If you find a 25 year old buried bucket of Portuguese Escudo, US dollar, and gold, which still spends? Which was cancelled or went to zero? Europe has frequentl

If you find a 25 year old buried bucket of Portuguese Escudo, US dollar, and gold, which still spends? Which was cancelled or went to zero? Europe has frequently cancelled their currencies over past 25 and 100 years. Those who were born into US dollar over past 25 or 100 years may believe fiat currency stays around, but that is a US-centric view. Maybe Austrians have a valid historical concern about cash.