MediChain: Blockchain-Based Pharmaceutical Supply Chain Management

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⚙️ Overview

MediChain is a secure, transparent, and efficient blockchain-based system that transforms pharmaceutical supply chain management. Built on Ethereum, this solution provides end-to-end traceability of medical products from manufacturers to patients, eliminating counterfeit drugs and ensuring patient safety.

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✨ Features

• 🔒 Secure Drug Registration: Immutable blockchain ledger for manufacturers
• 🔁 Automated Ownership Transfer: Smart contract-based secure handovers
• 🧭 State Management: Track medicine journey from production to sale
• 📱 QR Code Verification: Instant authentication with a simple scan
• 🏛️ Decentralized Architecture: No single point of failure
• ⏱️ Real-Time Tracking: Monitor the movement of medicines live

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🛠️ Tech Stack

• Blockchain: Ethereum (Private Network), Solidity
• Frontend: HTML, CSS, JavaScript
• Web3 Integration: MetaMask, Web3.js
• Smart Contracts IDE: Remix IDE

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🏗️ System Architecture

MediChain consists of three integrated layers:

1️⃣ Blockchain Network

• Private Ethereum blockchain as the foundational database
• Solidity smart contracts for business logic automation
• Immutable record-keeping with timestamped transactions

2️⃣ Client Communication Layer

• Web3.js for blockchain connectivity
• User interfaces for stakeholder interactions
• MetaMask integration for secure authentication and transaction signing

3️⃣ Application Layer

• HTML-CSS-JavaScript frontend interface
• QR code integration for product verification
• Real-time tracking dashboard

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🧩 Key Modules

🔗 Smart Contract Operations

Smart contracts written in Solidity handle:

• addMedicine() – Register medicines with full traceability
• purchaseMedicine() – Buy securely with automatic ownership transfer
• updateMedicineState() – Update lifecycle state (e.g., Manufactured, In Stock, Sold, Expired)
• getMedicine(), getMedicineState() – Retrieve real-time product and status info

🖥️ Dashboard

• Clean, professional interface modeled after modern commerce platforms
• Track:
  • 🧾 Order history
  • 💊 Total drugs registered
  • 📦 Total stock across batches
  • 🏷️ Total units sold
• Manufacturer insights, quantity analytics, and QR-based lookup tools

🔍 Track Medicine

• Search by medicine ID to view:
  • 🧬 Batch metadata
  • 🏭 Manufacturer identity
  • ⏳ Lifecycle state and timestamps
  • 👤 Current owner in the supply chain
• One-click Verification Report generation for regulators or consumers

🛒 Buy Medicine

• 🔎 Live search and filter system
• 💳 Detailed product cards with dynamic pricing
• ✅ Integrated blockchain validation before purchase
• ⚡ Smooth transaction flow with MetaMask authentication

👥 User Management

• Register as:
  • 🏭 Manufacturer
  • 🚚 Distributor
  • 🏪 Pharmacy
• Role-based login with Ethereum identity
• All interactions are cryptographically signed

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🖼️ Screenshots

🧾 Dashboard Overview

🔍 Track Medicine

🛒 Buy Medicines

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⚡ Performance

Optimized for speed and cost-efficiency:

• 🚀 Transaction Speed: Avg. 100ms response under 500 concurrent users
• ⛽ Gas Optimization: Lower costs via optimized smart contracts
• 📈 Scalability: Supports thousands of participants and millions of transactions
• 🔐 Security: Multi-layer protection against unauthorized access

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🚀 Future Enhancements

• 📊 Advanced Analytics: ML-powered risk prediction
• 🔗 Cross-Chain Integration: Interoperability with other networks
• 📡 Expanded Verification Methods: NFC and RFID support

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👨‍💻 Contributors

• Baivab Sarkar — @ThisIs-Developer
• Ayan Chatterjee — @Ayan123C
• Bhishmadev Ghosh — @bhishma620
• Arpan Bhattacharya — @Arpan550

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📄 License

This project is licensed under the Apache 2.0 License - see the LICENSE file for details.