A Trust Certificate certifies that a specific trust attribute has been validated, under defined authority, for a defined purpose. An AI Trust Certificate applies the same model to a machine actor: it would certify who authorised an AI system, what authority was delegated to it, what limitations apply, and whether that authority remains valid at the time it acts.
Why this follows from the rest of the model
This is not a separate concept from a Trust Certificate so much as its application to Machine Authority and Delegated Authority: the same requirement — that authority must be established and independently checkable before it is exercised — extended to cover an AI agent rather than a person or organisation.
This is an early, conceptual treatment. It describes a proposed model, not an existing standard or a claim about current industry practice — the distinction between existing identity/authorisation technology, emerging standards, and this proposed model still needs to be worked through in more depth.