Is it reasonably possible for a government to block the use of a (any) currency type?

I mean this more towards developed and leading countries rather than the smaller countries that have adopted cryptocurrency use. I think it’s amazing the steps we’re taking, but cautious on what the major ecenomic/trade powers like USA and Europe will do.

Let’s say, for example, that people decided to use specially marked and unique tangible items to conduct transactions - such as particularly designed buttons from a suit blazer, idk. Thing is, people would use this to track their wealth and exchange it between one another. Would it be plausible for the government to step in and say “Hey you can’t pay each other with buttons, you HAVE to use the paper and metal currency which I make. I mandate it, if you use your buttons you will be in legal trouble.”

I hope my question makes sense. Like if people want to use Ethereum as their currency, can they do so no matter what or can the gov’t come along and say all other cryptos are void and we’d have to use one that they make for example.