npm package: @prathammahajan/blockchain-integration
Description: 🚀 Comprehensive blockchain integration suite with multi-chain cryptocurrency support, NFT marketplace, smart contracts, DeFi protocols, and enterprise-grade wallet management
Author: Pratham Mahajan
Latest version: 1.0.1

# 🚀 Blockchain Integration - Crypto & NFT Support

**The most comprehensive blockchain integration suite for Node.js with multi-chain cryptocurrency support, NFT marketplace, smart contracts, DeFi protocols, and enterprise-grade wallet management.**

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> **🎯 Perfect for**: Cryptocurrency exchanges, NFT marketplaces, DeFi applications, wallet services, cross-chain bridges, smart contract platforms, and enterprise blockchain solutions.

## ✨ Key Features

### 🔗 **Multi-Chain Support**
- **Bitcoin** - Full UTXO model support with transaction management
- **Ethereum** - EVM-compatible chains (Ethereum, BSC, Polygon, Avalanche)
- **Solana** - High-performance account-based blockchain
- **Cardano** - UTXO model with smart contract support
- **Polkadot** - Parachain ecosystem integration

### 💰 **Cryptocurrency Management**
- **Multi-currency support** - Bitcoin, Ethereum, ERC-20 tokens, and more
- **Transaction processing** - Send, receive, and track transactions
- **Balance monitoring** - Real-time balance updates across networks
- **Gas optimization** - Intelligent gas price estimation and optimization

### 🎨 **NFT Marketplace**
- **NFT minting** - Create ERC-721 and ERC-1155 tokens
- **Marketplace integration** - List, buy, sell, and auction NFTs
- **Metadata management** - IPFS integration for decentralized storage
- **Collection management** - Organize and manage NFT collections

### 📜 **Smart Contracts**
- **Contract deployment** - Deploy contracts across multiple networks
- **Function interaction** - Call contract methods and read state
- **Event monitoring** - Real-time contract event listening
- **Gas estimation** - Optimize transaction costs

### 🔐 **Advanced Wallet Management**
- **HD Wallets** - Hierarchical deterministic wallet generation
- **Multi-signature** - Multi-sig wallet creation and management
- **Hardware wallet support** - Ledger and Trezor integration
- **Wallet encryption** - Secure private key storage and encryption

### 🏦 **DeFi Integration**
- **Liquidity pools** - Uniswap, SushiSwap, PancakeSwap integration
- **Yield farming** - Automated yield optimization strategies
- **Staking protocols** - Token staking across multiple networks
- **Lending platforms** - Compound, Aave, MakerDAO integration

### 🌉 **Cross-Chain Bridge**
- **Asset bridging** - Transfer tokens between different blockchains
- **Bridge monitoring** - Track cross-chain transaction status
- **Multi-chain compatibility** - Seamless network switching

### 🛡️ **Security & Compliance**
- **Transaction auditing** - Comprehensive transaction analysis
- **Compliance checking** - KYC/AML integration
- **Security monitoring** - Real-time threat detection
- **Encryption services** - Advanced cryptographic protection

## 🎯 Why Choose This Blockchain Integration?

### 🚀 **Production-Ready**
- **Battle-tested** - Used in production environments
- **High performance** - Optimized for speed and efficiency
- **Scalable** - Handles high transaction volumes
- **Reliable** - Comprehensive error handling and recovery

### 🛡️ **Enterprise-Grade Security**
- **Advanced encryption** - Military-grade security protocols
- **Compliance ready** - Built-in KYC/AML features
- **Audit trails** - Complete transaction history tracking
- **Multi-layer security** - Hardware wallet and multi-sig support

### 🔧 **Developer-Friendly**
- **Simple API** - Easy-to-use interface
- **Comprehensive documentation** - Detailed guides and examples
- **TypeScript support** - Full type definitions included
- **Extensive examples** - Ready-to-use code samples

### 🌐 **Multi-Chain Native**
- **Universal compatibility** - Works across all major blockchains
- **Cross-chain operations** - Seamless asset transfers
- **Network agnostic** - Switch between networks effortlessly
- **Future-proof** - Easy to add new blockchain support

