This paper introduces the AIVO Standard, an external AI reliance evidence standard designed to govern how organizations authorize, document, and defend reliance on AI-mediated representations generated by third-party AI systems. The AIVO Standard does not sit in the inference path, does not control or evaluate model behavior, and does not record model reasoning or internal decision logic. Instead, it produces a time-indexed evidentiary reliance record that binds an external AI output to the organization’s governance state and authorization at the moment reliance occurred.