Proof of ownership

Providing a simple, “IRL” and mobile friendly way for a user to prove the ownership of a wallet. This would allow wallet owners to prove they own it’s contents without disclosing any sensitive information, much like the message signing flow on desktop MetaMask.
One way this could potentially work would be for the account/MetaMask user to scan a QR code with the message they would sign, and allow the other party to again scan the result of the operation by displaying another QR code.

Allow a NFT holder, for instance, to get access to an event, by validating they own the wallet where they NFT is.