The federal government is what makes USD legal tender, and this clause does not restrict the federal government.
Standing would presumably be with the party which refused bitcoin payment in satisfaction of a debt.
Standing would presumably be with the party which refused bitcoin payment in satisfaction of a debt.
Edit: I'm serious. I'm not saying that's a realistic option.
For example: there is no gold standard set by the Federal Reserve, nor any conceptual relevance of gold to the value of the dollar, since the 1970s.