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Prerequisites

  • Dart SDK 3.11+ / Flutter 3.x+
  • Rust toolchain (rustup, cargo, rustc). The bark_bitcoin package compiles its Rust core at build time using Dart’s Native Assets feature.

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Getting started

1

Install the SDK

dart pub add bark_bitcoin
Then run:
dart pub get
2

Create a wallet

Configure the wallet for signet and initialize it.
import 'dart:io';
import 'package:bark_bitcoin/bark_bitcoin.dart';

Future<void> main() async {
  // Use a known test mnemonic (generate your own for real use)
  final mnemonic =
      "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";

  // Configure for signet
  final config = Config(
    serverAddress: "https://ark.signet.2nd.dev",
    esploraAddress: "https://esplora.signet.2nd.dev",
    bitcoindAddress: null,
    bitcoindCookiefile: null,
    bitcoindUser: null,
    bitcoindPass: null,
    network: Network.signet,
    vtxoRefreshExpiryThreshold: null,
    vtxoExitMargin: null,
    htlcRecvClaimDelta: null,
    fallbackFeeRate: null,
    roundTxRequiredConfirmations: null,
    daemonFastSyncIntervalSecs: null,
    daemonSlowSyncIntervalSecs: null,
  );

  // Create a data directory
  final dataDir = Directory('./bark_db');
  dataDir.createSync(recursive: true);

  // Create the wallet
  final wallet = await Wallet.create(
    mnemonic: mnemonic,
    config: config,
    datadir: dataDir.path,
    forceRescan: false,
  );
}
Back up the mnemonic securely. It is the only way to recover your wallet.
3

Get a receiving address

Generate an Ark address to receive funds.
final address = await wallet.newAddress();
print("Ark address: $address");
Send some signet sats to this address using the faucet.
4

Check your balance

Sync the wallet with the Ark server and read your balance.
sync is a reserved keyword in Dart. The method is named sync_() with a trailing underscore.
await wallet.sync_();

final balance = await wallet.balance();
print("Spendable: ${balance.spendableSats} sats");

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Next steps

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Source and examples

Full Dart source and example projects on GitLab.

How Ark works

Learn about the protocol powering your wallet.