Bitcoinjs howto - think
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npm
Examples (Note about Electrum support at the bottom)
varbitcoin=require('bitcoinjs-lib')// v4.x.xvarbitcoinMessage=require('bitcoinjs-message')
sign(message, privateKey, compressed[, network.messagePrefix, sigOptions])
- If you pass the sigOptions arg instead of messagePrefix it will dynamically replace.
- sigOptions contains two attributes
- should be one of or
- will be used to create non-deterministic signatures using the RFC6979 extra entropy parameter. R value reuse is not an issue.
Sign a Bitcoin message
varkeyPair=bitcoin.ECPair.fromWIF('L4rK1yDtCWekvXuE6oXD9jCYfFNV2cWRpVuPLBcCU2z8TrisoyY1')varprivateKey=keyPair.privateKeyvarmessage='This is an example of a signed message.'varsignature=bitcoinMessage.sign(message,privateKey,keyPair.compressed)console.log(signature.toString('base64'))// => 'H9L5yLFjti0QTHhPyFrZCT1V/MMnBtXKmoiKDZ78NDBjERki6ZTQZdSMCtkgoNmp17By9ItJr8o7ChX0XxY91nk='
To produce non-deterministic signatures you can pass an extra option to sign()
var{ randomBytes }=require('crypto')varkeyPair=bitcoin.ECPair.fromWIF('L4rK1yDtCWekvXuE6oXD9jCYfFNV2cWRpVuPLBcCU2z8TrisoyY1')varprivateKey=keyPair.privateKeyvarmessage='This is an example of a signed message.'varsignature=bitcoinMessage.sign(message,privateKey,keyPair.compressed,{extraEntropy: randomBytes(32)})console.log(signature.toString('base64'))// => different (but valid) signature each time
Sign a Bitcoin message (with segwit addresses)
// P2SH(P2WPKH) address 'p2sh(p2wpkh)'varsignature=bitcoinMessage.sign(message,privateKey,keyPair.compressed,{segwitType: 'p2sh(p2wpkh)'})console.log(signature.toString('base64'))// => 'I9L5yLFjti0QTHhPyFrZCT1V/MMnBtXKmoiKDZ78NDBjERki6ZTQZdSMCtkgoNmp17By9ItJr8o7ChX0XxY91nk='// P2WPKH address 'p2wpkh'varsignature=bitcoinMessage.sign(message,privateKey,keyPair.compressed,{segwitType: 'p2wpkh'})console.log(signature.toString('base64'))// => 'J9L5yLFjti0QTHhPyFrZCT1V/MMnBtXKmoiKDZ78NDBjERki6ZTQZdSMCtkgoNmp17By9ItJr8o7ChX0XxY91nk='
verify(message, address, signature[, network.messagePrefix, checkSegwitAlways])
Verify a Bitcoin message
varaddress='1F3sAm6ZtwLAUnj7d38pGFxtP3RVEvtsbV'console.log(bitcoinMessage.verify(message,address,signature))// => true
About Electrum segwit signature support
- For Signing: Use the non-segwit compressed signing parameters for both segwit types (p2sh-p2wpkh and p2wpkh)
- For Verifying: Pass the checkSegwitAlways argument as true. (messagePrefix should be set to null to default to Bitcoin messagePrefix)
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