🛡️ Evidence Management System powered by Blockchain & AI/ML

A secure, tamper-proof, and intelligent evidence management platform that leverages Blockchain technology for integrity, IPFS for decentralized storage, and AI/ML for real-time intruder identification.
In case of unauthorized access, the system captures a photo of the intruder, checks criminal records, and alerts the authorities.

🚀 Features

• Immutable Blockchain Ledger – Ensures that evidence records cannot be altered or deleted.
• Decentralized Storage with IPFS – Stores large files securely and makes them accessible only to authorized personnel.
• Intruder Detection – Captures photos upon unauthorized access attempts.
• AI/ML Criminal Record Check – Uses facial recognition to match intruder photos with a criminal database.
• Real-Time Alerts – Notifies security authorities in case of a security breach.
• Role-Based Access Control – Only authorized users can view or upload evidence.

🏗️ Tech Stack

Frontend:

• React.js
• Tailwind CSS

Backend:

• Node.js
• Express.js

Blockchain:

• Ethereum Smart Contracts (Solidity)
• Hardhat
• Web3.js

Storage:

• IPFS (InterPlanetary File System)

AI/ML:

• Python (Face Recognition / Deep Learning Models)
• OpenCV
• TensorFlow / PyTorch

Database:

• MongoDB / PostgreSQL

System Design

📌 Project Architecture

UBlock/
├── backend/
│   ├── api/                         # Express-based API service
│   │   ├── server.js                # Entry point for Express server
│   │   ├── routes/                  # API routes for various modules
│   │   │   ├── auth.js              # Authentication & login routes (MongoDB)
│   │   │   ├── evidence.js          # Evidence management routes (MongoDB)
│   │   │   ├── ipfs.js              # New routes for IPFS operations
│   │   │   └── blockchain.js        # Routes for blockchain operations
│   │   ├── models/                  # Database models/schemas
│   │   │   ├── user.model.js        # MongoDB user login info
│   │   │   └── evidence.model.js    # MongoDB evidence documents
│   │   ├── Downloads/               # All the files downloaded from IPFS
│   │   └── config/                  # Configuration files (DB connections, env variables)
│   ├── ml_service/                  # Machine Learning service for intrusion detection
│   │   ├── index.js                 # ML service entry (or proxy to a Python microservice)
│   │   └── models/                  # ML models and related code
│   ├── blockchain/                  # Blockchain integration using Ethereum
│   │   ├── contracts/               # Solidity smart contracts (e.g., EvidenceProtection.sol)
│   │   ├── hardhat.config.js        # Hardhat configuration for contract development
│   │   ├── scripts/                 # Deployment & interaction scripts for contracts
│   │   └── tests/                   # Unit/integration tests for smart contracts
│   ├── ipfs_service/                # New IPFS service for handling file storage
│   │   ├── index.js                 # Entry point for IPFS service
│   │   ├── upload.js                # Functions for uploading file to IPFS
│   │   ├── retrieve.js              # Functions for retrieving files from IPFS
│   │   └── config.js                # Configuration for IPFS (e.g., node address)
│   ├── email_service/               # New email service for handling email operations
│   │   ├── sendEmail.js             # Functions for sending emails
│   │   └── config.js                # Configuration for email service (SMTP settings)
│   └── package.json                 # Node.js package configuration for backend
│
├── frontend/
│   └── react_app/                   # React-based frontend application
│       ├── public/
│       ├── src/
│       │   ├── components/          # Reusable UI components
│       │   ├── pages/               # Page-level components/views
│       │   ├── services/            # API service calls to the backend
│       │   ├── App.js
│       │   └── index.js
│       └── package.json             # Node.js package configuration for frontend
├── docs/                            # Documentation and project artifacts
│   ├── architecture.md
│   ├── requirements.md
│   └── README.md
├── tests/                           # Global tests (unit, integration, end-to-end)
│   ├── backend_tests/
│   ├── frontend_tests/
│   └── blockchain_tests/
└── docker-compose.yml               # Container orchestration for multi-service setup

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⚙️ Installation

1. Clone the Repository

   git clone https://github.com/Sumeets-Code/UBlock.git
   cd UBlock

2. Install Dependencies

   # Backend
   cd backend
   npm install
   
   # Frontend
   cd ../frontend
   npm install

3. Configure Environment Variables Create .env files in both backend and frontend with:

   MONGO_URI=your_mongodb_connection
   INFURA_API_KEY=your_infura_key
   IPFS_API_URL=ipfs_gateway_url
   AI_MODEL_PATH=model_directory_path

4. Deploy Smart Contracts

   cd backend
   npx hardhat run scripts/deploy.js --network <network_name>

5. Run the Project

   # Backend
   cd backend
   npm run dev
   
   # Frontend
   cd ../frontend
   npm start

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🧠 AI/ML Component

The AI/ML module:

• Uses facial recognition to identify intruders.
• Matches the captured face against criminal databases.
• Generates a threat score and sends alerts.

Model trained on LFW Dataset and fine-tuned for law enforcement datasets.

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🔒 Security Measures

• End-to-End Encryption of all data transfers.
• Multi-Signature Authorization for evidence approval.
• Blockchain Audit Trails for transparency.
• Decentralized Access Logs to prevent tampering.

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📸 Screenshots

Unauthorized Access Detected	Evidence Blockchain Record

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📜 License

This project is licensed under the MIT License.

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🤝 Contributors

• Sumeet Bhagat – Backend Development
• Shreyash Gardi & Bhanavi Pandey – Frontend Development
• Anoushka Ingle - Testing

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📬 Contact

For queries, reach out at: 📧 sumeetbhagat1811@gmail.com 🔗 LinkedIn