Ethereum co-founder Vitalik Buterin said on May 28, 2026 that privacy coordination protocol Interfold is the kind of system he has wanted builders to create around the idea of MACI for nearly a decade. In his post, he described it as the generalized form of that vision finally arriving.
Interfold combines encrypted inputs with verifiable outputs
Interfold, previously known as Enclave, is an open-source confidential coordination protocol built by Gnosis Guild. The project is positioned as infrastructure rather than a native-token play, with its focus on a hard problem in blockchain design: keeping user inputs private while still making the final outcome auditable.
According to the material cited by Buterin, the protocol brings together ZK-SNARKs, fully homomorphic encryption or FHE, and threshold cryptography. ZK-SNARKs are used to prove participant eligibility and the correctness of computation. FHE allows computation on data while it remains encrypted. Threshold cryptography spreads decryption power across the Ciphernodes network, reducing dependence on any single trusted party. In practice, users can submit encrypted votes or bids onchain, and the system reveals only the aggregate tally or the winning bid, not the raw underlying data.
Buterin highlighted four security guarantees
Buterin argued that Interfold is especially useful for cases such as DAO governance, sealed-bid auctions, and coercion-resistant voting. He pointed to four properties. First, if voting eligibility is proven with ZK-SNARKs, voter identity can remain anonymous. Second, votes can be posted directly to Ethereum, with cryptographic proofs showing that every published ballot was included in the count, limiting organizer manipulation. Third, ZK over FHE can be used to prove the correctness of the final result. Fourth, as long as the distributed node set satisfies an honest-majority condition under an M-of-N model, the system can stay live and reduce the risk of forced disclosure of voting records.
Current limits remain around expensive computation
Buterin also pointed to a practical constraint. At its current stage, ZK over FHE is best suited to additive tallying. Once multiplication or more complex data operations enter the picture, the computational cost becomes too high. The community is already exploring alternatives based on optimistic computation or slashing mechanisms. Buterin added that, over the long run, a breakthrough in code obfuscation could remove the need to rely on an M-of-N committee.
Interfold has already launched a Launch Primer series to explain how the system works and invite participation. The source material says the protocol has not issued a token. After Buterin’s endorsement, its progress in the FHE privacy segment has drawn broad attention.