GS1 Digital Link: How a Product QR Code Encodes GTIN, Lot, and Serial

1. The URI Pattern

GS1 Digital Link places identifiers in a web address, with each identifier introduced by its Application Identifier: `https://example.com/01/09506000134352/10/LOT123/21/SER456` * 01 is the GTIN. * 10 is the batch or lot. * 21 is the serial number.

2. One Code, Two Jobs

The same symbol can be read by point-of-sale scanners that extract the GTIN, and by consumers whose phones open a product page with ingredients, recycling guidance, or authenticity checks.

3. Implementation Notes

* Use a stable resolver domain you control. * Keep identifiers valid, including the GTIN check digit. * Print to GS1 quality guidance and verify scanning at the point of sale.