A reference page mapping plain-language questions about AI compliance, timestamps, logs, and legal opposability to the corresponding term in the SOURCE 0 doctrinal vocabulary — for readers who have the question but not yet the terminology.

Certification of an AI system before deployment and proof that a specific decision was lawful at the moment it occurred are two distinct evidentiary claims, routinely conflated under the same vocabulary of compliance and audit trails. This article sets out where qualified timestamping, blockchain anchoring, and runtime governance stop, and where legal opposability begins.

The distinction between a trace and a proof is not technical. It is jurisdictional. Most organisations generate traces. Very few produce legally opposable proof. SOURCE 0 closes this gap at T‑0, transforming digital records into evidence that carries a legal presumption of integrity.