Okay, that is not blockchains for healthcare, that is third party validation for hashing. You're just storing the validation in Bitcoin's public network instead of your own secure servers. There are problems with this:

- You can't guarantee which block the transaction is on [1], which means all your customer encryption is asynchronous (slow).

- Your customers are assuming that you're keeping your private keys safe, which is not any different than trusting a non-bitcoin verification provider.

- The first quantum computer is going to destroy ECDSA, meaning your private keys will be reversed and every health product depending on your service will be trustless. Merkle trees can theoretically be used in a post-quantum world [2], but the method by which you're generating the root for the tree is not safe because you're relying on a network you don't control (Bitcoin).

How is this competitively good for healthcare?

[1] http://www.ibtimes.com/bitcoins-big-problem-transaction-dela...

[2] https://en.wikipedia.org/wiki/Post-quantum_cryptography#Hash...