diff --git a/dist/block.js b/dist/block.js
index b61b3b3..7ff856c 100644
--- a/dist/block.js
+++ b/dist/block.js
@@ -5,10 +5,12 @@ var _util = require('./util');
 var _transaction = require('./transaction');var _transaction2 = _interopRequireDefault(_transaction);function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { default: obj };}var
 
 Block = function () {
-  function Block(height) {var txs = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];(0, _classCallCheck3.default)(this, Block);
+  function Block(height, options) {(0, _classCallCheck3.default)(this, Block);var _ref =
+    options || {},timestamp = _ref.timestamp,txs = _ref.txs;
     this.height = height;
-    this.txList = txs;
-    this.txHashList = txs.map(function (tx) {return tx.hash();});
+    this.timestamp = timestamp;
+    this.txList = txs || [];
+    this.txHashList = this.txList.map(function (tx) {return tx.hash();});
     this.merkleTree = null;
   }(0, _createClass3.default)(Block, [{ key: 'addTx', value: function addTx(
 
@@ -60,13 +62,14 @@ Block = function () {
       * Returns raw block data size
       */ }, { key: 'getSize', value: function getSize()
     {
-      // 8 bytes height + for each tx( X bytes raw tx size + 4 bytes raw tx length )
-      return 8 + this.txList.reduce(function (s, tx) {return s += tx.getSize() + 4;}, 0);
+      // 8 bytes height + 4 bytes timestamp + for each tx( X bytes raw tx size + 4 bytes raw tx length )
+      return 12 + this.txList.reduce(function (s, tx) {return s += tx.getSize() + 4;}, 0);
     } }, { key: 'toJSON', value: function toJSON()
 
     {
       return {
         height: this.height,
+        timestamp: this.timestamp,
         txs: this.txList.map(function (tx) {return tx.toJSON();}) };
 
     } }, { key: 'toRaw',
@@ -79,6 +82,7 @@ Block = function () {
                          * Returns {Buffer} with raw serialized block bytes
                          *
                          * 8 bytes - height
+                         * 4 bytes - timestamp
                          * [
                          *  4 bytes - tx 1 length,
                          *  X bytes - tx 1 data,
@@ -92,7 +96,8 @@ Block = function () {
     {
       var payload = Buffer.alloc(this.getSize(), 0);
       (0, _util.writeUint64)(payload, this.height, 0);
-      var offset = 8,rawTx = void 0;
+      payload.writeUInt32BE(this.timestamp, 8);
+      var offset = 12,rawTx = void 0;
       this.txList.forEach(function (tx) {
         rawTx = tx.toRaw();
         (0, _assert2.default)(rawTx.length <= Math.pow(2, 32));
@@ -119,6 +124,7 @@ Block = function () {
 
 
 
+
     // Returns proof of block inclusion for given tx
     // [
     // 32b - blockHash
@@ -190,4 +196,4 @@ Block = function () {
 
       // Add slices with proofs and return
       return slices.concat(proofs);
-    } }], [{ key: 'fromJSON', value: function fromJSON(_ref) {var height = _ref.height,txs = _ref.txs;return new Block(height, txs.map(_transaction2.default.fromJSON));} }, { key: 'fromRaw', value: function fromRaw(buf) {var height = (0, _util.readUint64)(buf);var block = new Block(height);var offset = 8,txSize = void 0;while (offset < buf.length) {txSize = buf.readUInt32BE(offset);block.addTx(_transaction2.default.fromRaw(buf.slice(offset + 4, offset + 4 + txSize)));offset += txSize + 4;}return block;} }]);return Block;}();exports.default = Block;module.exports = exports['default'];
\ No newline at end of file
+    } }], [{ key: 'fromJSON', value: function fromJSON(_ref2) {var height = _ref2.height,timestamp = _ref2.timestamp,txs = _ref2.txs;return new Block(height, { timestamp: timestamp, txs: txs.map(_transaction2.default.fromJSON) });} }, { key: 'fromRaw', value: function fromRaw(buf) {var height = (0, _util.readUint64)(buf);var timestamp = buf.readUInt32BE(8);var block = new Block(height, { timestamp: timestamp });var offset = 12,txSize = void 0;while (offset < buf.length) {txSize = buf.readUInt32BE(offset);block.addTx(_transaction2.default.fromRaw(buf.slice(offset + 4, offset + 4 + txSize)));offset += txSize + 4;}return block;} }]);return Block;}();exports.default = Block;module.exports = exports['default'];
\ No newline at end of file
diff --git a/lib/block.js b/lib/block.js
index 4739382..80e1094 100644
--- a/lib/block.js
+++ b/lib/block.js
@@ -5,10 +5,12 @@ import { toHexString, writeUint64, readUint64 } from './util';
 import Tx from './transaction';
 
