A method of verifying product authenticity includes emitting, by an electromagnetic radiation source in communication with a processor, radiation to heat one or more pieces of ferromagnetic material in or on a product. The method also includes detecting, by a heat sensor in communication with the processor, heat emitted from the one or more pieces of ferromagnetic material that are in or on the product. The method further includes determining, by the processor, if the product is counterfeit based on the detected heat.