Bark is an implementation of the Ark protocol on bitcoin, led by Second. The Ark protocol is a bitcoin layer 2 for making fast, low-cost, self-custodial payments at scale. Ark uses a client-server model to enable users to transact off-chain while still being able to "exit" their balances on-chain at any time.

Runs in the browser via WebAssembly with IndexedDB persistence.

Installation

npm install @secondts/bark

Bundlers (webpack, Rollup, Vite, Next.js, React, Vue, Svelte)

The default entrypoint is the wasm-bindgen bundler target. Your bundler discovers the .wasm file via new URL(..., import.meta.url) and bundles it.

import init, { Wallet, generateMnemonic } from "@secondts/bark";

await init?.();

const mnemonic = generateMnemonic();
const wallet = await Wallet.create(mnemonic, config, "wallet-db");

Vanilla browser (<script type="module">)

Use the ./web subpath. Pass the .wasm URL to init() explicitly (or let it auto-resolve via import.meta.url).

<script type="module">
  import init, { Wallet, generateMnemonic } from "https://unpkg.com/@secondts/bark/web/bark_ffi_wasm.js";
  await init();

  const mnemonic = generateMnemonic();
</script>

Notes

• Persistence uses IndexedDB; the wallet is keyed by the name passed to Wallet.create(..., dbName).
• WASM runs in the main thread by default. For heavy operations consider running it inside a Web Worker.
• Crypto requires the page to be served over HTTPS (or localhost); crypto.subtle is only available in secure contexts.

License

Released under the MIT license.