Multisig transaction

transaction.js

'use strict'

const fs = require('fs');
const assert = require('assert');
const bcoin = require('bcoin');

const KeyRing = bcoin.wallet.WalletKey;
const Script = bcoin.Script;
const MTX = bcoin.MTX;
const Amount = bcoin.Amount;
const Coin = bcoin.Coin;


const privateKey1 = fs.readFileSync('regtest-key1.wif').toString();
const privateKey2 = fs.readFileSync('regtest-key2.wif').toString();

const keyPair1 = KeyRing.fromSecret(privateKey1);
const keyPair2 = KeyRing.fromSecret(privateKey2);

const publicKey1 = keyPair1.publicKey;
const publicKey2 = keyPair2.publicKey;

const m = 2;
const n = 2;

const redeem = Script.fromMultisig(m, n, [publicKey1, publicKey2]);
// P2SH
const script = Script.fromScripthash(redeem.hash160());
console.log(script);

const txInfo = {
  value: Amount.fromBTC('50').toValue(),
  hash: '7e8f41f9762095be300505d9a864fef44f5d11e29aa3e1dfb078271270044db1',
  index: 0
}

const coin = Coin.fromJSON({
  version: 1,
  height: -1,
  value: txInfo.value,
  coinbase: false,
  script: script.toJSON(),
  hash: txInfo.hash,
  index: txInfo.index
})

const tx = new MTX();

tx.addOutput({
  address: 'bcrt1qsv0eakq6j7785gjtvqacvwpeu4svc0zza7kecr',
  value: Amount.fromBTC('25').toValue(),
})

tx.addOutput({
  address: 'bcrt1qjrteh4yns38heymd49w72rwhy2nh24phs862ly', // changeAddress
  value: Amount.fromBTC('24.99').toValue()
})

tx.addCoin(coin);

keyPair1.script = redeem;
keyPair2.script = redeem;

tx.scriptInput(0, coin, keyPair1);
tx.signInput(0, coin, keyPair1);
tx.signInput(0, coin, keyPair2);

assert(tx.verify(), 'TX is invalid');

const raw = tx.toRaw();
console.log(raw.toString('hex'));
//console.log(tx);