There is literally zero application or real world usage for "blockchain" outside of currency. Anybody claiming otherwise is a deceiving you, or being deceived themselves.

There's this thing where there's swathes of people running around calling themselves "blockchain developers", or people wanting a "blockchain engineer", but basically nobody can describe what this actually entails. What happens in reality is that you make a bunch of handwavey statements about how this can be done better with a block chain, make a proof of concept in whatever the most hipster language that looks sort of interesting, but has nothing at all under the hood, and then move on.

For "blockchain" to be applicable, you have to acknowledge that you've no other solution to trust or maintainability than to use the most expensive key value store in-existence, with huge limitations, probabilistic integrity, and immense developmental and operational cost. When you hear of some large company replacing all of their infrastructure for tracking packages or whatever with "the blockchain", you should interpret this as an admission that they can't run a copy of postgresql safety and are looking for a hyped up brogrammer to make something flashy sounding instead.