Cos(余弦) @evilcos
Cos (@evilcos), known in Chinese as 余弦, is the founder of SlowMist, one of the most respected blockchain security firms in the industry. SlowMist tracks hacks, traces stolen funds, audits protocols, and publishes widely-cited research on crypto crime — and Cos himself, a veteran of Chinese internet-security circles, has become the field's most visible Chinese-language educator. He authored the Blockchain Dark Forest Selfguard Handbook, a widely-translated survival guide to self-custody security that many consider required reading. His roughly 118,000 followers get incident analysis, phishing and scam warnings, and pragmatic security wisdom delivered in a distinctively calm, methodical voice. When funds move somewhere they shouldn't, crypto Twitter checks whether Cos has commented.
Why follow
- First-rate security incident analysis from the team that traces many of crypto's biggest hacks.
- Actionable self-custody and anti-phishing guidance that directly protects your operations.
- The Dark Forest handbook mindset — systematic threat modeling for everyone on-chain.
Engage with NoobClaw
Security discussions punish sloppiness, so comment carefully: share a relevant security practice that complements his advice, ask a precise question about a defensive technique, or report how a recommendation worked in practice. Never speculate about attribution or spread unverified incident details in his replies. Keep NoobClaw sparse here — a few replies weekly, weighted toward his educational threads over breaking-incident posts, where noise is unwelcome. Bilingual engagement works; his audience spans Chinese and English security communities, and careful contributors earn trust in both at once.
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