I guess this is a good thing if is protected by the bitcoin blockchain but it can be a bad thing if it is to be protected by a private blockchain.
All blockchains are private. And since this would be sensitive information, you would not want the data to be available to anyone. Besides, people should not use
BTC's blockchain for things it wasn't designed for. There's been one guy who registered the birth of his kid on the blockchain, another one who used it for his marriage... Hey come on, this has to stop! If everyone starts using the blockchain to store his personal info,
BTC is doomed.