The US dollar is backed by the monopoly of force the United States government maintains primarily within its own borders and without as well. The government re

The US dollar is backed by the monopoly of force the United States government maintains primarily within its own borders and without as well. The government requires you pay taxes in USD and will lock you in a cage by force if you do not. It requires that you accept USD as valid for commerce and again will lock you in a cage by force if you do not. If you attempt to counterfeit the currency, again locked in a cage by force. The USD is as strong as the government's monopoly on force. Crypto currency is backed by either nothing ("people faith" waves hands in a rainbow gesture) or some dude named Dan in Ohio or whatever.