Medichain

Inspiration

When a 13-year-old boy named Yannick—my neighbor in Douala—was hit by a car, he was rushed to the hospital. The doctors had blood. They had the tools. But they didn’t have one thing: his blood type. His paper medical record had been lost in a hospital transfer. They guessed… and gave him the wrong blood. He didn’t survive.

That tragedy changed me. I couldn’t accept that a missing piece of paper could cost someone their life. So I built Medichain—a decentralized health platform where emergency medical information like blood type, allergies, and weight is securely stored on the blockchain and instantly available to authorized doctors, no matter where the patient is.

Medichain is personal. It's built for communities like mine, where fragile systems put lives at risk. I created it not as a tech showcase, but as a promise: no more preventable deaths from lost data.

If I win this prize, it won’t be for me. It will go toward making sure no child ever dies from being unknown to the system again.

What it does

Medichain is a decentralized platform that allows patients to securely store, access, and share their medical records. It also enables hospitals to view patient histories (with permission), and the accumulated anonymized data can help predict potential epidemics and improve public health planning.

How we built it

e built Medichain using HTML, CSS, and JavaScript for the front end, with Solidity smart contracts deployed on the Ethereum blockchain to handle the storage logic and access control. The platform connects to MetaMask for secure user authentication.

Challenges we ran into

We faced challenges in securely linking blockchain with the front-end UI, ensuring that sensitive health data remains private while still accessible to authorized users, and managing gas costs for interactions on the blockchain.

Accomplishments that we're proud of

We successfully built a working dApp that gives patients control over their medical history while enabling interoperability between healthcare providers. We’re proud of our clean interface and the ability to make health data both secure and usable.

What we learned

We deepened our understanding of decentralized technologies, especially how to manage identity, access, and secure data handling using smart contracts. We also improved our skills in full-stack development using web3 tools.

What's next for Medichain

We plan to integrate decentralized file storage (e.g., IPFS), enable more granular access controls for doctors, and explore AI-driven analytics on anonymized health data to support early detection of public health threats.

Built With

• css3
• html5
• netlify
• react
• sql
• supabase
• typescript