Mysten Labs Co-Founder Sam Blackshear Joins Anthropic for AI Security

Sam Blackshear, a prominent figure in blockchain infrastructure, is leaving his operational role at Mysten Labs to join the AI safety firm Anthropic. The move places one of the industry's most respected security architects at the forefront of the battle against emerging AI-driven cyber threats.

Blackshear, who served as the co-founder and Chief Technology Officer of Mysten Labs, will join Anthropic's defensive security research team. In this new capacity, he will focus on addressing the cybersecurity challenges created by the rapid evolution of artificial intelligence. While stepping down from his executive duties, Blackshear will maintain a connection to his previous venture, remaining an advisor to Mysten Labs and continuing his support for the Move programming language and the Sui blockchain.

A Legacy of Secure Infrastructure

Blackshear's transition comes after years of building high-stakes digital infrastructure. He is widely recognized as the creator of the Move programming language, which was originally developed for Meta's Libra and Diem projects. Move was specifically designed to prioritize safety and predictability in smart contracts, aiming to eliminate common vulnerabilities that have plagued other blockchain ecosystems.

In 2021, Blackshear co-founded Mysten Labs alongside other former Diem engineers. Together, they leveraged the Move language to build the Sui blockchain and additional infrastructure projects, such as Walrus. Following his departure from the CTO role, Mysten Labs CEO Evan Cheng will assume leadership of the company's technical direction.

The Shift Toward AI Defense

This transition highlights a broader trend of top-tier security talent migrating from the blockchain sector into AI safety. The urgency of this shift is driven by the belief that artificial intelligence is fundamentally altering the landscape of digital warfare. According to Blackshear, AI shifts the balance between attackers and defenders, potentially giving malicious actors more powerful tools to automate and scale exploits.

For a company like Anthropic, which positions itself as a safety-first AI lab, recruiting a specialist in formal verification and secure language design is a strategic move. The goal is to develop defensive frameworks that can anticipate and neutralize AI-generated threats before they can be deployed against critical systems.

Future Outlook

As Blackshear integrates into Anthropic, the industry will be watching how his expertise in deterministic, safe programming translates to the more probabilistic world of large language models. While the immediate focus is on defensive research, the long-term implication is a growing convergence between the rigorous security standards of blockchain and the experimental frontier of AI. It remains to be seen how this cross-pollination of talent will influence the next generation of AI guardrails.