bitcore_multisig_example.js

var _ = require('lodash')
var bitcore = require('bitcore') // 0.12.5

var network = bitcore.Networks.testnet
var totalKeys = 3
var requiredSignatures = 2

var rawPrivateKeys = [
  'cUTyK6kpESjzWRtvzb5KfenFB6PaGofwojkJMx68AQA6t2mQSKmV',
  'cVQS3PFi9t1XWXAH2fKs5xczmeXKb5v4ZbwJ8u7vPgK9Xjx9CDts',
  'cUoMsNvEeJGJpGwZNP3RRu9kYWHW4B2jTA3WPdnk9ZCMdtynJQDc'
]
// rawPrivateKeys = _.range(totalKeys).map(function () { return bitcore.PrivateKey(network).toWIF() })
var privateKeys = rawPrivateKeys.map(function (pk) { return bitcore.PrivateKey(pk) })
var publicKeys = privateKeys.map(function (pk) { return bitcore.PublicKey(pk) })

// multisig address
var address = bitcore.Address(publicKeys, requiredSignatures, network)

// get utxo from external source (chromanode, insight, blockr...)
var utxo = {
  txId: '9500bed37ae3deaec7357d67864a57e193b2f0c87906cd17f28a2b0218495879',
  outputIndex: 0,
  address: address.toString(),
  script: bitcore.Script(address).toHex(),
  satoshis: 129191578
}

// create tx
var txObj = bitcore.Transaction()
  .from(utxo, publicKeys, requiredSignatures)
  .to('n3E3sYxTwz4FCU3LdUnKiiG1PTcPC654Za', utxo.satoshis - 100000)
  .toObject()

// Alice sign tx
var sigAliceObj = bitcore.Transaction(txObj).getSignatures(privateKeys[0])[0]
console.log('Alice signature:', sigAliceObj.toObject())

// Bob sign tx
var sigBobObj = bitcore.Transaction(txObj).getSignatures(privateKeys[2])[0]
console.log('Bob signature:', sigBobObj.toObject())


// apply Alice and Bob signatures
var tx = bitcore.Transaction(txObj)
  .applySignature(sigAliceObj)
  .applySignature(sigBobObj)

console.log('tx is fully signed', tx.isFullySigned())
console.log('tx is valid', tx.verify()