add Transaction signature verify example

test/integration/transactions.js

@@ -216,4 +216,26 @@ describe('bitcoinjs-lib (transactions)', function () {
       })
     })
   })
+
+  it('can verify Transaction signatures', function () {
+    var txHex = '010000000321c5f7e7bc98b3feda84aad36a5c99a02bcb8823a2f3eccbcd5da209698b5c20000000006b48304502210099e021772830207cf7c55b69948d3b16b4dcbf1f55a9cd80ebf8221a169735f9022064d33f11d62cd28240b3862afc0b901adc9f231c7124dd19bdb30367b61964c50121032b4c06c06c3ec0b7fa29519dfa5aae193ee2cc35ca127f29f14ec605d62fb63dffffffff8a75ce85441ddb3f342708ee33cc8ed418b07d9ba9e0e7c4e1cccfe9f52d8a88000000006946304302207916c23dae212c95a920423902fa44e939fb3d542f4478a7b46e9cde53705800021f0d74e9504146e404c1b8f9cba4dff2d4782e3075491c9ed07ce4a7d1c4461a01210216c92abe433106491bdeb4a261226f20f5a4ac86220cc6e37655aac6bf3c1f2affffffffdfef93f69fe32e944fad79fa8f882b3a155d80383252348caba1a77a5abbf7ef000000006b483045022100faa6e9ca289b46c64764a624c59ac30d9abcf1d4a04c4de9089e67cbe0d300a502206930afa683f6807502de5c2431bf9a1fd333c8a2910a76304df0f3d23d83443f0121039e05da8b8ea4f9868ecebb25998c7701542986233f4401799551fbecf316b18fffffffff01ff4b0000000000001976a9146c86476d1d85cd60116cd122a274e6a570a5a35c88acc96d0700'
+    var keyPairs = [
+      '032b4c06c06c3ec0b7fa29519dfa5aae193ee2cc35ca127f29f14ec605d62fb63d',
+      '0216c92abe433106491bdeb4a261226f20f5a4ac86220cc6e37655aac6bf3c1f2a',
+      '039e05da8b8ea4f9868ecebb25998c7701542986233f4401799551fbecf316b18f'
+    ].map(function (q) { return bitcoin.ECPair.fromPublicKeyBuffer(Buffer.from(q, 'hex')) })
+
+    var tx = bitcoin.Transaction.fromHex(txHex)
+
+    tx.ins.forEach(function (input, i) {
+      var keyPair = keyPairs[i]
+      var prevOutScript = bitcoin.address.toOutputScript(keyPair.getAddress())
+      var scriptSig = bitcoin.script.pubKeyHash.input.decode(input.script)
+      var ss = bitcoin.ECSignature.parseScriptSignature(scriptSig.signature)
+      var hash = tx.hashForSignature(i, prevOutScript, ss.hashType)
+
+      assert.strictEqual(keyPair.getPublicKeyBuffer().toString('hex'), scriptSig.pubKey.toString('hex'))
+      assert.strictEqual(keyPair.verify(hash, ss.signature), true)
+    })
+  })
 })