bitcoin_example.js

const bitcoin = require('bitcoinjs-lib');

module.exports = function example() {
  const keyPair = bitcoin.ECPair.fromWIF(
    'L1uyy5qTuGrVXrmrsvHWHgVzW9kKdrp27wBC7Vs6nZDTF2BRUVwy'
  );
  const tx = new bitcoin.TransactionBuilder();

  tx.addInput(
    'aa94ab02c182214f090e99a0d57021caffd0f195a81c24602b1028b130b63e31',
    0
  );
  tx.addOutput('1Gokm82v6DmtwKEB8AiVhm82hyFSsEvBDK', 15000);
  tx.sign(0, keyPair);

  const expected = '0100000001313eb630b128102b60241ca895f1d0ffca2170d5a0990e094f2182c102ab94aa000000006b483045022100aefbcf847900b01dd3e3debe054d3b6d03d715d50aea8525f5ea3396f168a1fb022013d181d05b15b90111808b22ef4f9ebe701caf2ab48db269691fdf4e9048f4f60121029f50f51d63b345039a290c94bffd3180c99ed659ff6ea6b1242bca47eb93b59fffffffff01983a0000000000001976a914ad618cf4333b3b248f9744e8e81db2964d0ae39788ac00000000';
  const actual = tx.build().toHex();

  return new Promise((resolve) => {
    process.nextTick(() => {
      resolve(actual === expected);
    });
  });
};