BLOCK CHAIN BASED CERTIFICATE VERIFICATION SYSTEM

The rapid digitization of academic records has increased the demand for secure and reliable certificate verification mechanisms. Traditional verification systems rely on centralized databases, which are susceptible to forgery, data manipulation, and administrative delays. To address these challenges, this study proposes a blockchain-based certificate verification system that ensures integrity, transparency, and decentralized validation of academic credentials. The system leverages smart contracts deployed on the Ethereum network to securely record certificate hashes, thereby preventing unauthorized modification or duplication of issued credentials. The proposed framework is implemented as a decentralized application (DApp) with a React-based frontend and Solidity-based backend smart contracts. The system operates using the MetaMask wallet integrated with a Hardhat local Ethereum network for transaction management and testing. It defines two primary roles: an Administrator responsible for issuing and revoking certificates, and a User who verifies credentials using a unique certificate identifier. A smart contract-based revocation and status tracking mechanism is incorporated to enable dynamic certificate lifecycle management. Experimental validation demonstrates that the system enhances trust, reduces verification time, and strengthens protection against certificate fraud while maintaining operational efficiency. Traditional certificate verification methods rely on manual processes, centralized databases, and third-party verification services, which are time-consuming, costly, and vulnerable to tampering.