[util]

Having access to more wealth gives people more faith that the government will be around a long time, will not do crazy things with the currency. That's not the same thing as the currency having more intrinsic value. (Also, it would not seem to make sense to talk about backing a currency with taxes denominated in that same currency, would it? But I'm unclear what you meant by "provide value".)

(What I've heard about bitcoin makes me a bit skeptical, but I want to be skeptical for the right reasons.)