You seem to assume that you're in a situation where, by assumption, cash fails but the whole computer and phone network infrastructure "just works". That seems unlikely. "Cash" is on your phone these days. I haven't spent a physical dollar bill in weeks.
SWIFT (Society for Worldwide Interbank Financial Telecommunication) moves a trillion dollars a week. I can't see the distributed blockchain handling that many transactions.
SWIFT (Society for Worldwide Interbank Financial Telecommunication) moves a trillion dollars a week. I can't see the distributed blockchain handling that many transactions.