[Digital Today reporter Chi-gyu Hwang] Mysten Labs, the developer of the layer 1 blockchain Sui, said on Tuesday it has unveiled VAA (Verifiable Agent Arbiter), an AI agent activity verification technology it is jointly developing with Google Cloud.

According to the company, businesses can use VAA, which serves as an evidence layer, to prove their AI agents acted within granted permissions. In an environment where agents execute transactions, negotiate with other agents and even handle inter-company work, VAA provides a basis to verify activity records without relying on the platform that created them.

VAA manages AI agent activity records separately from information that proves their integrity. Detailed execution data such as prompts, model outputs, tool calls and policy decisions are stored privately in customer-managed Google Cloud Storage, while cryptographic proofs that establish the integrity of those records are stored on Walrus, a data platform designed for AI environment requirements, and linked and managed through the layer 1 blockchain Sui.

Potential use cases for businesses include situations where two companies' agents trade through the open A2A (Agent2Agent) protocol that Google Cloud developed and donated to the Linux Foundation. If a dispute arises, both sides can reproduce the disputed workflow based on the same verifiable receipts.

Security teams can reconstruct related instructions and policies, decisions, outputs and tool execution histories when they suspect out-of-control or abnormal execution. Stored evidence records can be revalidated under future cryptographic standards, including post-quantum cryptography, while maintaining their linkage to the original records.

VAA connects directly to a payment processing service facilitator called "Sui Agent Payments". Agents can use it to explore services and settle API call costs immediately through the x402 protocol.

Evan Cheng (에반 챙), co-founder and CEO of Mysten Labs, said that as AI agents start making decisions with financial and legal impact, systems are needed to keep them from exceeding granted authority. "To do that, there must be evidence that any counterparty can verify directly," he said. He added that VAA gathers records on the authority allowed to an agent, its actual actions and the outcomes, and links proof information that attests to them to Sui and Walrus. "We designed the two networks to have neutrality and resilience and to support the speed and scale of autonomous agents," he said, adding that the company is applying the technology with Google Cloud to corporate business processes.