E-notary

What It Does It is a full-stack Web3 PDF Notary application deployed on the Monad Testnet. Users can upload any PDF document to generate a unique cryptographic hash, which is then permanently and securely timestamped and recorded onto the blockchain via a custom smart contract. What Problem It Solves It solves the issue of document tampering and intellectual property theft. By creating an immutable, decentralized proof-of-existence, anyone can verify the absolute originality and integrity of a file at any time, completely eliminating the need for expensive and centralized third-party notary services. What I Learned I mastered compiling and deploying custom Solidity smart contracts using Remix IDE and connecting them to a frontend via WalletConnect and Rabby Wallet on Monad. I also learned how to debug contract-to-frontend communication, manage environment variables (Secrets) in a full-stack monorepo, and handle testnet gas estimations.