[Certhas]

Hey, this is relative to your needs obviously. An always online trusted third party could be the arxiv server for papers. Or a consortiuum of industry players that don't trust each other and set up a foundation that runs a central database. Or a central bank. Really depends on the problem domain.

And yes, I have talked to people who have proposed to use block chain for storing papers. So while it might be obvious to you that blockchain is not a solution for that, it's still a good paper that lays out in detail what a blackchain does and doesn't do.

https://eprint.iacr.org/2017/375.pdf