Sam Blackshear, Co-founder and CTO of Mysten Labs and the creator of the Transfer programming language, introduced on Thursday that he might be leaving Mysten Labs to hitch Anthropic, the place he’ll work in defensive safety analysis.
The transfer marks a notable management transition at Mysten Labs, the corporate tied to the Layer 1 blockchain Sui, whereas bringing one of many Transfer ecosystem’s key engineers to AI safety. On Anthropic’s facet, Blackshear’s transition to defensive safety analysis comes as the corporate expands its AI safety efforts—an more and more essential area as AI fashions are extra broadly utilized in software program growth and testing.
Sam Blackshear Confirms Transfer to Anthropic
Blackshear confirmed his transition to Anthropic in a short submit on X, stating that he’ll work on defensive safety analysis. He has not launched additional particulars relating to his official title, crew, or beginning date for the brand new position.
I’m leaving Mysten Labs and becoming a member of Anthropic to work on defensive safety analysis.
— Sam Blackshear (@b1ackd0g) August 5, 2026
Blackshear is likely one of the most distinguished technical figures related to the Sui ecosystem. Earlier than co-founding Mysten Labs, he labored at Meta on the Diem mission, the place he created Transfer—a programming language designed for digital property and good contracts.
At Mysten, Blackshear served as Co-founder and CTO, and was certainly one of 5 founding members alongside Evan Cheng, Adeniyi Abiodun, Kostas Chalkias, and George Danezis. His transfer to Anthropic is subsequently not simply a person profession change, but additionally a shift for a key technical determine deeply tied to the Transfer and Sui story from the early days.
Evan Cheng Steps Again Into CTO Position
Shortly after Blackshear’s announcement, Evan Cheng said he could be “returning to my roots” by main engineering groups and the research-to-engineering-to-product pipeline. Cheng added that, as CTO and CEO, he might be nearer to the technical work and straight concerned in operations.
This can be a notable element for the Sui neighborhood because it helps slim the knowledge hole following the departure of a founding CTO. Cheng isn’t solely CEO of Mysten Labs but additionally a veteran engineer who beforehand served as Director of R&D at Meta’s Novi Monetary and earlier labored at Apple, the place he contributed to the LLVM compiler infrastructure.
Cheng moving into the twin position of CTO helps Mysten preserve continuity in technical management, at the very least through the transition interval. As a substitute of appointing a brand new technical chief from the skin, Mysten presently has Cheng straight overseeing each company operations and technical path.
Mysten’s Founders Sign Continuity
Responses from Mysten’s founding crew sign a need to take care of stability following Blackshear’s announcement. Adeniyi Abiodun, Co-founder and CPO of Mysten Labs, congratulated Blackshear and expressed happiness for his colleague’s subsequent chapter.
Abiodun additionally famous that he’ll proceed collaborating with Evan Cheng as Cheng steps into the CTO position, whereas referencing Kostas Chalkias and George Danezis throughout the crew driving the corporate’s subsequent part. For Mysten, this emphasizes that the rest of the founding crew stays actively concerned within the transition.
Can’t say sufficient good issues about @b1ackd0g. Nice buddy, nice colleague, and genuinely comfortable for his subsequent chapter.
Tremendous pumped to companion with @EvanWeb3 once more as he steps in as CTO. He, @kostascrypto, @GDanezis and I are already executing hand in hand on what comes subsequent for…
— Adeniyi.sui (@EmanAbio) August 6, 2026
Why the Departure Issues for Sui
Blackshear’s position is especially vital for Sui as a result of Transfer is a core aspect of the community’s technical structure. Sui mainnet launched on Could 3, 2023; the SUI token is used for fuel charges, staking, and community governance, with a complete provide capped at 10 billion tokens.
Based on DeFiLlama, Sui presently holds roughly $408 million in complete worth locked in DeFi, a stablecoin market cap of round $436.4 million, 174,927 lively addresses, and 13.31 million transactions in 24 hours. CoinGecko recorded SUI buying and selling round $0.68 on the identical day, with a market cap of roughly $2.8 billion and 24-hour quantity of round $167 million.
Given Sui’s present scale, the departure of a technical determine tied to Transfer from the early days is notable information. Nonetheless, Blackshear’s exit doesn’t suggest fast protocol modifications: Transfer has advanced past a single particular person, whereas Sui continues to function with unbiased engineering groups, validators, and on-chain functions. Mysten has not but introduced a timeline for Cheng’s tenure as CTO, nor any modifications to technical priorities resembling Transfer, Walrus, or DeepBook.
Anthropic Deepens Its AI Safety Push
On Anthropic’s facet, Blackshear becoming a member of defensive safety analysis coincides with the corporate’s growth of merchandise and initiatives associated to cybersecurity. On April 30, 2026, Anthropic launched Claude Safety in public beta for Claude Enterprise clients, enabling code scanning for vulnerabilities and patch suggestions powered by Claude fashions.
The corporate can also be rolling out Undertaking Glasswing, an initiative utilizing frontier AI to safeguard essential software program. In a Could 22 replace, Anthropic said that Undertaking Glasswing and round 50 companions had recognized over 10,000 high- or critical-severity vulnerabilities; by June 2, this system expanded to roughly 150 organizations throughout greater than 15 nations.
Along with his background in Transfer and good contract safety, Blackshear brings to Anthropic expertise from an atmosphere the place code is usually public, property maintain real-world worth, and logic flaws can result in fast loss. This distinction makes the transition from blockchain infrastructure to AI safety notably intriguing, moderately than a routine personnel change between two tech firms.
