diff --git a/src/main/java/org/qortal/transaction/PresenceTransaction.java b/src/main/java/org/qortal/transaction/PresenceTransaction.java
index 755c31a5..4a2ba67a 100644
--- a/src/main/java/org/qortal/transaction/PresenceTransaction.java
+++ b/src/main/java/org/qortal/transaction/PresenceTransaction.java
@@ -6,10 +6,14 @@ import java.util.List;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.qortal.account.Account;
+import org.qortal.crosschain.BTCACCT;
 import org.qortal.crypto.Crypto;
 import org.qortal.crypto.MemoryPoW;
+import org.qortal.data.at.ATData;
+import org.qortal.data.crosschain.CrossChainTradeData;
 import org.qortal.data.transaction.PresenceTransactionData;
 import org.qortal.data.transaction.TransactionData;
+import org.qortal.data.transaction.PresenceTransactionData.PresenceType;
 import org.qortal.group.Group;
 import org.qortal.repository.DataException;
 import org.qortal.repository.Repository;
@@ -104,13 +108,32 @@ public class PresenceTransaction extends Transaction {
 		if (this.repository.getTransactionRepository().exists(this.presenceTransactionData.getSignature()))
 			return ValidationResult.INVALID_BUT_OK;
 
+		// We only support TRADE_BOT-type PRESENCE at this time
+		if (PresenceType.TRADE_BOT != this.presenceTransactionData.getPresenceType())
+			return ValidationResult.NOT_YET_RELEASED;
+
 		// Check timestamp signature
 		byte[] timestampSignature = this.presenceTransactionData.getTimestampSignature();
 		byte[] timestampBytes = Longs.toByteArray(this.presenceTransactionData.getTimestamp());
 		if (!Crypto.verify(this.transactionData.getCreatorPublicKey(), timestampSignature, timestampBytes))
 			return ValidationResult.INVALID_TIMESTAMP_SIGNATURE;
 
-		return ValidationResult.OK;
+		// Check signer is known trade address
+		String signerAddress = Crypto.toAddress(this.transactionData.getCreatorPublicKey());
+
+		byte[] codeHash = BTCACCT.CODE_BYTES_HASH;
+		boolean isExecutable = true;
+
+		List<ATData> atsData = repository.getATRepository().getATsByFunctionality(codeHash, isExecutable, null, null, null);
+
+		for (ATData atData : atsData) {
+			CrossChainTradeData crossChainTradeData = BTCACCT.populateTradeData(repository, atData);
+
+			if (crossChainTradeData.qortalCreatorTradeAddress.equals(signerAddress))
+				return ValidationResult.OK;
+		}
+
+		return ValidationResult.AT_UNKNOWN;
 	}
 
 	@Override
diff --git a/src/test/java/org/qortal/test/PresenceTests.java b/src/test/java/org/qortal/test/PresenceTests.java
index 96cdc98c..228a543b 100644
--- a/src/test/java/org/qortal/test/PresenceTests.java
+++ b/src/test/java/org/qortal/test/PresenceTests.java
@@ -4,18 +4,25 @@ import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.qortal.account.PrivateKeyAccount;
+import org.qortal.asset.Asset;
+import org.qortal.crosschain.BTCACCT;
 import org.qortal.data.transaction.BaseTransactionData;
+import org.qortal.data.transaction.DeployAtTransactionData;
 import org.qortal.data.transaction.PresenceTransactionData;
+import org.qortal.data.transaction.TransactionData;
 import org.qortal.data.transaction.PresenceTransactionData.PresenceType;
 import org.qortal.group.Group;
 import org.qortal.repository.DataException;
 import org.qortal.repository.Repository;
 import org.qortal.repository.RepositoryManager;
+import org.qortal.test.common.BlockUtils;
 import org.qortal.test.common.Common;
 import org.qortal.test.common.TransactionUtils;
+import org.qortal.transaction.DeployAtTransaction;
 import org.qortal.transaction.PresenceTransaction;
 import org.qortal.transaction.Transaction;
 import org.qortal.transaction.Transaction.ValidationResult;
+import org.qortal.utils.NTP;
 
 import com.google.common.primitives.Longs;
 
@@ -23,6 +30,9 @@ import static org.junit.Assert.*;
 
 public class PresenceTests extends Common {
 
+	private static final byte[] BITCOIN_PKH = new byte[20];
+	private static final byte[] HASH_OF_SECRET_B = new byte[32];
+
 	private PrivateKeyAccount signer;
 	private Repository repository;
 
@@ -32,6 +42,31 @@ public class PresenceTests extends Common {
 
 		this.repository = RepositoryManager.getRepository();
 		this.signer = Common.getTestAccount(this.repository, "bob");
+
+		// We need to create corresponding test trade offer
+		byte[] creationBytes = BTCACCT.buildQortalAT(this.signer.getAddress(), BITCOIN_PKH, HASH_OF_SECRET_B,
+				0L, 0L,
+				7 * 24 * 60 * 60);
+
+		long txTimestamp = NTP.getTime();
+		byte[] lastReference = this.signer.getLastReference();
+
+		long fee = 0;
+		String name = "QORT-BTC cross-chain trade";
+		String description = "Qortal-Bitcoin cross-chain trade";
+		String atType = "ACCT";
+		String tags = "QORT-BTC ACCT";
+
+		BaseTransactionData baseTransactionData = new BaseTransactionData(txTimestamp, Group.NO_GROUP, lastReference, this.signer.getPublicKey(), fee, null);
+		TransactionData deployAtTransactionData = new DeployAtTransactionData(baseTransactionData, name, description, atType, tags, creationBytes, 1L, Asset.QORT);
+
+		Transaction deployAtTransaction = new DeployAtTransaction(repository, deployAtTransactionData);
+
+		fee = deployAtTransaction.calcRecommendedFee();
+		deployAtTransactionData.setFee(fee);
+
+		TransactionUtils.signAndImportValid(this.repository, deployAtTransactionData, this.signer);
+		BlockUtils.mintBlock(this.repository);
 	}
 
 	@After
@@ -50,6 +85,9 @@ public class PresenceTests extends Common {
 		byte[] timestampSignature = this.signer.sign(timestampBytes);
 
 		assertTrue(isValid(Group.NO_GROUP, this.signer, timestamp, timestampSignature));
+
+		PrivateKeyAccount nonTrader = Common.getTestAccount(repository, "alice");
+		assertFalse(isValid(Group.NO_GROUP, nonTrader, timestamp, timestampSignature));
 	}
 
 	@Test
@@ -87,7 +125,7 @@ public class PresenceTests extends Common {
 			timestampSignature = this.signer.sign(Longs.toByteArray(timestamp));
 
 		BaseTransactionData baseTransactionData = new BaseTransactionData(timestamp, txGroupId, reference, creatorPublicKey, fee, null);
-		PresenceTransactionData transactionData = new PresenceTransactionData(baseTransactionData, nonce, PresenceType.REWARD_SHARE, timestampSignature);
+		PresenceTransactionData transactionData = new PresenceTransactionData(baseTransactionData, nonce, PresenceType.TRADE_BOT, timestampSignature);
 
 		return new PresenceTransaction(this.repository, transactionData);
 	}