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Technical Overview

The Provfair gaming platform uses a microservices architecture built with NestJS and TypeScript. The system provides enterprise-grade scalability, security, and transparency for online gaming operations through containerized services, automated scaling, and comprehensive monitoring.

Architecture Overview​

Core Technology Stack​

  • Backend Framework: NestJS with TypeScript
  • Architecture Pattern: Microservices with GraphQL Federation
  • Database: MongoDB with Mongoose ODM
  • Caching: Redis for distributed caching and session management
  • Message Queue: BullMQ with Redis for background processing
  • Real-time Communication: Socket.IO with Redis adapter for horizontal scaling
  • Authentication: JWT-based with role-based access control
  • Monitoring: Structured logging with Pino and OpenTelemetry

Microservices Architecture​

Game Portfolio​

The platform supports a wide range of provably fair games built on flexible microservices architecture. Below are some example games that demonstrate the different game mechanics and logic patterns:

Example Games​

  • Crash: Multiplayer game with real-time betting and multiplier mechanics
  • Mines: Strategic single-player game with customizable difficulty levels
  • HiLo: Card-based prediction game with progressive risk/reward mechanics
  • Plinko: Physics-based probability game with multiple risk levels
  • Dice: Classic dice rolling with customizable conditions and multipliers
  • Limbo: Multiplier-based game with simple mechanics
  • Diamonds: Grid-based discovery game with progressive rewards
  • Slide: Multiplayer sliding scale game

Game Categories​

  • Multiplayer Games: Real-time games supporting multiple concurrent players (Crash, Slide, etc.)
  • Single Player Games: Individual gameplay with instant results (Mines, HiLo, Plinko, Dice, Limbo, Diamonds, etc.)
Extensible Architecture

The platform architecture supports many additional game types that follow similar logic patterns and microservices design.

Provably Fair Technology​

Cryptographic Foundation​

Our provably fair system implements industry-leading cryptographic standards:

  • Hash Algorithms: SHA-256 and SHA-512 for different game types
  • Seed Generation: Cryptographically secure randomBytes(32) from Node.js crypto module
  • External Randomness: Bitcoin block hashes for additional entropy
  • HMAC Authentication: HMAC-SHA256 for deterministic randomness generation

Seed Management System​

Server seeds are generated using cryptographically secure random bytes and hashed before commitment. Game outcomes are generated using HMAC-SHA256 with server seed, client seed, nonce, and cursor parameters to ensure deterministic yet unpredictable results.

Verification Process​

  1. Pre-commitment: Server seeds are hashed and committed before games begin
  2. Client Control: Players can customize client seeds at any time
  3. Nonce System: Incremental counters prevent seed reuse
  4. Outcome Verification: Complete transparency through /verifyFairness API
  5. Historical Audit: Full seed history maintained for independent verification

Mathematical Precision​

  • RTP Implementation: Precise Return-to-Player calculations with configurable rates
  • House Edge Configuration: Flexible house edge settings with multiple tier options
  • Probability Distributions: Mathematically verified multiplier tables
  • Fair Distribution: Advanced algorithms ensure unbiased outcome generation

Security Architecture​

Authentication & Authorization​

  • JWT-based Authentication: Dual token system (user/admin) with configurable secrets
  • Role-based Access Control: Granular permissions using decorators (@IsAuthenticated())
  • Internal Service Security: Key-based authentication for microservice communication
  • Session Management: Distributed session handling via Redis

Security Headers Implementation​

Standard security headers are implemented including Strict Transport Security, Content Security Policy, frame options, content type protection, referrer policy, and XSS protection to prevent common web vulnerabilities.

Input Validation & Data Protection​

  • Comprehensive Validation: Class-validator decorators with GraphQL type safety
  • JSON Schema Validation: AJV-based validation for WebSocket inputs
  • Sensitive Data Filtering: Automatic filtering of sensitive fields in logs
  • NoSQL Security: Mongoose schema validation with proper indexing

Network Security​

  • GraphQL Security: Query complexity analysis to prevent DoS attacks
  • WebSocket Authentication: JWT-based authentication for real-time connections
  • Rate Limiting: Distributed locking via Redlock for abuse prevention
  • Error Handling: Structured error responses without information leakage

Horizontal Scalability Design​

Microservices Benefits​

  • Independent Scaling: Each game service scales based on demand
  • Technology Flexibility: Service-specific technology choices
  • Fault Isolation: Service failures don't cascade
  • Team Autonomy: Independent development and deployment cycles

Real-time Scaling​

WebSocket connections scale horizontally using Redis adapters for cross-instance communication. Distributed session management stores session data in Redis with configurable TTL and prefix-based organization.

Caching Strategy​

  • Multi-level Caching: Application, Redis, and CDN layers
  • Cache Invalidation: Event-driven cache updates
  • Session Clustering: Shared session state across instances
  • Game State Caching: Optimized game data retrieval

Best Practices Implementation​

Code Quality​

  • TypeScript: Full type safety across the entire codebase
  • ESLint/Prettier: Consistent code formatting and linting
  • Husky: Pre-commit hooks for code quality enforcement
  • Modular Architecture: Clean separation of concerns with shared libraries

Testing Strategy​

  • Unit Testing: Jest-based unit tests for business logic
  • Integration Testing: E2E testing for critical user journeys
  • Performance Testing: Load testing for game endpoints
  • Security Testing: Automated security scanning in CI/CD

Monitoring & Observability​

  • Structured Logging: JSON-formatted logs with correlation IDs
  • Metrics Collection: Application and infrastructure metrics
  • Error Tracking: Centralized error monitoring and alerting
  • Health Checks: Comprehensive health monitoring for all services

Development Workflow​

  • Git Flow: Structured branching strategy for feature development
  • CI/CD Pipeline: Automated testing and deployment pipeline
  • Feature Flags: Safe feature rollouts with gradual exposure
  • Database Migrations: Version-controlled database schema changes

Performance Optimizations​

Database Optimization​

  • Connection Pooling: Optimized MongoDB connection management
  • Indexing Strategy: Strategic indexes for query performance
  • Read Replicas: Read scaling through replica sets
  • Query Optimization: Optimized aggregation pipelines

Caching Strategy​

  • Redis Clustering: High-availability Redis setup
  • Cache Warming: Proactive cache population
  • TTL Management: Intelligent cache expiration strategies
  • Cache Invalidation: Event-driven cache updates

CDN Integration​

  • Static Asset Delivery: Global CDN for static resources
  • API Caching: Edge caching for cacheable API responses
  • Compression: Gzip/Brotli compression for all responses

Key Features​

Platform Capabilities​

  • Provably Fair Games: Cryptographically verifiable outcomes using SHA-256 and HMAC
  • Horizontal Scaling: Auto-scaling microservices handle variable player loads
  • Real-time Communication: WebSocket support for multiplayer games
  • Comprehensive Security: JWT authentication, encrypted data, and security headers
  • High Performance: Sub-100ms response times with CDN acceleration

Operational Benefits​

  • Infrastructure as Code: Automated deployments and consistent environments
  • Monitoring and Observability: Structured logging and distributed tracing
  • Multi-region Support: Cross-region deployment for disaster recovery
  • Cost Optimization: Resource scaling and spot instance usage

Summary​

The platform architecture supports scalable gaming operations through microservices design, automated infrastructure management, and comprehensive security controls. The system handles variable player loads while maintaining game fairness through cryptographic verification and providing operational visibility through monitoring and logging systems.