RFC 9421 signed requests

Agentic Commerce 101: How Agents Buy and Sell — lesson 11 of 20 (DEFINITION)

HTTP Message Signatures: the agent signs a canonical set of headers with its private key, and you verify against its published public key. Same idea as SSL for a request body — it proves origin and blocks replay. This is the trust primitive of the machine economy.

Source: IETF RFC 9421

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