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Proof of Action

Canonical definition (Arco Lexicon)

The immutable ledger of every agentic decision and handoff in an Arco business — structured so that an auditor can replay the company's operations in sequence and verify that every action was within the system's defined governance parameters.

Extended Definition​

Proof of Action is the operational protocol that makes Deterministic Logging useful to an acquirer. Logging every decision is a technical practice. Structuring those logs so that an external party can navigate them, replay operations in sequence, and verify governance compliance is a protocol — a deliberate design decision about what gets recorded, in what format, in what sequence, and with what access controls. A traditional due diligence process reconstructs how a business operates through document review, employee interviews, and management presentations. The process is expensive, slow, and dependent on the cooperation and accuracy of the people being interviewed. It is also inherently incomplete: institutional knowledge held in individual employees' heads cannot be fully externalised in a due diligence process, which is the mechanism by which Key-Man Risk becomes a risk premium in the valuation. Proof of Action makes that reconstruction unnecessary. The acquirer does not interview the team to understand how the system works. They review the ledger. The ledger is complete. The team's explanations are supplementary rather than primary.

In the Log​

First used: 2026-03-25

Part of the Arco Lexicon Ecosystem — maintained by Arco Venture Studio