Sam Blackshear is leaving Mysten Labs to join Anthropic as a full-time AI security researcher. The move signals growing concern in tech about the weaponization of artificial intelligence, where attackers are gaining ground faster than defenders can adapt.
Blackshear spent years building blockchain infrastructure at Mysten Labs, the outfit behind the Sui network. His shift to AI security reflects a broader pattern: experienced engineers from crypto and systems-level work are being pulled into AI safety roles. The skill sets overlap more than people realize. Both domains require thinking about adversarial scenarios, protocol design under uncertainty, and defending against edge cases that could cascade into systemic failures.
Why security shops are racing to hire
Anthropic has been quietly aggressive about recruiting talent from outside the traditional AI research bubble. They're not just hiring PhD researchers anymore. They're bringing in people who've shipped production systems, debugged distributed networks, and made decisions when the stakes were high. Blackshear fits that profile. His experience with move semantics and formal verification in blockchain environments gives him mental models that apply directly to AI alignment and safety testing.
The timing matters. Large language models are moving faster than anyone predicted. Vulnerabilities that seemed theoretical two years ago are now practical attack vectors. Jailbreaks, prompt injection, model extraction, data poisoning. The surface area for mischief keeps expanding, and the defenders are perpetually one step behind. Hiring someone like Blackshear, who has shipped code under pressure and managed protocol upgrades in production, adds a dimension of practical hardening that academic papers alone can't deliver.
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