Fiduciary Handshake Protocol

The Fiduciary Handshake Protocol (FHP) establishes the foundational trust parameters between the merchant, the autonomous agent, and the settlement rail. FHP strictly enforces fiduciary obligations at the exact moment of autonomous purchase, defining the handshake sequence that authenticates an agent's authorization to spend capital on behalf of a human user.

FHP operates as a secure, bi-directional handshake mechanism executed prior to the commit phase of any transaction. It requires the autonomous agent to present a cryptographically signed verifiable credential proving its identity, session validity, and the explicit consent policies attached to its current operation.

A core function of FHP is the enforcement of user-defined constraints. FHP interrogates the agent's payload to verify that the proposed transaction falls within the established spending limits, category restrictions, and temporal authorization windows. Transactions exceeding these boundaries are automatically rejected with a specific FHP error code.

By establishing clear fiduciary boundaries, FHP protects both the merchant platform and the end-user. Merchants are indemnified against chargebacks originating from "rogue agent" behavior, provided the FHP handshake was fully validated. Conversely, users are protected against agent overspending, as FHP acts as a hard gatekeeper enforcing their pre-set financial parameters.

Every successful FHP handshake generates an immutable audit receipt containing the agent's signature, the merchant's acknowledgment, and the timestamp of authorization. This audit trail is retained in accordance with financial compliance regulations and is accessible for dispute resolution or user review.