Unfortunately it only is useful in proving title when normal processes have failed, and in the places with title proven by a line of titles stretching arbitrarily far back, it's only as good as the proof that got it in the block chain

It's better in places like Australia where title is a record on a government database and block chain would protect against destruction of government records (eg from war or revolution), but there it would probably only be useful if something like the old government regained power (the Nazis had no intention of returning stuff to Jews)

But in places like Australia you wouldn't want to add another step to the users, perhaps it could be a land titles department job

In places with title via history of title I don't think it could defeat a result from a title search, so maybe it'd be next to useless unless it was backed by a court order or some other authoritative full stop