Cardano Dart SDK for Flutter

A high-level, cross-platform Dart SDK for Cardano wallet operations, targeting Flutter apps. This library enables parsing, address/key derivation, and transaction signing for Cardano, with a focus on security and performance.

Tested on: Android, iOS, and Web. Should work on all Dart/Flutter platforms.

Features

BIP32-ED25519 HD wallet support (mnemonic/seed to keys/addresses)
Cardano Shelley, Byron, and multi-era address support
Transaction parsing, signing, and serialization
Data signing (including dRep and committee credentials)
Public key and address derivation (including xpub support)
UTXO parsing and manipulation
Web worker/wasm support for fast, non-blocking operations on web
Built on top of cardano_dart_types for Cardano primitives
Modern, null-safe Dart codebase

Supported Standards

BIP-32 (HD wallets)
BIP-39 (mnemonic)
BIP-44 (multi-account)
CIP-3 (key generation)
CIP-5 (Bech32 prefixes)
CIP-1852 (wallet structure)
CIP-1855 (forging keys)
CIP-19 (address structure)
CIP-105 (Conway dRep/committee derivations)

Installation

Add the following to your pubspec.yaml:

dependencies:
  cardano_flutter_sdk: ^2.5.1
  cardano_dart_types:

Note: You must add a dependency to cardano_dart_types as well (do not specify a version; let pub resolve the compatible one).

Platform Support

Android: Fully supported
iOS: Fully supported
Web: Fully supported (uses web workers/wasm for performance)
Other Dart/Flutter platforms: Should work, but not explicitly tested

Quick Start

1. Create a Wallet from Mnemonic

import 'package:cardano_flutter_sdk/cardano_flutter_sdk.dart';
import 'package:cardano_dart_types/cardano_dart_types.dart';

void main() async {
  const mnemonic =
    'chief fiber betray curve tissue output feature jungle adapt smile brown crane accuse gospel plate unlock pull arrow hard february tape soccer patrol fetch';
  final wallet = await WalletFactory.fromMnemonic(NetworkId.mainnet, mnemonic.split(' '));

  final addrKit = await wallet.getPaymentAddressKit(addressIndex: 0);
  print('Address: \\${addrKit.address.bech32Encoded}');
  print('Stake Address: \\${wallet.stakeAddress.bech32Encoded}');
}

2. Sign a Transaction

import 'package:cardano_flutter_sdk/cardano_flutter_sdk.dart';
import 'package:cardano_dart_types/cardano_dart_types.dart';

void main() async {
  const mnemonic = 'chief fiber ... fetch';
  final wallet = await WalletFactory.fromMnemonic(NetworkId.testnet, mnemonic.split(' '));

  final txHex = '...'; // Your CBOR-encoded transaction hex
  final tx = CardanoTransaction.deserializeFromHex(txHex);

  final witnessSet = await wallet.signTransaction(
    tx: tx,
    witnessBech32Addresses: {'addr_test1...'},
  );

  final signedTx = tx.copyWithAdditionalSignatures(witnessSet);
  print(signedTx.serializeHexString());
}

3. Derive Addresses from xpub

import 'package:cardano_flutter_sdk/cardano_flutter_sdk.dart';
import 'package:cardano_dart_types/cardano_dart_types.dart';

void main() async {
  const xpub = 'xpub1...';
  final acc = await CardanoPubAccountWorkerFactory.instance.fromBech32XPub(xpub);
  print(await acc.stakeAddress(NetworkId.mainnet));
  for (var i = 0; i < 5; i++) {
    print(await acc.paymentBech32Address(i, NetworkId.mainnet));
    print(await acc.changeBech32Address(i, NetworkId.mainnet));
  }
}

Example Projects

See the example/ directory for more usage examples:

wallet_example.dart: Wallet creation, address derivation
sign_tx_example.dart: Transaction signing
xpub_example.dart: xpub address derivation
utxos_example.dart: UTXO parsing
wallet_factory_example.dart: Mnemonic generation and batch wallet creation

Contributing

Contributions, issues, and feature requests are welcome! See issues.

License

MIT