diff --git a/lib/blockTemplate.js b/lib/blockTemplate.js
index 15c82fb..08e649d 100644
--- a/lib/blockTemplate.js
+++ b/lib/blockTemplate.js
@@ -24,6 +24,7 @@ var BlockTemplate = module.exports = function BlockTemplate(job, timestamp){
     this.targetBlob = job.targetBlob;
     this.target = bignum.fromBuffer(this.targetBlob);
     this.chainIndex = this.fromGroup * constants.GroupSize + this.toGroup;
+    this.height = job.height
 
     this.registerSubmit = function(nonce){
         if (submits.indexOf(nonce) === -1){
@@ -49,6 +50,7 @@ var BlockTemplate = module.exports = function BlockTemplate(job, timestamp){
                 toGroup: this.toGroup,
                 headerBlob: this.headerBlob.toString('hex'),
                 txsBlob: emptyTxsBlob,
+                height: this.height
             };
         }
         return this.jobParams;
diff --git a/lib/constants.js b/lib/constants.js
index bcb8e84..327cb56 100644
--- a/lib/constants.js
+++ b/lib/constants.js
@@ -1,5 +1,6 @@
 
 module.exports = Object.freeze({
+    MiningProtocolVersion: 0x01,
     JobsMessageType: 0x00,
     SubmitResultMessageType: 0x01,
     SubmitBlockMessageType: 0x00,
diff --git a/lib/daemon.js b/lib/daemon.js
index c0cf5f9..69e2626 100644
--- a/lib/daemon.js
+++ b/lib/daemon.js
@@ -48,11 +48,13 @@ function MinerClient(instance, logger){
 
     this.submit = function(block, callback){
         var blockSize = block.length;
-        var messageSize = 4 + 1 + blockSize; // encodedBlockSize(4 bytes) + messageType(1 byte)
-        var msgHeader = Buffer.alloc(9); // encodedMessageSize(4 bytes) + encodedBlockSize(4 bytes) + messageType(1 byte)
-        msgHeader.writeUInt32BE(messageSize);
-        msgHeader.writeUInt8(constants.SubmitBlockMessageType, 4);
-        msgHeader.writeUInt32BE(blockSize, 5);
+        var msgPrefixSize = 1 + 1 + 4; // version(1 byte) + messageType(1 byte) + encodedBlockSize(4 bytes)
+        var msgSize = msgPrefixSize + blockSize;
+        var msgHeader = Buffer.alloc(10); // encodedMessageSize(4 bytes) + msgPrefixSize
+        msgHeader.writeUInt32BE(msgSize);
+        msgHeader.writeUInt8(constants.MiningProtocolVersion, 4)
+        msgHeader.writeUInt8(constants.SubmitBlockMessageType, 5);
+        msgHeader.writeUInt32BE(blockSize, 6);
         var data = Buffer.concat([msgHeader, block]);
         client.write(data, callback);
     }
diff --git a/lib/messages.js b/lib/messages.js
index 6ce74b9..d59f36a 100644
--- a/lib/messages.js
+++ b/lib/messages.js
@@ -19,6 +19,7 @@ var jobParser = new Parser()
     .buffer('targetBlob', {
         'length': 'targetLength'
     })
+    .uint32('height')
     .saveOffset('dataLength');
 
 exports.parseMessage = function(buffer, callback){
@@ -31,8 +32,12 @@ exports.parseMessage = function(buffer, callback){
             callback(null, 0);
         }
         else {
-            var messageType = buffer.readUInt8(headerSize);
-            var startOffset = headerSize + 1; // 1 byte message type
+            var version = buffer.readUInt8(headerSize); // 1 byte version
+            if (version !== constants.MiningProtocolVersion) {
+                throw Error(`Invalid protocol version ${version}, expect ${constants.MiningProtocolVersion}`);
+            }
+            var messageType = buffer.readUInt8(headerSize + 1); // 1 byte message type
+            var startOffset = headerSize + 2;
             var endOffset = headerSize + bodyLength;
             var message = buffer.slice(startOffset, endOffset);
             var payload = parse(messageType, message);
@@ -72,11 +77,13 @@ function parseJobs(buffer){
 function parseSubmitResult(buffer){
     var fromGroup = buffer.readUInt32BE();
     var toGroup = buffer.readUInt32BE(4);
-    var result = buffer.readUInt8(8);
+    var blockHash = buffer.slice(8, 40)
+    var result = buffer.readUInt8(40);
     var succeed = result == 1;
     return {
         fromGroup: fromGroup,
         toGroup: toGroup,
+        blockHash: blockHash,
         succeed: succeed
     };
 }
diff --git a/lib/pool.js b/lib/pool.js
index a777b59..bd206a1 100644
--- a/lib/pool.js
+++ b/lib/pool.js
@@ -162,20 +162,21 @@ var pool = module.exports = function pool(config, logger){
                 break;
             case constants.SubmitResultMessageType:
                 var result = message.payload;
-                handleSubmitResult(result.fromGroup, result.toGroup, result.succeed);
+                handleSubmitResult(result);
                 break;
             default:
                 logger.error('Invalid message type: ' + message.type);
         }
     }
 
-    function handleSubmitResult(fromGroup, toGroup, succeed){
-        var chainIndex = chainIndexStr(fromGroup, toGroup);
-        if (succeed){
-            logger.info('Submit block succeed for chainIndex: ' + chainIndex);
+    function handleSubmitResult(result){
+        var chainIndex = chainIndexStr(result.fromGroup, result.toGroup);
+        var blockHashHex = result.blockHash.toString('hex');
+        if (result.succeed){
+            logger.info(`Submit block ${blockHashHex} succeed for chainIndex ${chainIndex}`);
         }
         else {
-            logger.error('Submit block failed for chainIndex: ' + chainIndex);
+            logger.error(`Submit block ${blockHashHex} failed for chainIndex ${chainIndex}`);
         }
     }