Buterin: Obfuscation could enable private on-chain voting

Vitalik Buterin published a blog essay on Monday proposing that indistinguishability obfuscation, or iO, could enable private, collusion‑resistant voting on a blockchain without relying on a trusted group to manage and reveal ballots. He wrote the design might allow results with “almost no trust assumption.”

Buterin explained iO as a form of cryptography that turns a program into a protected object: anyone can run the program and see its outputs, but observers cannot inspect its internal code or extract the data it holds. In his voting example, an obfuscated program would accept encrypted ballots, process them and reveal only the final tally.

Under that model, a protected program would replace threshold committees that jointly hold decryption keys. The program would embed the decryption and tallying rules so operators would not need access to raw ballots or secret keys to produce a result.

Buterin wrote blockchains would still be necessary because an obfuscated program cannot prevent copying or independently update shared data. A ledger would record ballots, store state and provide a way to verify that the program ran correctly and produced the declared outcome.

He warned the approach is not ready for production. He wrote the most conservative iO constructions require what he called “galactic” amounts of computation. Faster constructions depend on security assumptions that have not been widely tested, making the technique a research topic rather than a deployment-ready solution.

The essay expands on a proposal in his October 2024 Ethereum roadmap that connected iO to private voting. In April 2025 he proposed nearer-term wallet-level privacy tools and stronger protections against data collection by infrastructure providers used to access Ethereum. On Jan. 30 he allocated 16,384 Ether, about $45 million at the time, to fund projects focused on privacy, open infrastructure and self-sovereign tools.

Buterin detailed possible constructions, the security assumptions they would require and the engineering barriers that remain. He presented iO as a possible long-term path for private on-chain voting and called for further research rather than immediate implementation.