Such usecases actually run into an economic problem. You can't just create a proof-of-work blockchain to hold your records. That blockchain also have to be a

Such usecases actually run into an economic problem. You can't just create a proof-of-work blockchain to hold your records. That blockchain also have to be a functioning economy with a large enough market cap to pay out mining rewards that are large enough to make a 51% attack economically nonviable. If you fail to do so, or the economy falls apart, all tamper-resistance just disappears. It actually ends up being cheaper just to trust a group of authorities, and pay auditors to make sure they are being trustworthy.