Medseal: medical records on the blockchain

On 8 November 2025 Medseal, a project I started alone and finished with UWAYEZU Jean Felix and TURIKUMWENIMANA Daniel, took third place and $500 at the Africa Blockchain Festival hackathon. We built it for the hackathon.

The problem

Medical records are some of the most sensitive data that exists. They need to be accurate, they must not be altered after the fact, and the patient they belong to should be able to see them.

How Medseal works

Medseal puts medical records on the Internet Computer (ICP) blockchain, with two clear roles:

• Doctors add records. Only a doctor can create a medical record.
• Patients access them. The patient can view their own records.

Keeping it to those two roles was deliberate. Records on the blockchain are designed not to be quietly changed, and the roles make it clear who writes and who reads.

Building it

I started Medseal alone, and later worked on it with UWAYEZU Jean Felix and TURIKUMWENIMANA Daniel.

This was my third hackathon on ICP. In June 2024 we took third place with an estate planning platform, and in September 2024 we won the ICP Rwanda Hackathon with TransFund.

What I took from it

Simple roles make sensitive systems safer. Doctors write, patients read. The fewer ways there are to touch a record, the easier it is to trust.

Blockchain is a tool, not a product. It fits Medseal because medical records need to be tamper-evident.

Repetition builds depth. Three hackathons on the same platform, in three different domains, taught me more than three platforms would have.