Ethereum co-founder Vitalik Buterin published a technical essay on Monday laying out how a form of advanced cryptography called indistinguishability obfuscation, known as iO, could one day allow people to vote privately on a blockchain without relying on any trusted committee to manage or reveal results.
What indistinguishability obfuscation does
Buterin described iO as a technique that converts software into a protected program. Anyone can run the program and receive its intended output, but no one can inspect the internal code or extract data stored inside it. He framed the concept as hiding the code itself rather than the information the code processes.
Applied to onchain voting, Buterin said an obfuscated program could hold all the logic needed to process encrypted ballots and produce a final tally, without exposing any individual vote. The critical difference from current systems is the elimination of threshold committees, groups of operators who collectively hold decryption keys and must behave honestly for results to remain private and unmanipulated.
Buterin argued that removing that human dependency would make decentralized governance harder to manipulate, cut the risk of insider interference, and let voters participate without revealing how they voted.
Why the technology is not ready
Despite the conceptual appeal, Buterin was clear that iO remains impractical today. He said the most conservative constructions demand what he described as galactic amounts of computation. Faster approaches exist but rely on security assumptions that have not been sufficiently tested, making the entire concept a long-term research direction rather than anything close to a deployable system.
Buterin also noted that blockchains would still be required even in an iO-based system, because an obfuscated program cannot prevent itself from being copied or independently maintain state changes over time.
How this fits Buterin’s broader privacy agenda
This is not the first time Buterin has connected iO to voting privacy. In his Ethereum roadmap published in October 2024 he flagged the approach as a route to stronger privacy and coercion resistance. His June 2026 essay expands that earlier mention by examining the cryptographic construction in detail, the security assumptions it requires, and the technical barriers still blocking practical deployment.
In April 2025 Buterin separately proposed a more immediate privacy roadmap for Ethereum, calling for privacy tools to be built directly into existing wallets and for stronger protections against data collection by the infrastructure providers wallets use to connect to the network.
Buterin has also backed privacy work with personal funds. On January 30 he earmarked 16,384 Ether, worth approximately 45 million dollars at the time, to fund initiatives focused on privacy, open infrastructure, and self-sovereign tools.
