diff --git a/Block.js b/Block.js
index aeda5f9..64ae287 100644
--- a/Block.js
+++ b/Block.js
@@ -67,6 +67,7 @@ Block.prototype.parse = function parse(parser, headerOnly) {
   for (var i = 0; i < txCount; i++) {
     var tx = new Transaction();
     tx.parse(parser);
+    tx.calcHash();
     this.txs.push(tx);
   }
 };
diff --git a/bitcore.js b/bitcore.js
index 3336406..79e8ffb 100644
--- a/bitcore.js
+++ b/bitcore.js
@@ -21,6 +21,7 @@ requireWhenAccessed('networks', './networks');
 requireWhenAccessed('util', './util/util');
 requireWhenAccessed('EncodedData', './util/EncodedData');
 requireWhenAccessed('VersionedData', './util/VersionedData');
+requireWhenAccessed('BinaryParser', './util/BinaryParser');
 requireWhenAccessed('Address', './Address');
 requireWhenAccessed('Opcode', './Opcode');
 requireWhenAccessed('Script', './Script');
diff --git a/test/data/blk86756-testnet.dat b/test/data/blk86756-testnet.dat
new file mode 100644
index 0000000..207abda
Binary files /dev/null and b/test/data/blk86756-testnet.dat differ
diff --git a/test/test.Block.js b/test/test.Block.js
index f159f43..7d366b1 100644
--- a/test/test.Block.js
+++ b/test/test.Block.js
@@ -4,9 +4,33 @@ var chai = chai || require('chai');
 var bitcore = bitcore || require('../bitcore');
 var should = chai.should();
 
+var testdata = testdata || require('./testdata');
 var BlockModule = bitcore.Block;
+var BinaryParser = bitcore.BinaryParser;
 var Block;
 
+
+var getBlock = function (onlyHeader) {
+
+  var testnetMagic = bitcore.networks.testnet.magic.toString('hex');
+
+  var b = new Block();
+  // this is block 86756 from testnet3
+  var p = new BinaryParser(testdata.dataRawBlock);
+
+
+  var magic = p.buffer(4).toString('hex');
+
+
+  if (magic !== testnetMagic )
+    throw new Error('CRITICAL ERROR: Magic number mismatch: ' +
+                    magic + ' : ' + testnetMagic);
+
+  p.word32le();
+  b.parse(p, onlyHeader);
+  return b;
+};
+
 describe('Block', function() {
   it('should initialze the main object', function() {
     should.exist(BlockModule);
@@ -16,9 +40,82 @@ describe('Block', function() {
     should.exist(Block);
   });
   it('should be able to create instance', function() {
-    var p = new Block();
-    should.exist(p);
+    var b = new Block();
+    should.exist(b);
   });
+
+  it('should be able to parse a block from hex', function() {
+    var b = getBlock();
+    should.exist(b);
+    should.exist(b.getHash());
+  });
+
+  it('should be able to check block contents', function() {
+    var b = getBlock();
+    should.exist(b.getHash());
+    b.checkHash().should.equal(true);
+    b.checkProofOfWork().should.equal(true);
+    b.checkProofOfWork().should.equal(true);
+    b.getWork().toString().should.equal('17180131332');
+    b.checkTimestamp().should.equal(true);
+
+  });
+  it('#checkBlock should be able to check block contents', function() {
+    var b = getBlock();
+    should.exist(b.getHash());
+    b.checkBlock().should.equal(true);
+  });
+
+
+  it('should be able to check Transactions', function() {
+    var b = getBlock();
+
+    b.checkTransactions(b.txs).should.equal(true);
+    b.checkTransactions.bind([]).should.throw();
+
+    b.getMerkleTree(b.txs).length.should.equal(45);
+    bitcore.buffertools.toHex(b.calcMerkleRoot(b.txs)).should.equal(bitcore.buffertools.toHex(b.merkle_root));
+
+    var coinbase = b.txs.shift;
+    b.checkTransactions.bind(b.txs).should.throw();
+
+    b.txs.push(coinbase);
+
+    b.checkTransactions.bind(b.txs).should.throw();
+
+  });
+ 
+  it('should be able to checkProofOfWork', function() {
+    var b = getBlock();
+
+    b.hash = bitcore.buffertools.reverse(new Buffer('000000000b99b16390660d79fcc138d2ad0c89a0d044c4201a02bdf1f61ffa11', 'hex'));
+    b.checkHash().should.equal(true);
+    b.checkProofOfWork().should.equal(true);
+
+    // wrong hash hash, ok proof of work
+    b.hash = bitcore.buffertools.reverse(new Buffer('000000000000016390660d79fcc138d2ad0c89a0d044c4201a02bdf1f61ffa11', 'hex'));
+    b.checkProofOfWork().should.equal(true);
+    b.checkHash().should.equal(false);
+
+
+    // wrong hash hash, wrong proof of work
+    b.hash = bitcore.buffertools.reverse(new Buffer('0000000bbb99b16390660d79fcc138d2ad0c89a0d044c4201a02bdf1f61ffa11', 'hex'));
+    b.checkHash().should.equal(false);
+    b.checkProofOfWork.bind().should.throw();
+  });
+
+  it('should be able to get components from blocks', function() {
+    var b = getBlock(true);
+
+    bitcore.util.formatHashFull(b.getHash()).should.equal('000000000b99b16390660d79fcc138d2ad0c89a0d044c4201a02bdf1f61ffa11');
+
+    bitcore.util.formatHashFull(b.getHeader()).should.equal('d6383bd51c3fffc051be10ce58e6d52d1eb00470ae1ab4d5a3375c0f51382c6f249fff84e9888286974cfc97000000003c35b5e70b13d5b938fef4e998a977c17bea978390273b7c50a9aa4b00000002');
+
+    bitcore.util.formatHashFull(b.merkle_root).should.equal('58e6d52d1eb00470ae1ab4d5a3375c0f51382c6f249fff84e9888286974cfc97');
+
+  });
+
+
 });
 
 
diff --git a/test/testdata.js b/test/testdata.js
index 3c7f3fd..a92fe41 100644
--- a/test/testdata.js
+++ b/test/testdata.js
@@ -30,3 +30,8 @@ module.exports.dataSigNonCanonical = dataSigNonCanonical;
 module.exports.dataBase58KeysValid = dataBase58KeysValid;
 module.exports.dataBase58KeysInvalid = dataBase58KeysInvalid;
 
+var fd = fs.openSync('test/data/blk86756-testnet.dat', 'r');
+var buffer = new Buffer(9000);
+fs.readSync(fd, buffer, 0, 9000, 0);
+module.exports.dataRawBlock = buffer;
+