Decentralized KYC (Know Your Customer) System

A blockchain-based decentralized web application that revolutionizes the KYC verification process using Ethereum smart contracts, providing secure, transparent, and efficient identity verification for banks and their customers.

🌟 Features

For Users/Customers

• Secure Registration: Register on the platform with personal information
• Document Upload: Upload KYC documents (passport, citizenship front/back) with RSA encryption
• Request Verification: Submit KYC verification requests to banks
• Grant Access: Control which banks can access your verified KYC information
• Track Status: Monitor KYC verification status in real-time
• Multi-Bank Management: Manage relationships with multiple banks from one platform

For Banks

• Bank Registration: Register institutional accounts with license information
• Client Management: View and manage all bank clients
• KYC Verification: Verify or reject customer KYC submissions
• Access Requests: Request access to customers' verified KYC data
• Secure Data Access: Access encrypted customer information with proper permissions
• Dashboard Analytics: Comprehensive dashboard for managing clients and requests

For Administrators

• Bank Verification: Verify and approve bank registrations
• Platform Oversight: Monitor overall platform activity
• User Management: Oversee user and bank registrations

🏗️ Technical Architecture

Smart Contract (Solidity)

• Contract: DecentralizedKYC1.sol
• Blockchain: Ethereum (compatible with local Ganache and testnets)
• Features:
  • User and bank registration
  • KYC status management (NOT_UPLOADED, UPLOADED, REQUESTED, VERIFIED, REJECTED)
  • RSA cryptography for secure data handling
  • Access control with role-based permissions
  • Bank-client relationship management

Frontend (React.js)

• Framework: React 17+ with Material-UI components
• Wallet Integration: MetaMask support via ethers.js
• Storage: IPFS integration for document storage
• Features:
  • Responsive web design
  • Multi-role interfaces (User, Bank, Admin)
  • Real-time blockchain interaction
  • Document upload and encryption
  • Modern UI/UX with Material Design

Key Technologies

• Blockchain: Ethereum, Solidity 0.8.19
• Frontend: React, Material-UI, ethers.js
• Storage: IPFS, Web3.Storage
• Development: Hardhat, Ganache
• Cryptography: RSA encryption for sensitive data
• Testing: Hardhat testing framework

📋 Prerequisites

• Node.js: Version 16.x (Required)
• MetaMask: Browser extension for wallet connection
• Ganache: Local Ethereum blockchain (for development)
• Git: For version control

🚀 Quick Start

1. Clone the Repository

git clone [repository-url]
cd decentralized-kyc

2. Smart Contract Setup

cd smart_contract
npm install

# Deploy to local Ganache
npm run deploy ganache

# Alternative Hardhat commands
npx hardhat compile
npx hardhat test
npx hardhat node

3. Frontend Setup

cd ../frontend
npm install

# Update contract details in utils/constants.js
# Set the deployed contract address and ensure ABI is updated

npm start

4. Configuration

1. Start Ganache: Run local Ethereum blockchain
2. Deploy Contract: Use the deploy script to deploy the smart contract
3. Update Constants: Update frontend/src/utils/constants.js with:
   • Contract address from deployment
   • Ensure ABI is current
4. Connect MetaMask: Import Ganache accounts to MetaMask
5. Access Application: Open http://localhost:3000

🔧 Development Workflow

Smart Contract Development

cd smart_contract

# Compile contracts
npx hardhat compile

# Run tests
npx hardhat test

# Deploy to local network
npx hardhat run scripts/deploy.js --network localhost

# Deploy to specific network
npm run deploy [network-name]

Frontend Development

cd frontend

# Start development server
npm start

# Build for production
npm run build

# Run tests
npm test

📱 User Flows

Customer Journey

1. Connect Wallet → MetaMask integration
2. Register Account → Provide personal information
3. Upload KYC Documents → Passport, citizenship documents
4. Request Verification → Submit to chosen bank
5. Track Status → Monitor verification progress
6. Grant Access → Allow banks to access verified data

Bank Journey

1. Connect Wallet → MetaMask integration
2. Register Bank → Provide institutional details
3. Admin Verification → Wait for admin approval
4. Manage Clients → View and verify customer KYC
5. Access Requests → Request access to customer data
6. Verification Process → Approve or reject KYC submissions

Admin Journey

1. Connect Wallet → Admin wallet connection
2. Bank Approval → Verify and approve bank registrations
3. Platform Monitoring → Oversee system activity
4. User Management → Monitor user activities

🔐 Security Features

• RSA Encryption: Customer data encrypted with RSA cryptography
• Blockchain Immutability: Tamper-proof record keeping
• Access Control: Role-based permissions (User, Bank, Admin)
• Decentralized Storage: IPFS for secure document storage
• Smart Contract Security: Solidity best practices implemented
• Wallet Integration: Secure MetaMask authentication

🗂️ Project Structure

decentralized-kyc/
├── frontend/                 # React frontend application
│   ├── src/
│   │   ├── components/      # React components
│   │   │   ├── admin/       # Admin interface
│   │   │   ├── bank/        # Bank interface
│   │   │   ├── user/        # User interface
│   │   │   └── LandingPage/ # Landing page
│   │   ├── context/         # React context (blockchain integration)
│   │   ├── utils/           # Utilities and constants
│   │   └── theme/           # UI theme configuration
│   └── public/              # Static assets
├── smart_contract/          # Ethereum smart contracts
│   ├── contracts/           # Solidity contracts
│   ├── scripts/             # Deployment scripts
│   ├── test/                # Contract tests
│   └── hardhat.config.js    # Hardhat configuration
└── docs/                    # Documentation and diagrams

🧪 Testing

Smart Contract Tests

cd smart_contract
npx hardhat test

Frontend Tests

cd frontend
npm test

🌐 Deployment

Local Development

1. Start Ganache or Hardhat node
2. Deploy contracts locally
3. Start frontend development server

Testnet Deployment

1. Configure network in hardhat.config.js
2. Deploy to testnet: npm run deploy [network]
3. Update frontend constants with new contract address
4. Deploy frontend to hosting service

🤝 Contributing

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🆘 Troubleshooting

Common Issues

MetaMask Connection Issues

• Ensure MetaMask is installed and unlocked
• Check network configuration (should match your deployment)
• Verify account has sufficient ETH for gas fees

Smart Contract Deployment Issues

• Verify Ganache is running on correct port
• Check hardhat.config.js network settings
• Ensure sufficient ETH in deployment account

Frontend Connection Issues

• Verify contract address in constants.js
• Check ABI is current after contract updates
• Ensure IPFS connection is properly configured

Support

For issues and questions:

1. Check existing issues in the repository
2. Create a new issue with detailed description
3. Include error messages and environment details

🚀 Future Enhancements

• Multi-chain Support: Support for other blockchains (Polygon, BSC)
• Mobile Application: React Native mobile app
• Advanced Analytics: Enhanced reporting and analytics
• Document Templates: Standardized KYC document templates
• API Integration: RESTful API for third-party integrations
• Compliance Features: Enhanced regulatory compliance tools

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Note: This project is for educational and demonstration purposes. For production use, ensure proper security audits and compliance with local regulations.