Thread

1. piratejon · 1789617453 · focus · HN ↗

   That's really neat! Seems potentially adaptable to paper currency--a verifiable QR code digital signature of the bill's serial number creates a cryptographically hard obstacle to counterfeiting!

   1. lxgr · 1789627633 · focus · HN ↗

      It’s a bunch of static signed data, which is hard to modify but trivial to copy. Not exactly what you’d want for bank notes.

      NFC and a challenge-response protocol could work, though, like e.g. the one used in biometric passports.

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