If you want to be as far as possible to crypto (why would you? I'm just being conversational and slightly contrarian for fun - I hate crypto in general), you could argue that money is largely backed by the opinions of people about the governments claiming to back the currency.

Even with that, though, I'll deal in currnecy any day of the week.

Especially since most people buying crypto view it as a get-rich investment, not as currency. So even at best, it's like a super-volatile stupid gold or something. And at least gold has some inherent value.