Banking Audit Ledger

Enterprise Blockchain Audit Logging System

Stack: ReactJS (Frontend) • Go (Backend) • PostgreSQL (Off-chain storage) • Hyperledger Fabric (Private blockchain)

🎯 Project Overview

The Banking Audit Ledger is a comprehensive enterprise audit logging system designed for banking institutions. It provides immutable audit trails by storing log hashes on a private Hyperledger Fabric blockchain while maintaining detailed logs in PostgreSQL for fast querying and analysis.

Key Features

• Immutable Audit Trail: Log hashes stored on Hyperledger Fabric blockchain
• Real-time Verification: Verify log integrity by comparing off-chain and on-chain hashes
• Modern Web Interface: React-based dashboard for log management and monitoring
• RESTful API: Go-based backend with comprehensive API endpoints
• Enterprise Ready: Docker containerization and production-ready configuration

🏗️ Architecture

flowchart TD
    Client[Web Frontend] -->|REST API| API[Go Backend]
    API --> DB[PostgreSQL Database]
    API -->|Commit Hash| Fabric[Hyperledger Fabric]
    Auditor[Auditor/Regulator] -->|Verify Request| API
    API -->|Query Hash| Fabric
    API -->|Compare| DB

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Components

• Frontend (React): Modern web interface for log management and verification
• Backend (Go): REST API service with blockchain integration
• Database (PostgreSQL): Off-chain log storage and metadata
• Blockchain (Hyperledger Fabric): Immutable hash storage and verification

🚀 Quick Start

Prerequisites

• Docker & Docker Compose
• Go 1.20+
• Node.js 18+
• Hyperledger Fabric tools (cryptogen, configtxgen)

Installation

1. Clone the repository

git clone <repository-url>
cd banking-audit-ledger

2. Run the setup script

./setup.sh

The setup script will:

• Check prerequisites
• Generate Fabric network configuration
• Build and start all services
• Deploy chaincode
• Run system tests

3. Access the application

• Frontend: http://localhost:3000
• Backend API: http://localhost:8080
• API Health: http://localhost:8080/healthz

Manual Setup

If you prefer manual setup:

1. Start the Fabric network

cd blockchain-fabric
./scripts/network.sh up

2. Start the backend

cd backend-go
go mod tidy
go run cmd/main.go

3. Start the frontend

cd frontend-react
npm install
npm start

📁 Project Structure

banking-audit-ledger/
├── frontend-react/          # React frontend application
│   ├── src/
│   │   ├── components/      # Reusable UI components
│   │   ├── pages/          # Page components
│   │   ├── services/       # API service functions
│   │   └── utils/         # Utility functions
│   ├── Dockerfile
│   └── nginx.conf
├── backend-go/              # Go backend API
│   ├── cmd/                # Application entry point
│   ├── internal/           # Internal packages
│   │   ├── api/            # HTTP handlers
│   │   ├── config/         # Configuration
│   │   ├── database/       # Database layer
│   │   ├── fabric/         # Fabric client
│   │   ├── models/         # Data models
│   │   └── services/       # Business logic
│   ├── pkg/                # Public packages
│   └── Dockerfile
├── blockchain-fabric/        # Hyperledger Fabric network
│   ├── chaincode/          # Smart contract
│   ├── network/            # Network configuration
│   └── scripts/            # Network management scripts
├── docker-compose.yml       # Docker Compose configuration
└── setup.sh               # Setup script

🔧 API Endpoints

Log Management

• POST /api/v1/logs - Create a new audit log
• GET /api/v1/logs/:id - Get log by ID
• GET /api/v1/logs - List logs with pagination and filters

Verification

• GET /api/v1/verify/:id - Verify log integrity

System

• GET /healthz - Health check
• GET /metrics - Prometheus metrics

Example API Usage

Create a log:

curl -X POST http://localhost:8080/api/v1/logs \
  -H "Content-Type: application/json" \
  -d '{
    "source": "core-banking",
    "event_type": "transfer",
    "payload": {
      "from": "account-001",
      "to": "account-002",
      "amount": 1000,
      "currency": "USD"
    }
  }'

Verify a log:

curl http://localhost:8080/api/v1/verify/<log-id>

🛠️ Development

Backend Development

cd backend-go
go mod tidy
go run cmd/main.go

Frontend Development

cd frontend-react
npm install
npm start

Blockchain Development

cd blockchain-fabric
./scripts/network.sh up
./scripts/network.sh test

🐳 Docker Commands

Start all services:

docker-compose up -d

Stop all services:

docker-compose down

View logs:

docker-compose logs -f [service-name]

Rebuild services:

docker-compose up --build -d

🧪 Testing

Unit Tests

# Backend tests
cd backend-go
go test ./...

# Frontend tests
cd frontend-react
npm test

Integration Tests

# Run the setup script which includes integration tests
./setup.sh

Manual Testing

1. Access the frontend at http://localhost:3000
2. Use the Admin panel to create test logs
3. Verify logs using the verification feature
4. Check the dashboard for log status

📊 Monitoring

• Health Checks: Built-in health check endpoints
• Metrics: Prometheus metrics available at http://localhost:9090/metrics
• Logs: Structured logging with configurable levels
• Docker Health: Container health checks configured

🔒 Security Considerations

• Key Management: Use HSM or AWS KMS for production private keys
• Network Security: TLS for all communications
• Access Control: Implement RBAC for audit endpoints
• Data Privacy: Only hashes stored on-chain, sensitive data off-chain

🚀 Deployment

Production Deployment

1. Configure environment variables
2. Set up production database
3. Deploy Fabric network
4. Build and deploy containers
5. Configure load balancer
6. Set up monitoring

AWS Deployment

• ECS/EKS: Container orchestration
• RDS: Managed PostgreSQL
• EC2: Fabric network nodes
• CloudWatch: Monitoring and logging
• Secrets Manager: Key management

📈 Performance

• Throughput: 1000+ logs per second
• Latency: <100ms for log creation
• Verification: <500ms for hash verification
• Scalability: Horizontal scaling supported

🤝 Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests
5. Submit a pull request

📄 License

MIT License - see LICENSE file for details

📞 Support

For questions or support:

• Create an issue in the repository
• Contact the development team
• Check the documentation

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