I don't know if I understood correctly. But it might be that the metal pieces in glues are pure random process, and there are no way to reproduce or re-print it

I don't know if I understood correctly. But it might be that the metal pieces in glues are pure random process, and there are no way to reproduce or re-print it again. The metal pieces are then recorded as a key in central database or some sort of AI, just like human fingerprint or retina how are collected and used for authentication???