SimpleTransaction.timestamp is now in milliseconds instead of seconds.

Should fix 1970 timestamp issue in UI for foreign transactions, and also maintains consistency with QORT wallet transactions.

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

@@ -375,7 +375,7 @@ 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();
@@ -455,7 +455,7 @@ 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();
@@ -537,7 +537,8 @@ 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);
 	}
 
 	/**

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

@@ -7,7 +7,7 @@ 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;
@@ -74,7 +74,7 @@ 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) {
         this.txHash = txHash;
         this.timestamp = timestamp;
         this.totalAmount = totalAmount;
@@ -87,7 +87,7 @@ public class SimpleTransaction {
         return txHash;
     }
 
-    public Integer getTimestamp() {
+    public Long getTimestamp() {
         return timestamp;
     }