bitcoin-utility-belt/src/transaction.js

Bitcoin Utility Belt is a client-side Bitcoin JavaScript library

// import libs
let bitcoin = require("bitcoinjs-lib");
let wallet = require("./wallet");
let fetch = require("node-fetch");
let request = require('request');

let create = (txInfo = [], testnet = false) => {

  // check network: bitcoin or testnet
  let network;
  if(testnet){
    network = bitcoin.networks.testnet;
  }else{
    network = bitcoin.networks.bitcoin;
  }

  var txb = new bitcoin.TransactionBuilder(network);
  //txb.setVersion(1);

  let i;
  let inputsTx = [];
  for(i = 0; i < txInfo.length; i++){
    let keyPair = bitcoin.ECPair.fromWIF(txInfo[i].privateKey);

    // add all inputs to an array
    let j;
    for(j = 0; j < txInfo[i].inputs.length; j++){
      inputsTx.push({
        hash: txInfo[i].inputs[j].inputHash,
        vout: txInfo[i].inputs[j].vout,
        keyPair: keyPair
      });
    }

    // add outputs
    let m;
    for(m = 0; m < txInfo[i].outputs.length; m++){
      txb.addOutput(txInfo[i].outputs[m].address, txInfo[i].outputs[m].value); 
    }
  }

  // adding all inputs at once
  for(i = 0; i < inputsTx.length; i++){
    txb.addInput(inputsTx[i].hash, inputsTx[i].vout);  
  }

  // sign all inputs with their own key pairs
  for(i = 0; i < inputsTx.length; i++){
    txb.sign(i, inputsTx[i].keyPair);
  }

  return txb.build().toHex();
};


let txInfo = [
  {
    privateKey: 'L1Knwj9W3qK3qMKdTvmg3VfzUs3ij2LETTFhxza9LfD5dngnoLG1',
    inputs: [
      {
        inputHash: "b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c",
        vout: 6
      }
    ],
    outputs: [
      {
        address: "1CUNEBjYrCn2y1SdiUMohaKUi4wpP326Lb",
        value:  180000
      }
    ]
  },
  {
    privateKey: 'KwcN2pT3wnRAurhy7qMczzbkpY5nXMW2ubh696UBc1bcwctTx26z',
    inputs: [
      {
        inputHash: "7d865e959b2466918c9863afca942d0fb89d7c9ac0c99bafc3749504ded97730",
        vout: 0
      }
    ],
    outputs: [
      {
        address: "1JtK9CQw1syfWj1WtFMWomrYdV3W2tWBF9",
        value:  170000
      }
    ]
  }
];
//console.log(create(txInfo));

let faucet = (address, amount, token) => {
  var data = {address: address, amount: amount};
  request.post(
    {
      url:'https://api.blockcypher.com/v1/btc/test3/faucet?token='+token,
      form: JSON.stringify(data)
    }, function(err,httpResponse,body){
      console.log(body);
    }
  );
};