I'm not sure about the medical records thing, but I see a lot of potential in the platform for training machine learning algorithms. Today all this coin mining going on is such a waste of resources. It would be great if those resources were spent in useful computations for society.
Have you considered offering a more general platform, not necessarily linked to medical, that offers researchers/companies compute power that they can just pay to use (like a cloud that uses the miner's machines), and people with the right hardware would have a way to rent out their compute power when not used?
Yes, Skychain can be used as a general platform in the future. Medicine is the most promising area for artificial neural network use. Thats why we have chosen medicine as the main focus of Skychain project. And according IBM research the market for medical artificial intelligence will be more than $200 billion in a few years.