Usual weight, magnetic and maybe inductance tests apply. I also wonder about someone's ability to take slices of the surface of a coin and spread that out over

Usual weight, magnetic and maybe inductance tests apply. I also wonder about someone's ability to take slices of the surface of a coin and spread that out over other cheaper coins. I guess you have to randomize the test, or make sure it covers more than just a couple predictable spots on the coin. Anti-piracy is hard.