatures != null && this.onlineAccountsSignatures.length > 0) {
+			// Blocks use a single online accounts signature, so there is no need for this to be dynamic
+			return 1;
+		}
+		return 0;
+	}
+
 	public boolean isTrimmed() {
 		long onlineAccountSignaturesTrimmedTimestamp = NTP.getTime() - BlockChain.getInstance().getOnlineAccountSignaturesMaxLifetime();
 		long currentTrimmableTimestamp = NTP.getTime() - Settings.getInstance().getAtStatesMaxLifetime();

src/main/java/org/qortal/data/block/BlockSummaryData.java

@@ -11,11 +11,12 @@ public class BlockSummaryData {
 	private int height;
 	private byte[] signature;
 	private byte[] minterPublicKey;
-	private int onlineAccountsCount;
 
 	// Optional, set during construction
+	private Integer onlineAccountsCount;
 	private Long timestamp;
 	private Integer transactionCount;
+	private byte[] reference;
 
 	// Optional, set after construction
 	private Integer minterLevel;
@@ -25,6 +26,15 @@ public class BlockSummaryData {
 	protected BlockSummaryData() {
 	}
 
+	/** Constructor typically populated with fields from HeightV2Message */
+	public BlockSummaryData(int height, byte[] signature, byte[] minterPublicKey, long timestamp) {
+		this.height = height;
+		this.signature = signature;
+		this.minterPublicKey = minterPublicKey;
+		this.timestamp = timestamp;
+	}
+
+	/** Constructor typically populated with fields from BlockSummariesMessage */
 	public BlockSummaryData(int height, byte[] signature, byte[] minterPublicKey, int onlineAccountsCount) {
 		this.height = height;
 		this.signature = signature;
@@ -32,13 +42,16 @@ public class BlockSummaryData {
 		this.onlineAccountsCount = onlineAccountsCount;
 	}
 
-	public BlockSummaryData(int height, byte[] signature, byte[] minterPublicKey, int onlineAccountsCount, long timestamp, int transactionCount) {
+	/** Constructor typically populated with fields from BlockSummariesV2Message */
+	public BlockSummaryData(int height, byte[] signature, byte[] minterPublicKey, Integer onlineAccountsCount,
+							Long timestamp, Integer transactionCount, byte[] reference) {
 		this.height = height;
 		this.signature = signature;
 		this.minterPublicKey = minterPublicKey;
 		this.onlineAccountsCount = onlineAccountsCount;
 		this.timestamp = timestamp;
 		this.transactionCount = transactionCount;
+		this.reference = reference;
 	}
 
 	public BlockSummaryData(BlockData blockData) {
@@ -49,6 +62,7 @@ public class BlockSummaryData {
 
 		this.timestamp = blockData.getTimestamp();
 		this.transactionCount = blockData.getTransactionCount();
+		this.reference = blockData.getReference();
 	}
 
 	// Getters / setters
@@ -65,7 +79,7 @@ public class BlockSummaryData {
 		return this.minterPublicKey;
 	}
 
-	public int getOnlineAccountsCount() {
+	public Integer getOnlineAccountsCount() {
 		return this.onlineAccountsCount;
 	}
 
@@ -77,6 +91,10 @@ public class BlockSummaryData {
 		return this.transactionCount;
 	}
 
+	public byte[] getReference() {
+		return this.reference;
+	}
+
 	public Integer getMinterLevel() {
 		return this.minterLevel;
 	}

src/main/java/org/qortal/data/block/CommonBlockData.java

@@ -1,7 +1,5 @@
 package org.qortal.data.block;
 
-import org.qortal.data.network.PeerChainTipData;
-
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import java.math.BigInteger;
@@ -14,14 +12,14 @@ public class CommonBlockData {
 	private BlockSummaryData commonBlockSummary = null;
 	private List<BlockSummaryData> blockSummariesAfterCommonBlock = null;
 	private BigInteger chainWeight = null;
-	private PeerChainTipData chainTipData = null;
+	private BlockSummaryData chainTipData = null;
 
 	// Constructors
 
 	protected CommonBlockData() {
 	}
 
-	public CommonBlockData(BlockSummaryData commonBlockSummary, PeerChainTipData chainTipData) {
+	public CommonBlockData(BlockSummaryData commonBlockSummary, BlockSummaryData chainTipData) {
 		this.commonBlockSummary = commonBlockSummary;
 		this.chainTipData = chainTipData;
 	}
@@ -49,7 +47,7 @@ public class CommonBlockData {
 		this.chainWeight = chainWeight;
 	}
 
-	public PeerChainTipData getChainTipData() {
+	public BlockSummaryData getChainTipData() {
 		return this.chainTipData;
 	}
 

src/main/java/org/qortal/data/chat/ChatMessage.java

@@ -27,6 +27,8 @@ public class ChatMessage {
 
 	private String recipientName;
 