## 📦 Installation

### Prerequisites
- **Node.js** 16.0.0 or higher
- **npm** 8.0.0 or higher

### Install the Package
```bash
npm install @prathammahajan/blockchain-integration
```

### Quick Install with Yarn
```bash
yarn add @prathammahajan/blockchain-integration
```

### Install with pnpm
```bash
pnpm add @prathammahajan/blockchain-integration
```

## 🚀 Quick Start

```javascript
const BlockchainEngine = require('@prathammahajan/blockchain-integration');

// Initialize blockchain engine
const blockchain = new BlockchainEngine({
  networks: {
    ethereum: {
      enabled: true,
      rpc: 'https://mainnet.infura.io',
      chainId: 1
    },
    bitcoin: {
      enabled: true,
      rpc: 'https://blockstream.info',
      network: 'mainnet'
    }
  },
  wallet: {
    enabled: true,
    encryption: true
  },
  nft: {
    enabled: true,
    marketplace: true
  }
});

// Create wallet and send transaction
const wallet = await blockchain.createWallet('hd');
const result = await blockchain.sendTransaction(
  wallet.walletId,
  '0xrecipient',
  '1.0',
  'ethereum'
);

console.log('Transaction sent:', result.txHash);
```

## 📋 Basic Usage

### Wallet Management
```javascript
// Create HD wallet
const wallet = await blockchain.createWallet('hd');

// Create multi-signature wallet
const multiSigWallet = await blockchain.createWallet('multisig', {
  requiredSignatures: 2,
  totalSigners: 3
});

// Import wallet from private key
const importedWallet = await blockchain.importWallet('privatekey', privateKey);

// Get wallet balance
const balance = await blockchain.getWalletBalance(wallet.walletId, 'ethereum');
```

### Cryptocurrency Operations
```javascript
// Send transaction
const txResult = await blockchain.sendTransaction(
  wallet.walletId,
  '0xrecipient',
  '1.0',
  'ethereum'
);

// Get transaction status
const status = await blockchain.getTransactionStatus(txResult.txHash, 'ethereum');

// Get transaction history
const history = await blockchain.getTransactionHistory(wallet.walletId, 'ethereum');
```

### NFT Operations
```javascript
// Mint NFT
const mintResult = await blockchain.mintNFT(
  contractAddress,
  wallet.address,
  tokenURI
);

// Transfer NFT
const transferResult = await blockchain.transferNFT(
  contractAddress,
  fromAddress,
  toAddress,
  tokenId
);

// List NFT for sale
const listResult = await blockchain.listNFT(contractAddress, tokenId, price);
```

### Smart Contract Operations
```javascript
// Deploy contract
const deployResult = await blockchain.deployContract(contractCode, constructorArgs);

// Call contract method
const callResult = await blockchain.callContract(
  contractAddress,
  'methodName',
  args
);
```

### DeFi Operations
```javascript
// Add liquidity
const liquidityResult = await blockchain.addLiquidity(
  poolAddress,
  tokenA,
  tokenB,
  amountA,
  amountB
);

// Stake tokens
const stakeResult = await blockchain.stakeTokens(tokenAddress, amount);
```

## 🔧 Configuration

```javascript
const blockchain = new BlockchainEngine({
  networks: {
    ethereum: {
      enabled: true,
      rpc: 'https://mainnet.infura.io',
      chainId: 1,
      gasLimit: 21000
    },
    bitcoin: {
      enabled: true,
      rpc: 'https://blockstream.info',
      network: 'mainnet',
      confirmations: 6
    }
  },
  wallet: {
    enabled: true,
    encryption: true,
    backup: true,
    security: true
  },
  nft: {
    enabled: true,
    marketplace: true,
    metadata: true,
    ipfs: false
  },
  smartContracts: {
    enabled: true,
    deployment: true,
    interaction: true,
    monitoring: true
  },
  defi: {
    enabled: true,
    protocols: ['uniswap', 'compound'],
    staking: true,
    yieldFarming: true
  },
  security: {
    enabled: true,
    audit: true,
    compliance: true,
    monitoring: true
  }
});
```

## 🎯 Advanced Examples

### Multi-Chain Operations
```javascript
// Switch between networks
await blockchain.switchNetwork('ethereum');
await blockchain.switchNetwork('bitcoin');

// Cross-chain bridge
const bridgeResult = await blockchain.bridgeTokens(
  'ethereum',
  'polygon',
  tokenAddress,
  amount
);
```

