Security Architecture

Multi-Layer Security Model:

Wallet Security:

• Private keys stored in secure, encrypted environment variables

• Multi-signature capability for large transactions

• Regular key rotation procedures

• Hardware security module support for production environments

API Security Implementation:

// Rate limiting to prevent abuse
const rateLimiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100, // requests per IP
  standardHeaders: true,
});

// Admin endpoint protection
const adminAuth = (req, res, next) => {
  if (req.headers['x-admin-key'] !== process.env.ADMIN_KEY) {
    return res.status(403).json({ error: 'Unauthorized' });
  }
  next();
};

Database Security:

• All connections encrypted with SSL/TLS

• Sensitive data encrypted at rest using industry-standard algorithms

• Regular automated backups with point-in-time recovery

• Access controls and audit logging for all operations

Real-time Communication System

Server-Sent Events Architecture: The platform uses SSE to provide real-time updates to all connected clients, ensuring everyone sees spin results, new donations, and leaderboard changes instantly.

Connection Management:

// Client connection tracking and management
const activeConnections = new Set<express.Response>();

// Broadcast updates to all connected clients
function broadcastUpdate(eventType: string, data: any) {
  const message = `event: ${eventType}\ndata: ${JSON.stringify(data)}\n\n`;
  
  activeConnections.forEach(connection => {
    try {
      connection.write(message);
    } catch (error) {
      activeConnections.delete(connection);
    }
  });
}

Connection Management:

// Client connection tracking and management
const activeConnections = new Set<express.Response>();

// Broadcast updates to all connected clients
function broadcastUpdate(eventType: string, data: any) {
  const message = `event: ${eventType}\ndata: ${JSON.stringify(data)}\n\n`;
  
  activeConnections.forEach(connection => {
    try {
      connection.write(message);
    } catch (error) {
      activeConnections.delete(connection);
    }
  });
}

Event Types and Data Flow:

• spin_started: Notifies when a new charity selection begins

• spin_completed: Announces winner with transaction details

• transaction_confirmed: Updates when blockchain confirms donation

• stats_updated: Refreshes platform statistics and leaderboards