The impact of our project is the number of users that have uniquely verified for their gitcoin stamp. You can track this on-chain

https://optimistic.etherscan.io/address/0xdD748977BAb5782625AF1466F4C5F02Eb92Fce31

You can also measure the unique verifications in our anonymity set
https://optimistic.etherscan.io/address/0xB1f50c6C34C72346b1229e5C80587D0D659556Fd

Lastly, you can look at the number of sybil attacks blocked by our protocol (to be published after the round).