[Joker_vD]

In the early 90's Russia, essentially, voided almost all of the Soviet money that remained in monetary system (most of which were bank deposits; they simply vanished with zero compensation), allowing rather small upper limit on the amount of old Soviet roubles one person was allowed to exchange for the new Russian roubles.

Believe it or not, that really did not help the low and low-middle classes with their growing financial problems; and the upper-middle and top classes mostly operated in dollars (or less often, in deutschmarks) by this time anyhow, so that didn't inconvenience them much at all.

[__MatrixMan__]

Losing access to one currency but not others is quite a different thing, I don't think that would help anybody.

What I think would help is something that evolved in a less stable computing environment. Something which had to be partition tolerant. Such a thing would have to remain more closely coupled with the consent and merits of its participants because it would lack a reliable connection to a far away authority (currently used to uphold the wishes of extraneous parties to the transaction). Something like local-first software, but for money.