I think that's addressing a different problem. There are two distinct issues: 1. Is the data correct? 2. Has the data been changed? For many cases, 1) is not

I think that's addressing a different problem. There are two distinct issues: 1. Is the data correct? 2. Has the data been changed? For many cases, 1) is not solvable in software. I'm not sure I really understand why 2. is something best solved with a blockchain with a private group, but given people who have actually looked into this when I haven't think it's relevant means I'm probably missing something either on the requirements, difficulty to implement or features.