# Cryptocurrency Exchange Package

## Overview

Comprehensive cryptocurrency exchange platform with wallet management, order matching, blockchain integration, and DeFi protocols.

## Features

### Wallet Management
- **Hot Wallets**: Online wallets for active trading with instant access
- **Cold Wallets**: Offline wallets for secure long-term storage
- **Multi-Currency Support**: BTC, ETH, USDT, and 100+ tokens
- **Hierarchical Deterministic (HD)**: BIP-32/44 wallet generation

### Order Matching Engine
- **Order Types**: Market, Limit, Stop-Loss, Stop-Limit
- **Price-Time Priority**: Fair order matching algorithm
- **Partial Fills**: Support for partial order execution
- **Fee Structure**: Maker-taker fee model (0.1% / 0.2%)

### DeFi Integration
- **Liquidity Pools**: Automated market maker (AMM) with constant product formula
- **Yield Farming**: Stake LP tokens to earn rewards
- **Staking**: Lock tokens for network security and rewards
- **Cross-Chain Bridges**: Multi-blockchain asset transfers

### Security Features
- **Two-Factor Authentication (2FA)**: TOTP-based authentication
- **Withdrawal Whitelist**: Pre-approved withdrawal addresses
- **Anomaly Detection**: ML-based suspicious activity monitoring
- **KYC/AML Compliance**: Identity verification and screening

## Regulatory Compliance

### Required Regulations
- **SEC (Securities and Exchange Commission)**: Securities compliance
- **FinCEN**: Financial Crimes Enforcement Network
- **BSA/AML**: Bank Secrecy Act / Anti-Money Laundering
- **KYC**: Know Your Customer requirements
- **GDPR**: Data protection for EU customers

### Security Standards
- **ISO-27001**: Information security management
- **SOC-2 Type II**: Service organization controls
- **PCI-DSS**: Payment card industry compliance

### Audit Requirements
- **Transaction Logs**: Immutable audit trail
- **Custody Audit**: Quarterly proof-of-reserves
- **Security Audits**: Annual penetration testing

## API Reference

### Wallet Management

```typescript
// Create new wallet
POST /api/v1/wallets
{
  "type": "hot" | "cold",
  "userId": "string"
}

// Get wallet balance
GET /api/v1/wallets/{address}/balance?token=BTC

// Deposit to wallet
POST /api/v1/wallets/{address}/deposit
{
  "token": "string",
  "amount": number,
  "txHash": "string"
}
```

### Trading

```typescript
// Place order
POST /api/v1/orders
{
  "type": "market" | "limit" | "stop_loss",
  "side": "buy" | "sell",
  "pair": "BTC-USD",
  "price": number,
  "quantity": number
}

// Get order book
GET /api/v1/orderbook/{pair}

// Cancel order
DELETE /api/v1/orders/{orderId}
```

### DeFi Operations

```typescript
// Add liquidity to pool
POST /api/v1/pools/{poolId}/liquidity
{
  "amountA": number,
  "amountB": number
}

// Swap tokens
POST /api/v1/pools/{poolId}/swap
{
  "tokenIn": "string",
  "amountIn": number,
  "minAmountOut": number
}

// Stake tokens
POST /api/v1/staking/{contractId}/stake
{
  "amount": number,
  "lockPeriod": number
}
```

## SPARQL Queries

The package includes 15 pre-built SPARQL templates for:
- Wallet balance queries
- Order history tracking
- Trade execution analysis
- Liquidity pool monitoring
- KYC/AML status checks
- Anomaly detection
- Portfolio valuation

## Implementation Examples

### Rust
```rust
use crypto_exchange::*;

let mut manager = WalletManager::new();
let wallet = manager.create_wallet(WalletType::HotWallet);
manager.deposit(&wallet.address, "BTC", 1.0)?;
```

### TypeScript
```typescript
import { WalletManager } from '@ggen/crypto-exchange';

const manager = new WalletManager();
const wallet = manager.createWallet('hot');
manager.deposit(wallet.address, 'ETH', 10.0);
```

### Python
```python
from exchange import WalletManager

manager = WalletManager()
wallet = manager.create_wallet('hot')
manager.deposit(wallet.address, 'USDT', 1000.0)
```

## Security Best Practices

1. **Never store private keys in plaintext**
2. **Use cold storage for 95% of funds**
3. **Implement rate limiting on withdrawals**
4. **Enable 2FA for all users**
5. **Regular security audits**
6. **Proof-of-reserves verification**
7. **Multi-signature wallets for large transactions**

## Testing

Comprehensive Chicago TDD test suite included with:
- Unit tests (wallet, orders, pools)
- Integration tests (complete trade flow)
- Security tests (reentrancy, overflow)
- Performance tests (order matching)

Run tests:
```bash
cargo test  # Rust
npm test    # TypeScript
pytest      # Python
```

## License

MIT License - See LICENSE file for details
