Well, it ain't gonna happen

"..protect them against interference from the federal government."

Firstly is taxation. If that isnt interference, I'll eat my hat.

Secondly, currency is just a tool.

A hammer can be used to build a house, break a window or crush a skull.

All worthwhile tools can be used by their posessers, for good or ill.

As soon as an authority can legislate how a tool can be used, it interfers with the creativity (good or bad) of the posessors/creator of said tool.