no of dollars. money that exists on an electronic (but not distributed) ledger, just like steem or bitcoin (except centralized). WHat, did you think the crypto guys thought of it first? They didn't. All they figured out was how to make it work without a central trusted actor. A FRN is not a dollar. Anymore than a valet ticket is a car. Or those absurd coins you always see pictures of are bitcoins. The real dollar simply exists electronically.

When you give up your real dollar at the bank (the dollar of balance in their electronic ledger) the bank gives you a green valet ticket, that has no value except for the fact that somone can later go back to the bank and present it in exchange for that electronic balance that you gave up.

People deny this, even finance and economics people, but what replaced the gold in the gold standard wasn't fiat currency, it was tick marks in an electronic ledger.

The grocer takes a $100 bill because he knows he can exchange it for something that he considers valuable (a $100 entry in an electronic ledger at his bank). His bank accepts it because they know they can exchange it for a $100 entery in the fed's electronic ledger.