Bitcoin SDK

Bitcoin SDK

In this integration guide, we will show you how to connect JoyID, sign message, and sign transaction with @joyid/bitcoin. @joyid/bitcoin has almost idential API as UniSat Wallet API (opens in a new tab), if you are familiar with UniSat Wallet API, you can easily use @joyid/bitcoin.


npm install @joyid/bitcoin


Before writing business code, you can call the initialization function initConfig on the project entry file:

import React from "react";
import ReactDOM from "react-dom/client";
import { initConfig } from "@joyid/bitcoin";
import App from "./App";
import "./index.css";
  // your app name
  name: "JoyID demo",
  // your app logo
  logo: "🆔",
  // JoyID app URL, this is for testnet, for mainnet, use ""
  joyidAppURL: "",
  // bitcoin address type, p2wpkh or p2tr
  requestAddressType: 'p2tr',
ReactDOM.createRoot(document.getElementById("root") as HTMLElement).render(
    <App />

Request Bitcoin account

After the initialization is completed, you can call the requestAccounts() function to connect to JoyID wallet, and call getPublickey() to get the public key of the connected account.


After a successful connection, JoyID persists the connection status to the local storage. This means that if your JavaScript code is running in server side, getPublickey() will return null. So you have to make sure that the code is running in the browser, or persists the connection status to the server side by your own.

import { requestAccounts, getPublickey } from "@joyid/bitcoin";
async function connect() {
  try {
    const [address] = await requestAccounts();
    const publicKey = getPublickey();
    console.log(address, publicKey);
  } catch (error) {

Sign message

You can call the signMessage() function to sign a message with the connected account. The signing type can be ecdsa or bip322-simple, default is ecdsa, return a signature in base64 format.

import { signMessage } from "@joyid/bitcoin";
async function sign() {
  try {
    const message = "Hello, JoyID!";
    const signature = await signMessage(message);
  } catch (error) {

Sign transaction

You can call the signPsbt() function to sign a transaction with the connected account. The transaction should be a valid bitcoin transaction in hex format.

import { signPsbt } from "@joyid/bitcoin";
async function sign() {
  const psbt = "..."
  const signedPsbt = await signPsbt(psbt);

API Reference

Full example

For a complete demo, you may check GitHub ↗ (opens in a new tab) and JoyID Bitcoin Demo ↗ (opens in a new tab) .