Counterfeit NFC Chips
Counterfeit NFC chips exist on the market, often masquerading as the above-supported NFC chips. The originality signature can be used to identify these counterfeit chips if their originality signature is invalid. While it is currently impossible for anyone outside of NXP to manufacture an NFC chip with a new and valid signature, it is important to note that some highly configurable NFC chips may support UID and signature manipulation. A chip with those features would allow for an exact copy to be made of an existing valid NXP tag and would be undetectable.
The GoToTags Desktop App can validate the originality signature of NFC chips that support the feature.