bitcoinjs-lib hdwallet

階層的決定性ウォレット
この記事はbitcoinjs-lib@4系です
バージョン３系と後方互換性がなくなっています

v3との簡単な違い

モジュールの名前空間変更　HDNode -> bip32
address取得方法の変更
bip32周りのメソッド名の変更

install

npm i bip39 bitcoinjs-lib

mnemonic generate

12 word

const mnemonic = bip39.generateMnemonic();

24 word

const mnemonic = bip39.generateMnemonic(256);

mnemonic to masternode

const mnemonicToM = (mnemonic, password, network) => {
    const seed = bip39.mnemonicToSeed(mnemonic, password || "")
    const m = bitcoin.bip32.fromSeed(seed, bitcoin.networks[network || "bitcoin"])
    return m
}

master extended private key

m.toBase58()

extended private key

m.deriveHardened(44).deriveHardened(0).deriveHardened(0).toBase58()

m.derivePath("m/44'/0'/0'").toBase58()

extended public key

m.deriveHardened(44).deriveHardened(0).deriveHardened(0).neutered().toBase58()

m.derivePath("m/44'/0'/0'").neutered().toBase58()

bitcoin address

address

address生成用のラッパーを作ったほうが楽です

const getAddress = (node) => {
    return bitcoin.payments.p2pkh({ pubkey: node.publicKey }).address
}
getAddress(m.derivePath("m/44'/0'/0'/0/0"))

private key

m.derivePath("m/44'/0'/0'/0/0").toWIF()

とりあえず実行してみる

const bitcoin = require("bitcoinjs-lib")
const bip39 = require("bip39")

const mnemonicToM = (mnemonic, password, network) => {
    const seed = bip39.mnemonicToSeed(mnemonic, password || "")
    const m = bitcoin.bip32.fromSeed(seed, bitcoin.networks[network || "bitcoin"])
    return m
}

const getAddress = (node) => {
    return bitcoin.payments.p2pkh({ pubkey: node.publicKey }).address
}

const mnemonic = bip39.generateMnemonic();
const m = mnemonicToM(mnemonic, '', 'bitcoin')
console.log(mnemonic)
console.log(m.derivePath("m/44'/0'/0'").toBase58())
console.log(m.derivePath("m/44'/0'/0'").neutered().toBase58())
console.log(getAddress(m.derivePath("m/44'/0'/0'/0/0")))