The problem Ethereum Track: PatientBlock solves

Use Cases: 1) People can use it to share their EHR records to any hospitals, doctors, laboratory, researchers, healthcare people worldwide & can assign for how much time he/she can read your records.
2) The critical database will not be hacked & lost because it will store data on the blockchain network.

3. Digitial criminal activity will be stopped.
4. No hospitals can sell your health records to the third party without your consent.
5. Reduce ongoing maintenance costs.

Challenges we ran into

First of all, web3.js was giving version problems then we try another way for linking. When version changes there are lot of breaking changes happen in codes.