Added new DTO to store the data

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

@@ -0,0 +1,32 @@
+package org.qortal.crosschain;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+
+@XmlAccessorType(XmlAccessType.FIELD)
+public class SimpleTransaction {
+    private String txHash;
+    private Integer timestamp;
+    private long totalAmount;
+
+    public SimpleTransaction() {
+    }
+
+    public SimpleTransaction(String txHash, Integer timestamp, long totalAmount) {
+        this.txHash = txHash;
+        this.timestamp = timestamp;
+        this.totalAmount = totalAmount;
+    }
+
+    public String getTxHash() {
+        return txHash;
+    }
+
+    public Integer getTimestamp() {
+        return timestamp;
+    }
+
+    public long getTotalAmount() {
+        return totalAmount;
+    }
+}