@molly0xfff Cryptocurrency is not an issue for me: when asked to explain it, I'll just say "tulips" (the 17th century economic bubble). It might have some niche applications such as currency exchange, where you "hold" crypocurrency for the time needed to complete a currency-exchange transaction, hopefully a few milliseconds but in any case for a short enough time that the value won't change by more than a trivial amount.