Ethereum co-founder Vitalik Buterin has challenged internet users to identify an anonymous Ethereum document he says he wrote earlier this decade. Summary Vitalik Buterin asked the internet to identify an anonymous Ethereum document he wrote this decade. The challenge tests whether AI writing analysis can weaken online anonymity for crypto contributors. Related coverage shows Buterin has tied AI, privacy and Ethereum security to wider online debates. The post turns a privacy debate into a public test of AI text analysis. Buterin said there have been claims that AI text analysis will make online anonymity hard to keep. He then wrote, “So let me cannibalize a piece of my own anonymity to do an experiment.” He asked users to find a published Ethereum document that he wrote without using his name. The document has not been named. Buterin described it as a medium-importance Ethereum document and estimated that around 200 to 2,000 Ethereum documents are as important or more important. He added, “Find it,” while noting that he did not know how easy or hard the task would be. There have recently been claims that AI text analysis will make online anonymity untenable.So let me cannibalize a piece of my own anonymity to do an experiment.At some point this decade, I wrote a published document of medium importance to Ethereum – I estimate ~200 to 2000…— vitalik.eth (@VitalikButerin) June 22, 2026 Challenge puts stylometry back in focus The test centers on stylometry, a method that compares writing style, word choice and structure to link text to an author. Researchers and investigators have used this type of analysis for years, but newer AI tools can scan far larger sets of writing faster than manual methods. Buterin is a strong test case because he has a large public writing record. His public work includes blog posts, research notes, Ethereum discussions, social media posts and technical comments. That broad record may give AI tools more material to compare against any anonymous Ethereum text. No one had publicly confirmed a successful identification of the document at press time. That leaves the experiment open and makes the result hard to judge until Buterin or another reliable source confirms a match. Related Ethereum and AI debate grows The challenge also fits with Buterin’s recent focus on AI safety and privacy. As crypto.news earlier reported, Buterin urged a local-first approach to AI, warning that cloud-based tools can expose user data and create risks from leaks, manipulation and unwanted actions. He has also linked AI to Ethereum development. crypto.news reported in May that Buterin said AI-assisted formal verification could become the “final form” of software development. That report noted his view that AI could help Ethereum ship code with machine-checkable proofs of correctness. The latest test looks at another side of AI. Instead of using AI to improve code or security checks, it asks whether AI can weaken anonymity by finding a writer behind a text. For Ethereum, that matters because many contributors use pseudonyms when they write, build or discuss protocol ideas. Privacy remains central to Ethereum discussions The experiment also comes after crypto.news reported that Buterin mapped a three-step Ethereum privacy upgrade in May. That plan focused on account abstraction with FOCIL, keyed nonces and access-layer work to reduce metadata leaks and censorship risks. Those privacy efforts deal mainly with transactions and user activity. Buterin’s latest test moves the privacy debate into authorship. It asks whether writing style itself can become a data trail, even when a person avoids using a real name. For now, the challenge has no confirmed answer. It may show that AI can trace pseudonymous authors through writing patterns, or it may show that anonymity still holds when the search area is large. Either outcome would add fresh context to the wider debate over AI, privacy and Ethereum’s open contributor culture.
