Hypothesizing on applying Blockchain to healthcare

Okay, so it’s a ledger that's "secure" and "transparent". hmm. http://blogs.wsj.com/cio/2016/02/02/cio-explainer-what-is-blockchain/

I must come up with a transaction that adds from one side of the ledger to the other and/or subtracts from one side to the other.

Once the transaction is complete, I must make sure the ledger is reconciled and auditable.

How would we put this to use in healthcare?

I assume, possibly wrongly, that the transaction for healthcare would add to a person’s healthcare record or subtract from it.

In other words, I am adding healthcare information to Person A’s record and taking it from the provider that Person A saw?

I’m not sure that is correct but let’s try a use case.

Person A goes to Practice Z and is administered drug Ibuprofen.  My blockchain transaction would look like this: Add drug Ibuprofen to drug list ledger of Person A and subtract drug Ibuprofen from drug order list of Practice Z.

This doesn’t make sense to me unless the ledger already has a record of Practice Z’s drug orders. I think I may be hung up on my far distant knowledge of double-ledger bookkeeping. In double-ledger bookkeeping, every addition to one account must correspond to a subtraction from another account. This doesn’t seem like a starter.  Time to go back and do more reading.