@ immudb is a database with built-in cryptographic proof and verification. It can track changes in sensitive data and the integrity of the history will be protected by the clients, without the need to trust the server. It can operate as a key-value store or as relational database (SQL).

https://github.com/codenotary/immudb
https://m.rthome.me/media/Rh_x9udhAoy6TovWNFs
https://m.rthome.me/media/ZsiJ1zeLlEHlJbnELFk