Comment by ghthor

You need that text file signed by your previous doctors, and your new doctor needs to be able to verify the public keys of your previous doctors using some type of PKI. You also need to locally manage your health records data, its storage can't be easily automated and paid for. Blockchain solves all of those problems in one nice bundle, it provides PKI, signed log of changes, and distributed automated storage. That's one hell of a feature set.