Shielded Dialogues #2: Coinholder Voting

[dismad]

In fact, I think something similar is being used for the proposed namada + zcash airdrop!

@earthrise

The proposed fix to that is: instead of revealing your note’s actual nullifier to claim the airdrop reward, you reveal a different kind of nullifier for the note, which is unlikable to the note’s actual nullifier and which is used to prevent double-claiming airdrop rewards. But, since you’re not revealing the actual nullifier, in order to check that your note is unspent at the time of the snapshot, you also need to use a zero-knowledge proof to prove that your nullifier is not in the nullifier set at the time of the snapshot.