Minimal Anti-Collusion Infrastructure, a set of smart contracts and zero-knowledge techniques designed to reduce bribery and collusion in on-chain voting. It hides individual votes from coercers while allowing public verification of results.
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- MACI was proposed within the Ethereum community to make collusion in voting difficult. It allows voters to change their keys and re-vote in ways that a briber cannot verify, so a promised vote cannot be proven to a coercer.
- A trusted coordinator processes encrypted votes and produces a tally together with zero-knowledge proofs that the tally was computed correctly, which observers can verify without seeing individual votes.