I always thought this was a dumb thing to say about what backs the USD. Only people who are so thoroughly enthralled with paying tax would see it as a benefit. The Fed prints money endlessly and the great part is you can pay it back to them in taxes. Oh, yippee. Of course they only take their own Mickey Mouse bucks for tax. Same with every other country. I'm fairly sure that's not the reason I ever accepted any USD from anyone.

Bitcoin are backed by the knowledge that the IRS won't even know you have any. Sounds much preferable to me. Especially considering I'm neither American nor live in the US. I haven't paid any tax in over 10 years anyway so it's a perfect fit.