Anthropic · Claude · Ethereum · GPT · Decrypt
Eth zurich and anthropic published a terrifying paper proving that "practical anonymity" on the internet is officially dead
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They built a fully autonomous ai pipeline that takes your… pic.twitter.com/XMeXifhDf3., Superman September 23, 2026.
Key facts
- Against a pool of 89,000 candidates, the strongest AI method still caught only about half of correct matches at 90% precision
- Researchers built an AI that doxes any "anonymous" reddit account in under a minutes for $2
- In a separate test on transcripts from Anthropic's own interview research with 125 scientists, the AI correctly identified at least 9 people from how they described their work
- In one test, the team gathered 338 users of the mostly pseudonymous Hacker News message board who had linked their LinkedIn profile in their bio, stripped out anything identifying, then asked an AI
Summary
Researchers from ETH Zurich, MATS, and Anthropic built an AI pipeline that matched anonymized Hacker News accounts to real LinkedIn profiles at 90% precision. The attack runs on nothing but web search, embeddings, and reasoning models like GPT-5.2, at a cost of roughly $1 to $4 per target—no hacking or data breach involved. The paper's authors withheld their code, prompts, and every real identity they uncovered, and say the study passed through ETH Zurich's ethics review board before publication. It’s the end of internet anonymity as they know it, according to loads of freaked out social media users who discovered an AI-related study today. The research paper making the rounds on X and Reddit again today is from a study in February, and the gist of the findings is scaring the hell out of internet anons everywhere: AI can figure out who you are from an anonymous account.