bitcoinutil

Commonly used bitcoin functions

install

npm install bitcoinutil --save

import

var bitcoinutil = require("bitcoinutil")

methods

bitcoinutil.isValidBitcoinAddress(address)

address: public key in base58 format returns: true for valid address

bitcoinutil.toAddress(publicKey, 'testnet') or bitcoinutil.toAddress()

publicKey: public key in base58 format returns : public key in hex format

bitcoinutil.addressFromPrivateKey(privateKey)

privateKey: in WIF format returns : address, privateKey and publicKey in an object

example

var priv = "L56nAFJCUMuAUF1zp8e4Bhdq8S25kcFD5YrLTnys3ha8QK65dj8P"
bitcoinutil.addressFromPrivateKey(priv)

result

{
    "address"   : "mjsXa5HBdemtrjFZeLUB1D3NetupVNxFyN",
    "privateKey": "L56nAFJCUMuAUF1zp8e4Bhdq8S25kcFD5YrLTnys3ha8QK65dj8P",
    "publicKey" : "03abeb481466887c35e046de4b504a029e03bd3a5e35b03c67fe7821f5fb515483"
}

bitcoinutil.makeRandom('testnet') or bitcoinutil.makeRandom()

generates random key and return address, privateKey and publicKey in an object

result

{
    "address"   : "mjsXa5HBdemtrjFZeLUB1D3NetupVNxFyN",
    "privateKey": "L56nAFJCUMuAUF1zp8e4Bhdq8S25kcFD5YrLTnys3ha8QK65dj8P",
    "publicKey" : "03abeb481466887c35e046de4b504a029e03bd3a5e35b03c67fe7821f5fb515483"
}

bitcoinutil.getMultisigAddress(m, publicKeys)

creates m of n multisig address from n public keys in hex format

example (2 of 2)

var publicKeys = ["035da95734281849a327dea6402bd9c19f49bdd5b04f1cbb3136512984ec7b8d34", "03abeb481466887c35e046de4b504a029e03bd3a5e35b03c67fe7821f5fb515483"]
bitcoinutil.getMultisigAddress(2, publicKeys)

result

{
    "address": "2N4htmodeibCZVtLKRX9EFg8RGL4xdifi6x",
    "redeem" : "5221035da95734281849a327dea6402bd9c19f49bdd5b04f1cbb3136512984ec7b8d342103abeb481466887c35e046de4b504a029e03bd3a5e35b03c67fe7821f5fb51548352ae"
}

bitcoinutil.sign(tx, privateKey, redeem, isIncomplete)

tx : transaction to be signed (required) privateKey : private key used for signing (required) redeem : if multisig/p2sh, redeem script is required isIncomplete: value is true if tx is partially built i.e. more signatures are needed

bitcoinutil.satoshify(btc)

converts btc to satoshi

bitcoinutil.btcfy(satoshi)

converts satoshi to btc

bitcoinutil.hash160(input)

returns ripemd160 of sha256(input)

bitcoinutil.hash256(input)

returns sha256 of sha256(input)

bitcoinutil.signMessage(privateKey, message)

privateKey : private key in wif format used for signing message : Message to be signed returns signature in base64 format

bitcoinutil.verifyMessage(address, signature, message)

address : bitcoin address of the private key used in signing the message signature : signature of message in base64 format message : Message signed result true or false

bitcoinutil.getTxIdFromHex(tx)

tx : bitcoin transaction string represented in hex format result txid as will be displayed on bitcoin network