Mysten Labs tech chief joins Anthropic to work on AI security
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Cointelegraph by Felix Ng

Mysten Labs co-founder and CTO Sam Blackshear is joining Anthropic to focus on defensive AI security research. CEO Evan Cheng will assume responsibility for the technical vision at Mysten Labs following this transition.
Transitioning from Blockchain to AI Security
In a significant move for the tech industry, Sam Blackshear, the co-founder and Chief Technology Officer of Mysten Labs, has officially announced his departure to join the AI safety and research firm Anthropic. Blackshear, who helped launch Mysten Labs in September 2021 alongside other former Meta executives, was instrumental in the development of the Sui blockchain. His transition marks a notable shift in focus from decentralized ledger technology to the rapidly evolving field of defensive AI security.
The Shifting Balance of Cybersecurity
Blackshear’s decision is rooted in his assessment of the current cybersecurity landscape, which he describes as a period where artificial intelligence is fundamentally altering the balance between attackers and defenders. By joining Anthropic, a company at the forefront of AI safety research, Blackshear aims to engage in hands-on technical work to address these emerging threats. This move underscores a growing trend of seasoned technologists pivoting their expertise toward the existential and technical challenges posed by the rise of generative AI.
Leadership Continuity at Mysten Labs
Following Blackshear’s departure, the leadership structure at Mysten Labs is set to evolve. Evan Cheng, who co-founded the company alongside Blackshear, will step in to lead the technical vision for the organization. As the CEO, Cheng’s expanded role is designed to ensure that the development of the Sui blockchain remains uninterrupted and that the company’s core objectives continue to be met as they navigate the post-Blackshear transition period.
A Career Defined by Technical Exploration
Reflecting on his career trajectory, Blackshear noted that his greatest professional satisfaction has always stemmed from hands-on technical involvement and the exploration of new problem domains. His move to Anthropic is described as a deliberate choice to align his personal interests with the critical task of strengthening security protocols in an era where AI-driven threats are becoming increasingly sophisticated. This shift highlights the fluidity of high-level talent within the tech sector as experts seek to apply their skills to the most pressing technological problems of the day.
Broader Implications for the Tech Industry
This high-profile movement of talent between the blockchain and AI sectors illustrates the cross-pollination of expertise required to build secure digital infrastructures. As AI becomes more deeply integrated into the fabric of the internet, the need for robust defensive research—the specialty Blackshear is now pursuing—has never been greater. The industry will likely continue to see a surge in security-focused roles as companies prioritize safety measures to counteract the potential misuse of AI by malicious actors.
Future Outlook on Defensive AI
Looking ahead, the collaboration between experts like Blackshear and organizations like Anthropic will be pivotal in defining the future of AI safety. As the "attacker vs. defender" dynamic intensifies, the research conducted by these teams will be essential in preventing large-scale vulnerabilities. While Mysten Labs focuses on maintaining its trajectory in the blockchain space under Evan Cheng, the wider tech ecosystem will closely watch how these security advancements influence the next generation of digital platforms.