Hello,
You can try checking the NTAG21x to check the originality signature of the device. NTAG21x features a cryptographically supported originality check. With this feature, it is possible to verify with a certain confidence that the tag is using an IC manufactured by NXP Semiconductors.
Each NTAG21x UID is signed with a NXP private key and the resulting 32-byte signature is stored in a hidden part of the NTAG21x memory during IC production.
Still, I believe that capabilities are not available for the iPhone so, the best choice for you would be the NTAG 424.
Sorry for the inconveniences this might cause you.
Regards,
Estephania