J-Bitcoin

Bitcoin Custodial & non-Custodial Wallets

Coin	Custodial & non-Custodial Wallet Support
BTC	✔️
BCH	✔️
BSV	✔️

Getting started

npm i j-bitcoin

import { Custodial_Wallet, Non_Custodial_Wallet } from 'j-bitcoin';

Custodial Wallet

Generate wallet

const [mnemonic, wallet] = Custodial_Wallet.fromRandom('main'); // main network
const [mnemonic, wallet] = Custodial_Wallet.fromRandom('test'); // test network

Import from mnemonic

const 
    mnemonic = "teach scatter sample solar casino festival decrease pause random drip memory mystery",
    wallet = Custodial_Wallet.fromMnemonic('main', mnemonic);

Import from seed

const 
    seed = "000102030405060708090a0b0c0d0e0f",
    wallet = Custodial_Wallet.fromSeed('main', seed);

Password

const [mnemonic, wallet] = Custodial_Wallet.fromRandom('main', 'password123');
// ...
const wallet = Custodial_Wallet.fromMnemonic('main', mnemonic, 'password123');
// Incorrect password returns random wallet

Derive child

wallet.derive("m/0", 'pri');
Public Keys can't derive from a hardend path wallet.derive("m/0'", 'pub'); // Throws Error

Signature - ECDSA

const message = "Jamallo"; sign const [sig, recovery] = wallet.sign(message);

verfiy siganture wallet.verify(sig, message); // true

Non-Custodial Wallet

Threshold Signature Scheme (TSS) wallet

Generate wallet

const wallet = Non_Custodial_Wallet.fromRandom("main", 3, 2); // main network
const wallet = Non_Custodial_Wallet.fromRandom("test", 3, 2); // test network

Import from shares

const shares = [
    '79479395a59a8e9d930f2b10ccd5ac3671b0ff0bf8a66aaa1d74978c5353694b',
    '98510126c920e18b148130ac1145686cb299d21f0e010b98ede44169a7bb1c13',
    'b75a6eb7eca7347895f3364755b524a2f382a532235bac87be53eb46fc22cedb'
  ]

const wallet = Non_Custodial_Wallet.fromShares("main", shares, 2);

Shares

const share_for_each_participant = wallet._shares;

Restore private key

const groups_prikey = wallet._privateKey;

Signature

sign const { sig, serialized_sig, msgHash, recovery_id } = wallet.sign("hello world");

verfiy siganture wallet.verify(sig, msgHash); // true

Address conversion

import { CASH_ADDR, BECH32 } from 'j-bitcoin';

CashAddr (BCH)

 wallet.address; // 1EiBTNS9Dqhjhk7D78GMAjK9pZn5NXZf91
 CASH_ADDR.to_cashAddr(wallet.address); // bitcoincash:qztxx64w20kmy5y9sskjwtgxp3j8dc20ksvef26ssu

 wallet.address; // mgRpP3zP1hmxyoeYJgfbcmN3c2Qsurw48D 
 CASH_ADDR.to_cashAddr(wallet.address); // bchtest:qqyl7uye7t0rjq6vrtqjedcyudy8hj0rzvnwwa5c5g

P2WPKH (BTC)

  wallet.address; // 1EiBTNS9Dqhjhk7D78GMAjK9pZn5NXZf91
  BECH32.to_P2WPKH(wallet.address); // bc1qje3k4tjnake9ppvy95nj6psvv3mwzna5uatznl

  wallet.address; // mgRpP3zP1hmxyoeYJgfbcmN3c2Qsurw48D
  BECH32.to_P2WPKH(wallet.address); // tb1qp8lhpx0jmcusxnq6cyktwp8rfpaunccntw8kty

Schnorr signature

import { schnorr_sig } from 'j-bitcoin'; const [private_key, message] = ["L1vHfV6GUbMJSvFaqjnButzwq5x4ThdFaotpUgsfScwMNKjdGVuS", "Jamallo"];

sign const signature = schnorr_sig.sign(private_key, message);

retrieve public key const public_key = schnorr_sig.retrieve_public_key(private_key);

verfiy siganture schnorr_sig.verify(signature, message, public_key); // true

Info

Signature	Support
ECDSA	✔️
Threshold Signature	✔️
Schnorr signature	✔️

Address	Support
P2PKH	✔️
P2WPKH	✔️
P2SH	❌️
P2WSH	❌️
Cashaddr	✔️️

Transaction	Support
BTC	❌
BCH	❌ ️
BSV	❌

TODO

• P2SH
• P2WSH
• Transactions
• SPV wallet