+	private byte[] chatReference;
+
 	private byte[] data;
 
 	private boolean isText;
@@ -42,8 +44,8 @@ public class ChatMessage {
 
 	// For repository use
 	public ChatMessage(long timestamp, int txGroupId, byte[] reference, byte[] senderPublicKey, String sender,
-			String senderName, String recipient, String recipientName, byte[] data, boolean isText,
+			String senderName, String recipient, String recipientName, byte[] chatReference, byte[] data,
-			boolean isEncrypted, byte[] signature) {
+			boolean isText, boolean isEncrypted, byte[] signature) {
 		this.timestamp = timestamp;
 		this.txGroupId = txGroupId;
 		this.reference = reference;
@@ -52,6 +54,7 @@ public class ChatMessage {
 		this.senderName = senderName;
 		this.recipient = recipient;
 		this.recipientName = recipientName;
+		this.chatReference = chatReference;
 		this.data = data;
 		this.isText = isText;
 		this.isEncrypted = isEncrypted;
@@ -90,6 +93,10 @@ public class ChatMessage {
 		return this.recipientName;
 	}
 
+	public byte[] getChatReference() {
+		return this.chatReference;
+	}
+
 	public byte[] getData() {
 		return this.data;
 	}

src/main/java/org/qortal/data/network/OnlineAccountData.java

@@ -5,6 +5,7 @@ import java.util.Arrays;
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlTransient;
 
 import org.qortal.account.PublicKeyAccount;
 
@@ -15,6 +16,10 @@ public class OnlineAccountData {
 	protected long timestamp;
 	protected byte[] signature;
 	protected byte[] publicKey;
+	protected Integer nonce;
+
+	@XmlTransient
+	private int hash;
 
 	// Constructors
 
@@ -22,10 +27,15 @@ public class OnlineAccountData {
 	protected OnlineAccountData() {
 	}
 
-	public OnlineAccountData(long timestamp, byte[] signature, byte[] publicKey) {
+	public OnlineAccountData(long timestamp, byte[] signature, byte[] publicKey, Integer nonce) {
 		this.timestamp = timestamp;
 		this.signature = signature;
 		this.publicKey = publicKey;
+		this.nonce = nonce;
+	}
+
+	public OnlineAccountData(long timestamp, byte[] signature, byte[] publicKey) {
+		this(timestamp, signature, publicKey, null);
 	}
 
 	public long getTimestamp() {
@@ -40,6 +50,10 @@ public class OnlineAccountData {
 		return this.publicKey;
 	}
 
+	public Integer getNonce() {
+		return this.nonce;
+	}
+
 	// For JAXB
 	@XmlElement(name = "address")
 	protected String getAddress() {
@@ -62,20 +76,23 @@ public class OnlineAccountData {
 		if (otherOnlineAccountData.timestamp != this.timestamp)
 			return false;
 
-		// Signature more likely to be unique than public key
-		if (!Arrays.equals(otherOnlineAccountData.signature, this.signature))
-			return false;
-
 		if (!Arrays.equals(otherOnlineAccountData.publicKey, this.publicKey))
 			return false;
 
+		// We don't compare signature because it's not our remit to verify and newer aggregate signatures use random nonces
+
 		return true;
 	}
 
 	@Override
 	public int hashCode() {
-		// Pretty lazy implementation
+		int h = this.hash;
-		return (int) this.timestamp;
+		if (h == 0) {
+			this.hash = h = Long.hashCode(this.timestamp)
+					^ Arrays.hashCode(this.publicKey);
+			// We don't use signature because newer aggregate signatures use random nonces
+		}
+		return h;
 	}
 
 }

src/main/java/org/qortal/data/network/PeerChainTipData.java

@@ -1,37 +0,0 @@
-package org.qortal.data.network;
-
-public class PeerChainTipData {
-
-	/** Latest block height as reported by peer. */
-	private Integer lastHeight;
-	/** Latest block signature as reported by peer. */
-	private byte[] lastBlockSignature;
-	/** Latest block timestamp as reported by peer. */
-	private Long lastBlockTimestamp;
-	/** Latest block minter public key as reported by peer. */
-	private byte[] lastBlockMinter;
-
-	public PeerChainTipData(Integer lastHeight, byte[] lastBlockSignature, Long lastBlockTimestamp, byte[] lastBlockMinter) {
-		this.lastHeight = lastHeight;
-		this.lastBlockSignature = lastBlockSignature;
-		this.lastBlockTimestamp = lastBlockTimestamp;
-		this.lastBlockMinter = lastBlockMinter;
-	}
-
-	public Integer getLastHeight() {
-		return this.lastHeight;
-	}
-
-	public byte[] getLastBlockSignature() {
-		return this.lastBlockSignature;
-	}
-
-	public Long getLastBlockTimestamp() {
-		return this.lastBlockTimestamp;
-	}
-
-	public byte[] getLastBlockMinter() {
-		return this.lastBlockMinter;
-	}
-
-}