Without convenience it will not be successful as a common currency. It does not need convenience to succeed in other ways. For example, as a store of value.

Sorry, I should have been more specific. "Succeed as a common currency" is more-so what I meant, I think the store of value argument stands.

Literally any scarce and durable good can be a store of value. A pound of Osmium is about a million bucks. So building massive server farms to store something equivalent to an inert rock is kind of uninteresting.