Mysten Labs and Google Cloud launch Verifiable Agent Arbiter to audit AI agents

AI agents are getting permission to book, buy, negotiate and execute on behalf of companies. The awkward question is how anyone proves what those agents actually did. Mysten Labs and Google Cloud think they have an answer. On October 6, 2026, the two companies unveiled the Verifiable Agent Arbiter (VAA), an evidence layer built to let enterprises cryptographically confirm that their AI agents operated inside the authority they were given. How the Verifiable Agent Arbiter works VAA splits agent activity into two tracks. Telemetry such as prompts, outputs, tool calls and policy decisions is stored in Google Cloud Storage buckets that the customer controls. The cryptographic proofs tied to that activity live elsewhere. They are stored on Walrus, Mysten’s decentralized data platform designed for AI workloads, and coordinated on the Sui Layer-1 blockchain. That separation is the core design choice. Sensitive business data stays private in the enterprise’s own cloud environment, while the evidence that it hasn’t been altered sits on infrastructure no single party can quietly edit. Evan Cheng, CEO of Mysten Labs, said VAA is meant to ensure that an AI agent’s authority cannot be exceeded,...