> If the government told you you're not a person, would that hold?
Governments have always had the ability to dictate who is a citizen and who isn't. Someone born in Angola is not protected by or subject to the US Constitution.
> To me your saying nothing's money unless the government says it is.
Now you're learning! Granted in a democracy the people have a say in what governments do, so if you convince enough people that using bitcoin as a medium of exchange is a good idea then it may eventually be so. Good luck!
Here's what happens right now if you try to pay your taxes in Bitcoin and refuse to convert to dollars:
1. The IRS warns you and charges you back-taxes for the delay
2. If you still refuse to pay after a certain period of time, they audit you and garnish any accounts they have access to until your taxes/back taxes are paid
3. If you have no IRS-accessible accounts, men with guns show up and seize your property, including but not limited to your Bitcoin, to make up the difference.
And for extra points you may get charged with Tax Evasion, which can send you to jail. This entire process may take decades, but it happens.
Sounds like pretty crappy money to me if that's the result of trying to use it at any significant scale.
> In my community there's a whole ecosystem of people trading goods and services in Bitcoin, silver, and Monero.
Great. You and I could also arrange to barter bars of extruded aluminum for goods and services. That doesn't make extruded aluminum money, or at least not "sound money". Note however that in the US those transactions are taxed just like any other, with the amount of tax determined by their value IN DOLLARS. If you're not reporting those transactions you're theoretically subject to the previously mentioned series of events.
Now the IRS can't see literally everything, so you can get away with it to a point. But if Bitcoin/crypto eventually reached the scale where a significant number of economic transactions are transacted in it, one of two things will happen:
1. Enough voters/lobbyists will be convinced of its viability that political changes are made to accept it as currency (unlikely, given the traits of bitcoin)
2. An epic tax-evasion crackdown that will make the conviction of Al Capone look like a Cub Scout picnic.