> And you need a blockchain for this, to give it the credible neutrality needed for it to be considered something equivalent to real ownership; you can't have it be at the mercy of a single entity.

No, you don't, and yes, you can. And in fact, you yourself say that this is still the case just a few paragraphs earlier:

> People coalesce around this believe, because the edition was released by whoever owns the actual copyright (ideally the artist).