diff --git a/contracts/javascore/cluster-connection/src/main/java/xcall/adapter/cluster/ClusterConnection.java b/contracts/javascore/cluster-connection/src/main/java/xcall/adapter/cluster/ClusterConnection.java
index b5aacbc7..aff298dd 100644
--- a/contracts/javascore/cluster-connection/src/main/java/xcall/adapter/cluster/ClusterConnection.java
+++ b/contracts/javascore/cluster-connection/src/main/java/xcall/adapter/cluster/ClusterConnection.java
@@ -359,14 +359,8 @@ private void OnlyAdmin() {
      * @return the hash of the message
      */
     private byte[] getMessageHash(String srcNetwork, BigInteger _connSn, byte[] msg, String dstNetwork) {
-        ByteArrayObjectWriter writer = Context.newByteArrayObjectWriter("RLPn");
-        writer.beginList(4);
-        writer.write(srcNetwork);
-        writer.write(_connSn);
-        writer.write(msg);
-        writer.write(dstNetwork);
-        writer.end();
-        return Context.hash("keccak-256", writer.toByteArray());
+        String message = srcNetwork + String.valueOf(_connSn) + bytesToHex(msg) + dstNetwork;
+        return Context.hash("keccak-256", message.getBytes());
     }
 
 }
\ No newline at end of file
diff --git a/contracts/javascore/cluster-connection/src/test/java/xcall/adapter/cluster/ClusterConnectionTest.java b/contracts/javascore/cluster-connection/src/test/java/xcall/adapter/cluster/ClusterConnectionTest.java
index 28c691e4..6e29a92f 100644
--- a/contracts/javascore/cluster-connection/src/test/java/xcall/adapter/cluster/ClusterConnectionTest.java
+++ b/contracts/javascore/cluster-connection/src/test/java/xcall/adapter/cluster/ClusterConnectionTest.java
@@ -238,15 +238,21 @@ public void testRecvMessageWithSignaturesNotEnoughValidSignatures() throws Excep
         assertEquals("Reverted(0): Not enough valid signatures", e.getMessage());
     }
 
-    public static byte[] getMessageHash(String srcNetwork, BigInteger _connSn, byte[] msg, String dstNetwork) {
-        ByteArrayObjectWriter writer = Context.newByteArrayObjectWriter("RLPn");
-        writer.beginList(4);
-        writer.write(srcNetwork);
-        writer.write(_connSn);
-        writer.write(msg);
-        writer.write(dstNetwork);
-        writer.end();
-        return Context.hash("keccak-256", writer.toByteArray());
+    private byte[] getMessageHash(String srcNetwork, BigInteger _connSn, byte[] msg, String dstNetwork) {
+        String message = srcNetwork + String.valueOf(_connSn) + bytesToHex(msg) + dstNetwork;
+        return Context.hash("keccak-256", message.getBytes());
+    }
+
+    private String bytesToHex(byte[] bytes) {
+        StringBuilder hexString = new StringBuilder();
+        for (byte b : bytes) {
+            String hex = Integer.toHexString(0xff & b); // Mask with 0xff to handle negative values correctly
+            if (hex.length() == 1) {
+                hexString.append('0'); // Add a leading zero if hex length is 1
+            }
+            hexString.append(hex);
+        }
+        return hexString.toString();
     }
 
     @Test
@@ -262,4 +268,5 @@ public void testAddSigners() throws Exception {
         assertEquals(signers.length, 2);
     }
 
+
 }
\ No newline at end of file