The encryption signature is partially based on the tag's unique 7-byte serial number (UID), which is hardcoded into the chip during manufacturing. This prevents simple bit-for-bit copying from one tag to another without recalculating the encryption.
Because amiibo use standard chips, their raw data could easily be cloned if not for Nintendo's security layers. amiibo encryption key
This section stores game-specific progress, such as Super Smash Bros. fighter levels or nicknames registered in System Settings Legal and Technical Considerations The encryption signature is partially based on the