Mysten Labs CTO Sam Blackshear joins Anthropic for AI security work
Sam Blackshear, co-founder and CTO of Mysten Labs, the creator of Sui, steps down to join Anthropic’s defensive security research, citing a passion for hands‑on work and new domains. CEO Evan Cheng will set technical vision; Blackshear remains advisor to Mysten, Sui, and the Move Foundation.
Quick Take
Sam Blackshear departs Mysten Labs after co‑founding it in 2021 to join Anthropic.
He will focus on defensive AI security amid rising attacks on blockchain infrastructure.
CEO Evan Cheng will take over the technical vision for Mysten going forward.
Blackshear stays as a close advisor to both Mysten and the Sui ecosystem.
Market Impact Analysis
NeutralExecutive departure could raise concerns about Sui’s technical future, but he remains advisor, limiting downside.
Speculation Analysis
Key Takeaways
- Sam Blackshear leaves Mysten Labs CTO role to join Anthropic's defensive AI security team, citing a shift in attacker-defender dynamics.
- CEO Evan Cheng will lead Mysten's technical direction; Blackshear remains an advisor, minimizing disruption to Sui development.
- The move highlights growing AI security threats in crypto, as Anthropic's defensive research could influence blockchain protection standards.
What Happened
Mysten Labs co-founder and CTO Sam Blackshear announced on August 6 that he is stepping down to join Anthropic, where he will focus on defensive AI security research. Blackshear co-founded Mysten in September 2021 with four former Meta executives, creating the Sui blockchain. In his statement, Blackshear said he was happiest doing hands-on technical work and exploring new problem domains, describing the opportunity at Anthropic as a chance to address the shifting balance between attackers and defenders in cybersecurity. His departure comes amid increasing use of AI to automate attacks on blockchain infrastructure, making his new role particularly timely. Evan Cheng, Mysten’s CEO and co-founder, will take over setting the technical vision for the company, while Blackshear remains closely involved as an advisor to both Mysten and the Sui ecosystem.
The Numbers
Blackshear’s tenure at Mysten Labs spanned nearly five years, from the company’s founding in September 2021 to his departure in August 2026. He was one of five co-founders, all formerly at Meta’s Novi project. Mysten Labs has been a key player in the layer-1 blockchain space, with Sui known for its Move programming language. Blackshear’s new role at Anthropic, a leading AI safety and research firm, puts him at the center of defensive AI work—a field gaining urgency as blockchain hacks grow more sophisticated. Despite the CTO transition, the advisory arrangement means Blackshear’s expertise will continue to guide Sui’s technical direction and the Move Foundation’s evolution.
Why It Happened
Blackshear’s decision stems from a personal passion for deep technical work and a desire to confront new challenges. He noted that the balance of power in security is shifting, with AI arming attackers with faster tools for vulnerability detection and phishing. By joining Anthropic, Blackshear aims to bolster the defensive side. This move reflects a broader trend of crypto talent migrating to AI firms, as the two sectors increasingly intersect. For Mysten, it’s a natural transition—Cheng, a co-founder, already shared technical leadership, and Blackshear’s advisory role ensures Sui’s roadmap remains steady.
Broader Impact
The departure underscores the growing gravitational pull of AI on top crypto developers. As AI-driven attacks on blockchains rise, defensive security research becomes critical for the industry. Blackshear’s move could lead to cross-pollination between AI safety and blockchain security, potentially bringing cutting-edge AI defenses to Sui and other networks. For Mysten, while Cheng’s expanded role introduces a slight uncertainty, the continuity of Blackshear’s advisory position mitigates immediate risk, keeping Sui on track.
What to Watch Next
- Monitor any shifts in Sui’s development roadmap or technical priorities now that Evan Cheng has full control of the vision.
- Watch for Blackshear’s research outputs at Anthropic that could be applied to blockchain security, potentially setting new standards.
- Track whether other high-profile crypto developers follow suit into AI, signaling a broader talent realignment.
This article is for informational purposes only and does not constitute financial advice.
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