RxChain

Paper and PDF prescriptions can be edited after the fact with nobody the wiser. RxChain makes that kind of tampering mathematically visible.

The problem

Prescriptions pass through several hands — doctor, pharmacist, patient — and every handoff is a point where the record could be altered, lost, or forged, with no reliable way to prove what the original said.

What I built

I led the team and architected the system: prescriptions are stored on IPFS via Pinata, with their content hashes anchored on the Ethereum Sepolia testnet through Solidity smart contracts I engineered, deployed, and verified via Hardhat. Because the hash lives on-chain, any edit to the underlying document changes the hash and immediately breaks verification — tampering isn’t just harder, it’s detectable.

Role-based access control keeps doctors, pharmacists, and patients each seeing only what they should, with MetaMask handling identity at every step.

Outcome

A working, verified proof of concept for tamper-evident prescription handling, with every contract publicly verifiable on Sepolia.