Comment: Ok the

(See in situ)

Ok the

Coinage Act of 1792 established the U.S. Mint and regulated the coinage of the United States.

I'm not commenting on what a stable system would be, but only legality.

The Coinage Act is legal because the Constitution gives the Congress the power to coin money and regulate the value thereof.

The States can't coin money. Only the Congress can. The States, however, are to make nothing except gold/silver legal tender. That means if Congress coins money that's not gold/silver the States can't make it legal tender.

Last, people are free to use whatever they want (at least they should be). However, the only "official" money would be gold/silver, because of legal tender laws. Hopefully all that make sense :)