var bitcoin = require("bitcoinjs-lib");

tx = new bitcoin.Transaction()

tx.addInput("44f730d44973366fb7dfea7291e5a0257a7ec1b2d568b3de524516e6efd2e111", 0)

tx.addOutput("1Gx9FCknxSsLfFDzFdn75Xgqx95sDp38ir", 15000)


//;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
key = bitcoin.ECKey.makeRandom()

// Print your private key (in WIF format)
console.log(key.toWIF())
// => Kxr9tQED9H44gCmp6HAdmemAzU3n84H3dGkuWTKvE23JgHMW8gct

// Print your public key (toString defaults to a Bitcoin address)
console.log(key.pub.getAddress().toString())
// => 14bZ7YWde4KdRb5YN7GYkToz3EHVCvRxkF
//;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


// Initialize a private key using WIF
key = bitcoin.ECKey.fromWIF("L1uyy5qTuGrVXrmrsvHWHgVzW9kKdrp27wBC7Vs6nZDTF2BRUVwy")

// Sign the first input with the new key
tx.sign(0, key)

// Print transaction serialized as hex
console.log("Serialized transaction:")
console.log(tx.toHex())
// => 0100000001313eb630b128102b60241ca895f1d0ffca21 ...

// You could now push the transaction onto the Bitcoin network manually (see https://blockchain.info/pushtx)