Supposing a guy wanted to put a hidden identifier in a product. Would it be
possible to put something such as a chip they use on a dog or cat in there?
It would have to hold up to some VERY substantial use, temperatures,
vibration, etc. I would imagine those used on cats and dogs are a
synthetic, and those might not last. Or maybe just a nameplate may have to
suffice, as a lot of the parts would be able to be disassembled. Or a
stamped SN.

Steve