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Product passports: one per unit you build

Mark a product for passports, and every finished unit freezes its own: what it is made of by mass, a calculated carbon figure, the documents, and a logbook. The QR opens a public page with no login, the customer gets an owner link that shows more, and life cycles record how many times the element has been installed and what state it came down in. Ends on the machine-readable passport, with its hash and signature. Preparation for the EU construction product rules, not an approved passport; the figures are calculated, not verified. English narration, 8 min 00 s.