> And, ‘How do you know that’s the version that was published, when it was published?’

That is just about the only valid purpose for using centralized blockchains (no matter what kind, even a git repository is a blockchain!).

A version label in the document, digital signatures and a halfway decent PKI scheme work fine for the "authenticity" part, but they have the downside that should the key material be compromised, no one can guarantee that authenticity any more.