https://blog.beerriot.com/2018/06/05/blockchain-2018-nosql-2009/

“What is NoSQL?” was an impossible question to answer. Beyond, “A database that doesn’t use SQL,” it meant something different to each person involved. “What is Blockchain?” is the same way.

And, of course, haters from all corners, ready to tell you that you don’t need a blockchain, just like there were so many ready to tell you that you didn’t need NoSQL.

The haters are right, as they always are. You could have used literally any database to do the sorts of storage, and storage guarantees, that NoSQL gave you. You can sign data and write updates immutably to get the sorts of auditability and trust that a blockchain gives you.