I describe an extension to the ERC-721 standard that adds zk-SNARK verification functionality. Users can claim their tokens and prove ownership in privacy preserving ways, without revealing their identity.

Find the original Ethereum-magicians post here:

https://ethereum-magicians.org/t/eip-idea-extension-for-erc721-zk-snark-compatible-poaps/10064

I implemented and published it on my Github:

https://github.com/Nerolation/zk-PoA-Tokens/tree/main

A more detailed explanation (Medium):

https://medium.com/@toni_w/privacy-preserving-proof-of-owernship-for-attendance-tokens-poa-using-zk-snarks-4fddabedfddb

I am also looking for fellows with experience in the Ethereum development process to potentially draft an EIP on the extension.

Happy to receive feedback!