### Event Monitoring
```javascript
// Listen to blockchain events
blockchain.on('transactionSent', (data) => {
  console.log('Transaction sent:', data.txHash);
});

blockchain.on('transactionConfirmed', (data) => {
  console.log('Transaction confirmed:', data.txHash);
});

blockchain.on('walletCreated', (data) => {
  console.log('Wallet created:', data.walletId);
});
```

### Security and Compliance
```javascript
// Audit transaction
const auditResult = await blockchain.auditTransaction(txHash, 'ethereum');

// Check compliance
const complianceResult = await blockchain.checkCompliance(address, 'ethereum');
```

## 🛠️ Supported Networks

| Network | Type | Features |
|---------|------|----------|
| **Bitcoin** | UTXO | Transactions, addresses, blocks |
| **Ethereum** | EVM | Smart contracts, tokens, DeFi |
| **Binance Smart Chain** | EVM | Fast transactions, low fees |
| **Polygon** | EVM | Layer 2 scaling, NFTs |
| **Avalanche** | EVM | High throughput, DeFi |
| **Solana** | Account-based | Fast transactions, NFTs |
| **Cardano** | UTXO | Smart contracts, staking |
| **Polkadot** | Relay chain | Parachains, governance |

## 📝 API Reference

### BlockchainEngine Methods

| Method | Description |
|--------|-------------|
| `createWallet(type, options)` | Create a new wallet |
| `importWallet(type, data, options)` | Import existing wallet |
| `sendTransaction(fromWallet, toAddress, amount, network, options)` | Send transaction |
| `getTransactionStatus(txHash, network)` | Get transaction status |
| `mintNFT(contractAddress, toAddress, tokenURI, options)` | Mint NFT |
| `deployContract(contractCode, constructorArgs, options)` | Deploy smart contract |
| `addLiquidity(poolAddress, tokenA, tokenB, amountA, amountB, options)` | Add liquidity |
| `bridgeTokens(fromChain, toChain, tokenAddress, amount, options)` | Bridge tokens |
| `getSystemStatus()` | Get system status |

### Events

| Event | Description | Data |
|-------|-------------|------|
| `initialized` | Engine initialized | `{ timestamp }` |
| `walletCreated` | Wallet created | `{ walletId, type, address }` |
| `transactionSent` | Transaction sent | `{ txHash, amount, network }` |
| `transactionConfirmed` | Transaction confirmed | `{ txHash, blockNumber }` |
| `nftMinted` | NFT minted | `{ tokenId, contractAddress }` |
| `contractDeployed` | Contract deployed | `{ contractAddress, txHash }` |

## 🤝 Contributing

1. Fork the repository
2. Create your feature branch (`git checkout -b feature/amazing-feature`)
3. Commit your changes (`git commit -m 'Add 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](LICENSE) file for details.

## 🚀 Use Cases & Applications

**Ideal for:**
- **Cryptocurrency exchanges** requiring multi-chain support
- **NFT marketplaces** with minting and trading capabilities
- **DeFi applications** with liquidity and staking features
- **Wallet applications** with advanced security features
- **Cross-chain bridges** for asset transfers
- **Smart contract platforms** with deployment and interaction
- **Enterprise blockchain solutions** with compliance features
- **Web3 applications** with comprehensive blockchain integration

## 🔍 SEO & Discoverability

**Search Terms**: Blockchain integration, cryptocurrency support, NFT marketplace, smart contracts, wallet management, multi-chain, DeFi, cross-chain, Bitcoin, Ethereum, Web3, crypto trading, digital assets, blockchain development, cryptocurrency API, NFT API, smart contract API, wallet API, blockchain SDK, cryptocurrency SDK, NFT SDK, smart contract SDK, wallet SDK, blockchain library, cryptocurrency library, NFT library, smart contract library, wallet library

## 🙏 Support

- 📧 **Issues**: [GitHub Issues](https://github.com/prathammahajan13/blockchain-integration/issues)
- 📖 **Documentation**: [GitHub Wiki](https://github.com/prathammahajan13/blockchain-integration/wiki)
- 💬 **Discussions**: [GitHub Discussions](https://github.com/prathammahajan13/blockchain-integration/discussions)

---

**Made with ❤️ by [Pratham Mahajan](https://github.com/prathammahajan13)**