I work in this space and I am hard pressed to see where blockchain could improve patient control of data. The real problem that I have is that health data rules

I work in this space and I am hard pressed to see where blockchain could improve patient control of data. The real problem that I have is that health data rules and workflows are completely unlike any other type of data I have worked with. Ownership of data, attribution of information, interoperability, all of these elements are context dependent. Centralised, independent storage of information so that all healthcare providers (with the patient's permission) can access critical records is a much simpler solution. It is still complex, but at least you don't have the byzantine bullshit of the blockchain sitting beneath it.