React Native Multi-Crypto Wallet

A TypeScript library for creating and managing Bitcoin, Ethereum, Binance Smart Chain (BSC), Polygon, Dash, Litecoin, and Dogecoin wallets in React Native applications. This library provides a unified interface for handling different cryptocurrency wallets while following BIP standards for key derivation and address generation.

Features

• BIP39 mnemonic generation and import
• BIP32/44 HD wallet support
• Bitcoin wallet functionality (Legacy and SegWit addresses)
• Ethereum wallet functionality
• Binance Smart Chain (BSC) wallet functionality
• Polygon wallet functionality
• Dash wallet functionality
• Litecoin wallet functionality
• Dogecoin wallet functionality
• TypeScript support
• Comprehensive test coverage

Installation

npm install react-native-multi-crypto-wallet

Dependencies

This package requires the following peer dependencies:

{
  "bip32": "^3.0.1",
  "bip39": "^3.0.4",
  "bitcoinjs-lib": "^6.1.0",
  "ethers": "^6.0.0",
  "ethereumjs-util": "^7.1.5",
  "tiny-secp256k1": "^2.2.1"
}

Usage

Bitcoin Wallet

import { BitcoinWallet, CryptoNetwork } from 'react-native-multi-crypto-wallet';

// Create a new Bitcoin wallet
const bitcoinWallet = new BitcoinWallet({
  network: CryptoNetwork.BITCOIN_TESTNET // or BITCOIN_MAINNET
});

// Generate a new mnemonic
const mnemonic = bitcoinWallet.generateMnemonic();
console.log('Mnemonic:', mnemonic);

// Get wallet address
const address = bitcoinWallet.getAddress();
console.log('Bitcoin Address:', address);

// Get private key
const privateKey = bitcoinWallet.getPrivateKey();
console.log('Private Key:', privateKey);

// Get public key
const publicKey = bitcoinWallet.getPublicKey();
console.log('Public Key:', publicKey);

// Import existing wallet from mnemonic
const importedWallet = new BitcoinWallet({
  network: CryptoNetwork.BITCOIN_TESTNET,
  mnemonic: 'your twelve word mnemonic phrase here'
});

Ethereum Wallet

import { EthereumWallet, CryptoNetwork } from 'react-native-multi-crypto-wallet';

// Create a new Ethereum wallet
const ethereumWallet = new EthereumWallet(CryptoNetwork.ETHEREUM_GOERLI); // or ETHEREUM_MAINNET, ETHEREUM_SEPOLIA

// Generate a new mnemonic
const mnemonic = ethereumWallet.generateMnemonic();
console.log('Mnemonic:', mnemonic);

// Get Ethereum address
const address = ethereumWallet.getAddress();
console.log('Ethereum Address:', address);

// Get private key
const privateKey = ethereumWallet.getPrivateKey();
console.log('Private Key:', privateKey);

// Get public key
const publicKey = ethereumWallet.getPublicKey();
console.log('Public Key:', publicKey);

// Check balance
const balance = await ethereumWallet.getBalance();
console.log('Balance:', balance, 'ETH');

// Import existing wallet from mnemonic
const importedEthWallet = new EthereumWallet({CryptoNetwork.ETHEREUM_GOERLI,
  mnemonic: 'your twelve word mnemonic phrase here'
});

// Sign a transaction
const transaction = {
  to: "0x1234...",
  value: ethers.parseEther("0.1"),
  gasLimit: "21000",
};
const signedTx = await ethereumWallet.signTransaction(transaction);

BNB Wallet

import { BNBWallet, CryptoNetwork } from 'react-native-multi-crypto-wallet';

// Create a new BNB wallet
const bnbWallet = new BNBWallet({
  network: CryptoNetwork.BSC_MAINNET // or BSC_TESTNET
});

// Generate a new mnemonic
const mnemonic = bnbWallet.generateMnemonic();
console.log('Mnemonic:', mnemonic);

// Get BNB address
const address = bnbWallet.getAddress();
console.log('BNB Address:', address);

// Import existing wallet from mnemonic
const importedBnbWallet = new BNBWallet({
  network: CryptoNetwork.BSC_MAINNET,
  mnemonic: 'your twelve word mnemonic phrase here'
});

// Check balance
const balance = await bnbWallet.getBalance();
console.log('Balance:', balance, 'BNB');

Polygon Wallet

import { PolygonWallet, CryptoNetwork } from 'react-native-multi-crypto-wallet';

// Create a new Polygon wallet
const polygonWallet = new PolygonWallet({
  network: CryptoNetwork.POLYGON_MAINNET // or POLYGON_MUMBAI
});

