Algorand Foundation launched AC2, an open protocol that lets AI agents request sensitive actions without holding users' private keys or API credentials, on August 25. The specification and reference implementation are open-source. AC2 combines DIDComm v2.0, WebAuthn/FIDO2, and WebRTC DataChannels, letting users approve agent actions via hardware-bound passkey signatures. It requires no central relay or blockchain, supports on-chain use cases like x402 payments, and can be added via plugin rather than a full stack rewrite.
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