Yeah, a zero knowledge system would mean that the inspector chooses the composition of the foil, and receives a return signal, that only the inspector may inter

Yeah, a zero knowledge system would mean that the inspector chooses the composition of the foil, and receives a return signal, that only the inspector may interpret and verify. Zero knowledge means your peer participates in the authentication without needing you to inform them of your nuclear secrets, and them reading positive communication without needing to tell you a secret. So the inspector should provide the foil sample, and the foil should be comprised of a publicly known composition, meanwhile they should still control a secret of some kind, and use a combination of the additional retained secret, and the exposed material as their own authoritative means of secretly confirming whether they can prove that know the difference between an authentic positive or negative result. This way, the weapons producer cannot forge an arbitrarily desired result, by providing both the means of measurement, and the measured object. The inspector must decide the degree of proof. The manufacturer must submit to a reasonable revelation of partial details. This concept merely has the manufacturer stating that the foil signature is valid, because the foil signature is valid.