I’m no blockchain evangelist in its current state of “value” but this seems like a great test case for resolving the academic or legitimate origin of published material.
As if the current political climate isn't going to result in the sabotage of scientific infrastructure if some state actor decides that it could provide some economic or military advantage. (hello three body problem)
DOIs should have been hashes, that would have been cheaper, more resilient, and more covenient. But sadly librarians tend to re-build paper workflows digitally instead of building digitally native infrastructure.
Blockchain would be fine as a timestamp service to replace publishers, although a consensus based system hosted by the worlds libraries would also be fine for that purpose and require a lot less machinery.