It doesn't even do that. If there's complete collapse, there won't be a reliable network to transact over, and not reliable electricity to run the network and do the processing.
What are you thinking of when you say "complete collapse"? Zimbabwe's currency collapsed yet they still had access to electricity and a networks. It sounds like you're envisioning an apocalypse.
What are you thinking of when you say "complete collapse"? Zimbabwe's currency collapsed yet they still had access to electricity and a networks. It sounds like you're envisioning an apocalypse.