Ask HN: What are real-life useful use-cases for blockchain (not currencies)?

I am sometimes overwhelmed by people's enthusiasm when it comes to blockchain. I have seen a project using Hyperledger [https://www.hyperledger.org/] as a plug-in alternative for an RDBMS but one party controlled the one node the system ran on.

Do some of you have non-confidential (useful!) use cases for blockchain databases to share?