I am running this code and nothing happens.

I am trying to hash160 a script with OP_HASH160 {scriptHash} OP_EQUAL and get a P2SH address as output but not sure this is the right script to achieve this.

// OP_HASH160 {scriptHash} OP_EQUAL
var bitcoin = require('bitcoinjs-lib')
var bscript = require('./src/script')
var types = require('./src/types')
var typeforce = require('typeforce')
var OPS = require('bitcoin-ops')

function check (script) {
  var buffer = bscript.compile(script)

  return buffer.length === 23 &&
    buffer[0] === OPS.OP_HASH160 &&
    buffer[1] === 0x14 &&
    buffer[22] === OPS.OP_EQUAL
check.toJSON = function () { return 'scriptHash output' }

function encode (scriptHash) {
  typeforce(types.Hash160bit, scriptHash)

  return bscript.compile([OPS.OP_HASH160, f1b914051eaabf34c22d354053698e512b36, OPS.OP_EQUAL])

function decode (buffer) {
  typeforce(check, buffer)

  return buffer.slice(2, 22)

module.exports = {
  check: check,
  decode: decode,
  encode: encode

What am I doing wrong? Thanks


You don't hash the OP_HASH160 {scriptHash} OP_EQUAL, that's just a template associated with P2SH addresses. You need to hash the redeem script, add version byte and checksum and then encode into base58.

Sample Python code:

def p2sh(script):
    scripthash = hash160(script)
    data = b'\x05' + scripthash
    checksum = sha256(sha256(data))[:4]
    address = data + checksum
    return base58.encode(address)
  • Thanks! I tried to run your code but nothing happens. How can I get the address and the private key from that string? I'm new to python. i.imgur.com/uPKt09A.png – RobertH Jun 19 '18 at 23:40
  • try cloning this repository, it's where I got it from. From the cloned project folder open python and run the following snippet: bpaste.net/show/82cda4df9253 You can't get the private key from anything, it is something you must have. To get an address from a privatekey try this bpaste.net/show/7c224235cebe – Mike D Jun 20 '18 at 8:28

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