// Generate a new mnemonic
const mnemonic = polygonWallet.generateMnemonic();
console.log('Mnemonic:', mnemonic);

// Get MATIC address
const address = polygonWallet.getAddress();
console.log('Polygon Address:', address);

// Import existing wallet from mnemonic
const importedPolygonWallet = new PolygonWallet({
  network: CryptoNetwork.POLYGON_MAINNET,
  mnemonic: 'your twelve word mnemonic phrase here'
});

// Check balance
const balance = await polygonWallet.getBalance();
console.log('Balance:', balance, 'MATIC');

Dash Wallet

import { DashWallet, CryptoNetwork } from 'react-native-multi-crypto-wallet';

// Create a new Dash wallet
const dashWallet = new DashWallet({
  network: CryptoNetwork.DASH_MAINNET // or DASH_TESTNET
});

// Generate a new mnemonic
const mnemonic = dashWallet.generateMnemonic();
console.log('Mnemonic:', mnemonic);

// Get Dash address
const address = dashWallet.getAddress();
console.log('Dash Address:', address);

// Import existing wallet from mnemonic
const importedDashWallet = new DashWallet({
  network: CryptoNetwork.DASH_MAINNET,
  mnemonic: 'your twelve word mnemonic phrase here'
});

Litecoin Wallet

import { LitecoinWallet, CryptoNetwork } from 'react-native-multi-crypto-wallet';

// Create a new Litecoin wallet
const ltcWallet = new LitecoinWallet({
  network: CryptoNetwork.LITECOIN_MAINNET // or LITECOIN_TESTNET
});

// Generate a new mnemonic
const mnemonic = ltcWallet.generateMnemonic();
console.log('Mnemonic:', mnemonic);

// Get Litecoin address
const address = ltcWallet.getAddress();
console.log('Litecoin Address:', address);

// Import existing wallet from mnemonic
const importedLtcWallet = new LitecoinWallet({
  network: CryptoNetwork.LITECOIN_MAINNET,
  mnemonic: 'your twelve word mnemonic phrase here'
});

Dogecoin Wallet

import { DogecoinWallet, CryptoNetwork } from 'react-native-multi-crypto-wallet';

// Create a new Dogecoin wallet
const dogeWallet = new DogecoinWallet({
  network: CryptoNetwork.DOGECOIN_MAINNET // or DOGECOIN_TESTNET
});

// Generate a new mnemonic
const mnemonic = dogeWallet.generateMnemonic();
console.log('Mnemonic:', mnemonic);

// Get Dogecoin address
const address = dogeWallet.getAddress();
console.log('Dogecoin Address:', address);

// Import existing wallet from mnemonic
const importedDogeWallet = new DogecoinWallet({
  network: CryptoNetwork.DOGECOIN_MAINNET,
  mnemonic: 'your twelve word mnemonic phrase here'
});

Network Support

Bitcoin Networks

• CryptoNetwork.BITCOIN_MAINNET: Bitcoin Mainnet
• CryptoNetwork.BITCOIN_TESTNET: Bitcoin Testnet

Ethereum Networks

• CryptoNetwork.ETHEREUM_MAINNET: Ethereum Mainnet
• CryptoNetwork.ETHEREUM_GOERLI: Goerli Testnet
• CryptoNetwork.ETHEREUM_SEPOLIA: Sepolia Testnet

Binance Smart Chain (BSC) Networks

• CryptoNetwork.BSC_MAINNET: BSC Mainnet
• CryptoNetwork.BSC_TESTNET: BSC Testnet

Polygon Networks

• CryptoNetwork.POLYGON_MAINNET: Polygon Mainnet
• CryptoNetwork.POLYGON_MUMBAI: Polygon Mumbai Testnet

Dash Networks

• CryptoNetwork.DASH_MAINNET: Dash Mainnet
• CryptoNetwork.DASH_TESTNET: Dash Testnet

Litecoin Networks

• CryptoNetwork.LITECOIN_MAINNET: Litecoin Mainnet
• CryptoNetwork.LITECOIN_TESTNET: Litecoin Testnet

Dogecoin Networks

• CryptoNetwork.DOGECOIN_MAINNET: Dogecoin Mainnet
• CryptoNetwork.DOGECOIN_TESTNET: Dogecoin Testnet

Security

• Never store mnemonics or private keys in plain text
• Use secure storage solutions for sensitive data
• Always validate user input
• Consider using hardware wallets for large amounts

Development

Running Tests

npm test

Building

npm run build

Contributing

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

• BIP39 for mnemonic generation
• BIP32 for HD wallet specification
• BIP44 for multi-account hierarchy