 export default class Block {
-  constructor(height, txs = []) {
+  constructor(height, options) {
+    const { timestamp, txs } = options || {};
     this.height = height;
-    this.txList = txs;
-    this.txHashList = txs.map(tx => tx.hash());
+    this.timestamp = timestamp;
+    this.txList = txs || [];
+    this.txHashList = this.txList.map(tx => tx.hash());
     this.merkleTree = null;
   }
 
@@ -60,25 +62,27 @@ export default class Block {
   * Returns raw block data size
   */
   getSize() {
-    // 8 bytes height + for each tx( X bytes raw tx size + 4 bytes raw tx length )
-    return 8 + this.txList.reduce((s, tx) => s += tx.getSize() + 4, 0);
+    // 8 bytes height + 4 bytes timestamp + for each tx( X bytes raw tx size + 4 bytes raw tx length )
+    return 12 + this.txList.reduce((s, tx) => s += tx.getSize() + 4, 0);
   }
 
   toJSON() {
     return {
       height: this.height,
+      timestamp: this.timestamp,
       txs: this.txList.map(tx => tx.toJSON())
     };
   }
 
-  static fromJSON({ height, txs }) {
-    return new Block(height, txs.map(Tx.fromJSON));
+  static fromJSON({ height, timestamp, txs }) {
+    return new Block(height, { timestamp, txs: txs.map(Tx.fromJSON) });
   }
 
   /*
   * Returns {Buffer} with raw serialized block bytes
   *
   * 8 bytes - height
+  * 4 bytes - timestamp
   * [
   *  4 bytes - tx 1 length,
   *  X bytes - tx 1 data,
@@ -92,7 +96,8 @@ export default class Block {
   toRaw() {
     const payload = Buffer.alloc(this.getSize(), 0);
     writeUint64(payload, this.height, 0);
-    let offset = 8, rawTx;
+    payload.writeUInt32BE(this.timestamp, 8);
+    let offset = 12, rawTx;
     this.txList.forEach(tx => {
       rawTx = tx.toRaw();
       assert(rawTx.length <= 2 ** 32);
@@ -109,8 +114,9 @@ export default class Block {
   */
   static fromRaw(buf) {
     const height = readUint64(buf);
-    const block = new Block(height);
-    let offset = 8, txSize;
+    const timestamp = buf.readUInt32BE(8);
+    const block = new Block(height, { timestamp });
+    let offset = 12, txSize;
     while (offset < buf.length) {
       txSize = buf.readUInt32BE(offset);
       block.addTx(Tx.fromRaw(buf.slice(offset + 4, offset + 4 + txSize)));
diff --git a/lib/block.spec.js b/lib/block.spec.js
index 7a4c2ec..78d5609 100644
--- a/lib/block.spec.js
+++ b/lib/block.spec.js
@@ -137,12 +137,15 @@ describe('blocks', () => {
 
     transfer.sign([PRIV]);
 
-    const block = new Block(height, [transfer]);
-
+    const block = new Block(height, {
+      timestamp: Math.round(Date.now() / 1000),
+      txs: [transfer]
+    });
     // toJSON
     const json = block.toJSON();
     expect(json).to.eql({
       height: 123000044,
+      timestamp: block.timestamp,
       txs: [transfer.toJSON()],
     });
     // fromJSON
diff --git a/package.json b/package.json
index 2ddc200..764aaef 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "parsec-lib",
-  "version": "0.2.1",
+  "version": "0.3.0",
   "description": "transaction and block implementation",
   "main": "dist/index.js",
   "keywords": [