1. Open the supplier portal, change any value, click Issue & Sign — your browser signs the record with a demo key (a real mill's key never leaves its own vault).
2. Scan the QR with your phone. The QR carries the signed record itself; the verifier checks the signature against the public issuer registry — no account, no app, no server.
3. On the verifier, click Tamper to watch a forged edit get caught by the math, Compare to paper to catch an altered printout, then go back and issue a correction to see how an honest typo is fixed without hiding it.
Aerospace OEM quality leaders, Tier-1 supply-chain risk managers, Chinese raw-material suppliers, investors evaluating the wedge. Spend 60 seconds on each page. Everything is mockup — no real credentials, no real keys.