4. How you verify it
From QR to page
A QR code is printed on the bottle. Point your phone camera at it and a public page opens, with no app to install and no digital wallet. The address looks like this: /b/25B001/12, meaning lot 25B001, bottle number 12.
What you see
- The bottle: number, lot, cultivar and area.
- A badge: verified on the chain or LOTTO RICHIAMATO (lot recalled) with the reason.
- The timeline of the four phases: who acted, when, the photo or document, and the link to the record on the chain.
The three checks
- The registry says so. The page asks the chain whether the lot exists and whether it is recalled.
- The document fingerprint matches. The page recomputes the fingerprint of the report it shows you and compares it with the one written on the chain. If the file had been replaced, the check would fail.
- The bottle number is inside the bottled range. If the lot has 360 bottles, bottle 12 exists and 361 does not: a code copied onto an extra bottle does not pass.
It is like checking a train ticket: the number exists, the stamp is genuine, the seat is really in that carriage.
What "LOTTO RICHIAMATO" means
The producer has flagged a problem on the whole lot. Do not throw anything away on your own: read the reason on the page and follow the producer's instructions.
One limit to know: the check says the registry and the documents match, not that the oil is good. We discuss it in chapter 9 and in the FAQ.
Try it yourself
Ask a friend to read you an address like /b/25B001/12 and tell you which is the bottle and which the lot. Then try /b/25B001/400: where would you expect the check to fail if the lot has 360 bottles?
What you learned
- The QR opens a public page with no app or wallet.
- The three checks: the registry says so, the document fingerprint matches, the number is in range.
- The red badge means the producer recalled the whole lot.