# Octant Introduces ZK Vote Coprocessor

*A trustless vote-tallying system that runs quadratic funding rounds onchain without a privileged admin. *

By [ETH Daily](https://ethdaily.io) · 2026-06-09

octant, zk, quadratic-funding, public-goods, succinct, sp1, zkvm

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Octant introduced its ZK Vote Coprocessor, a system that runs trustless quadratic funding tallying onchain without a privileged admin. The coprocessor is built on [Succinct's SP1 zkVM](https://ethdaily.io/706), which verifies the full vote computation and produces a proof that is checked directly on Ethereum.

Under the new system, voters sign gasless EIP-712 ballots and submit them to a sequencer. When a round closes, all ballots are posted to Ethereum as a blob. The zkVM then verifies signatures, removes duplicate votes by nonce, enforces per-voter budgets, and computes the proper quadratic funding allocation. The resulting proof is submitted onchain and checked by a TallyVerifier contract.

Once the proof is verified, valid results are recorded permanently and distributions become claimable directly, without further action from Octant. The design removes the need to trust an operator to tally votes honestly, replacing administrative discretion with a verifiable computation anchored to Ethereum.

Two limitations remain in the current version. Voter addresses and ballot choices are public rather than private, so the system does not yet support private voting. The sequencer can also omit ballots, though it cannot forge them. Octant plans to address both privacy and full trustlessness in future iterations.

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*Originally published on [ETH Daily](https://ethdaily.io/octant-introduces-zk-vote-coprocessor)*