> This could be enforced for real-life events by handing out a wristband with a GUID QR code to the first person to demonstrate they possess the private key tha

> This could be enforced for real-life events by handing out a wristband with a GUID QR code to the first person to demonstrate they possess the private key that owns a particular ticket token, then never handing anything out for that token again, and also triggering an alert if the same QR code is ever seen on more than one person This is quite close to what unlock-protocol[1] did for several conferences pre-covid. Overall it worked, though there are some key difficulties: gas prices make interesting on-chain things too expensive for most people, and wallet ergonomics aren’t great for this sort of thing. (I am a former unlock-protocol employee) [1] https://unlock-protocol.com/blog/checking-key-in https://unlock-protocol.com/blog/checking-key-in