There is a GNU project [1] that's basically an electronic cash. It has no restrictions on what you use as currency (fiat, gold, bitcoin). But the government can

There is a GNU project [1] that's basically an electronic cash. It has no restrictions on what you use as currency (fiat, gold, bitcoin). But the government cannot track what you buy. At the same time merchants can be taxed, so there should be no issues from the legislation standpoint. [1]: https://taler.net/en/ https://taler.net/en/