Added API call POST /crosschain/btc/send for sending Bitcoin

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

@@ -0,0 +1,25 @@
+package org.qortal.api.model;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+@XmlAccessorType(XmlAccessType.FIELD)
+public class BitcoinSendRequest {
+
+	@Schema(description = "Bitcoin BIP32 extended private key", example = "tprv8ZgxMBicQKsPdahhFSrCdvC1bsWyzHHZfTneTVqUXN6s1wEtZLwAkZXzFP6TbTVGajEB55L1HYLg2aQMecZLXLre5YJcawpdFG66STVAWPJ")
+	public String xprv58;
+
+	@Schema(description = "Recipient's Bitcoin address ('legacy' P2PKH only)", example = "1BitcoinEaterAddressDontSendf59kuE")
+	public String receivingAddress;
+
+	@Schema(description = "Amount of BTC to send")
+	@XmlJavaTypeAdapter(value = org.qortal.api.AmountTypeAdapter.class)
+	public long bitcoinAmount;
+
+	public BitcoinSendRequest() {
+	}
+
+}

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

@@ -27,7 +27,7 @@ public class TradeBotCreateRequest {
 	@Schema(description = "Suggested trade timeout (minutes)", example = "10080")
 	public int tradeTimeout;
 
-	@Schema(description = "Bitcoin address for receiving", example = "1NCTG9oLk41bU6pcehLNo9DVJup77EHAVx")
+	@Schema(description = "Bitcoin address for receiving", example = "1BitcoinEaterAddressDontSendf59kuE")
 	public String receivingAddress;
 
 	public TradeBotCreateRequest() {

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

@@ -46,6 +46,7 @@ import org.qortal.api.model.CrossChainTradeRequest;
 import org.qortal.api.model.CrossChainTradeSummary;
 import org.qortal.api.model.TradeBotCreateRequest;
 import org.qortal.api.model.TradeBotRespondRequest;
+import org.qortal.api.model.BitcoinSendRequest;
 import org.qortal.api.model.CrossChainBitcoinP2SHStatus;
 import org.qortal.api.model.CrossChainBitcoinRedeemRequest;
 import org.qortal.api.model.CrossChainBitcoinRefundRequest;
@@ -947,6 +948,57 @@ public class CrossChainResource {
 		return balance.toString();
 	}
 
+	@POST
+	@Path("/btc/send")
+	@Operation(
+		summary = "Sends BTC from BIP32 wallet to specific address",
+		description = "Currently only supports 'legacy' P2PKH Bitcoin addresses. Supply BIP32 'm' private key in base58, starting with 'xprv' for mainnet, 'tprv' for testnet",
+		requestBody = @RequestBody(
+			required = true,
+			content = @Content(
+				mediaType = MediaType.APPLICATION_JSON,
+				schema = @Schema(
+					implementation = BitcoinSendRequest.class
+				)
+			)
+		),
+		responses = {
+			@ApiResponse(
+				content = @Content(mediaType = MediaType.TEXT_PLAIN, schema = @Schema(type = "string"))
+			)
+		}
+	)
+	@ApiErrors({ApiError.INVALID_PRIVATE_KEY, ApiError.INVALID_CRITERIA, ApiError.INVALID_ADDRESS, ApiError.BTC_BALANCE_ISSUE, ApiError.BTC_NETWORK_ISSUE})
+	public String sendBitcoin(BitcoinSendRequest bitcoinSendRequest) {
+		Security.checkApiCallAllowed(request);
+
+		if (bitcoinSendRequest.bitcoinAmount <= 0)
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_CRITERIA);
+
+		Address receivingAddress;
+		try {
+			receivingAddress = Address.fromString(BTC.getInstance().getNetworkParameters(), bitcoinSendRequest.receivingAddress);
+		} catch (AddressFormatException e) {
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_ADDRESS);
+		}
+
+		// We only support P2PKH addresses at this time
+		if (receivingAddress.getOutputScriptType() != ScriptType.P2PKH)
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_ADDRESS);
+
+		if (!BTC.getInstance().isValidXprv(bitcoinSendRequest.xprv58))
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.INVALID_PRIVATE_KEY);
+
+		org.bitcoinj.core.Transaction spendTransaction = BTC.getInstance().buildSpend(bitcoinSendRequest.xprv58, bitcoinSendRequest.receivingAddress, bitcoinSendRequest.bitcoinAmount);
+		if (spendTransaction == null)
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.BTC_BALANCE_ISSUE);
+
+		if (!BTC.getInstance().broadcastTransaction(spendTransaction))
+			throw ApiExceptionFactory.INSTANCE.createException(request, ApiError.BTC_NETWORK_ISSUE);
+
+		return "true";
+	}
+
 	@GET
 	@Path("/tradebot")
 	@Operation(