Secure Access Control and Certificate Validation Using Blockchain and Python

This paper presents a blockchain-based solution for secure access control and certificate validation. Traditional certificate systems are prone to forgery, manipulation, and inefficiencies due to centralized storage and manual verification. The proposed system uses Python and blockchain technology to build a tamper-proof, transparent, decentralized platform for certificate issuance, storage, and verification. The system leverages smart contracts, cryptographic hashing, QR code integration, and OTP-based user authentication to ensure real-time, secure, and scalable certificate management.