bitcoinjs-message

Examples

var bitcoin = require('bitcoinjs-lib') // v3.x.x
var bitcoinMessage = require('bitcoinjs-message')

sign(message, privateKey, compressed[, network.messagePrefix])

Sign a Bitcoin message

var keyPair = bitcoin.ECPair.fromWIF('5KYZdUEo39z3FPrtuX2QbbwGnNP5zTd7yyr2SC1j299sBCnWjss')
var privateKey = keyPair.d.toBuffer(32)
var message = 'This is an example of a signed message.'

var signature = bitcoinMessage.sign(message, privateKey, keyPair.compressed)
console.log(signature.toString('base64'))
// => 'G9L5yLFjti0QTHhPyFrZCT1V/MMnBtXKmoiKDZ78NDBjERki6ZTQZdSMCtkgoNmp17By9ItJr8o7ChX0XxY91nk='

To produce non-deterministic signatures you can pass an extra option to sign()

var {randomBytes} = require('crypto')
var keyPair = bitcoin.ECPair.fromWIF('5KYZdUEo39z3FPrtuX2QbbwGnNP5zTd7yyr2SC1j299sBCnWjss')
var privateKey = keyPair.d.toBuffer(32)
var message = 'This is an example of a signed message.'

var signature = bitcoinMessage.sign(message, privateKey, keyPair.compressed, {data: randomBytes(32)})
console.log(signature.toString('base64'))
// => different (but valid) signature each time

verify(message, address, signature[, network.messagePrefix])

Verify a Bitcoin message

var address = '1HZwkjkeaoZfTSaJxDw6aKkxp45agDiEzN'
var signature = 'HJLQlDWLyb1Ef8bQKEISzFbDAKctIlaqOpGbrk3YVtRsjmC61lpE5ErkPRUFtDKtx98vHFGUWlFhsh3DiW6N0rE'
var message = 'This is an example of a signed message.'

console.log(bitcoinMessage.verify(message, address, signature))
// => true

LICENSE MIT