Seal · Card · Passport
Sealed at first hand.
Readable on the secondary market.
An NFC chip proves on every tap that it is the genuine chip and which tap number this is. A card on the bottle carries irreversible indicators for heat and humidity. Every scan is signed and anchored on Solana — building a passport with an unbroken history.
The chip proves authenticity
NTAG 424 DNA. Every tap delivers a fresh checksum and a counter that only goes up. The server is the only place that can verify it.
The card shows the handling
Heat above 40 °C and humidity above 60 % RH change colour irreversibly. The phone camera reads the fields against printed references.
The chain makes it transferable
The server signs only what the chip has proven. The program accepts only what the server has signed. The passport belongs to the bottle, not the chip.