Do I print a piece of paper? Do I show them a picture on my phone or something? Can't the previous owners of the NFT show the same picture? Can't anyone show the same picture on their own phone?
Your NFT could have an associated QR code read at the door. In case of conflict there’s only one owner with access to the associated wallet and will be able to proof ownership via app / website…
I suppose your right that it usually wouldn't matter, but in case of conflict you better be prepared to sign something with your private key. If NFTs make most of society familiar with public and private keys, message signing, etc, it will be a win.
Yep, if someone else tries to access with your ticket you can always sign with your wallet somewhere to resolve the conflict.
We will probably see crypto wallets integrated in our phones and associated OSs pretty soon to make everything smooth.
Or just have your phone broadcast the public keys via radio to a turnstile.
Thus, anyone can make QR codes that show the 2 public keys. It's trivial. This is the "showing a picture" scenerio I mentioned above. Anyone can show the right picture, especially since the picture that needs to be shown is public information.