This is essentially what all "blockchain for healthcare" idealists are trying to advocate/accomplish. With buzzwords like "security" & "interoperability" ... Apple is really pushing for both here (though it would be centralized).

I think the absolute key is to win the users first, and force the industry to adopt a strategy that is best for users vs what is best for Hostpitals/EHRs/Health-Networks.

Interoperability is a beast of a problem to solve for healthcare, and it'll be interesting to see how far Apple is willing to push or disrupt (i.e. standardizing & forcing the adoption of their chosen data formats & integration)

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shameless plug about healthcare & blockchain:

https://hackernoon.com/developing-blockchain-for-healthcare-...