Trusted Execution Environments seal AI workloads at the silicon level. They do not produce legally opposable evidence. When the operator controls the attestation keys, the Hardware Attestation Report remains endogenous to the system under audit — a structural circularity that no firmware update resolves. SOURCE 0 CERTIFIED closes this gap with an independent Governance Proof Layer: T-0 Capture, SHA-256 hash-chaining, dual-QTSP RFC 3161 timestamping under eIDAS 2, and judicial archiving by a Commissaire de Justice. The result is a Dossier de Réalité Historique directly enforceable across the EU under Brussels I bis — satisfying the ex-ante burden of proof imposed by AI Act Article 99.

Modern autonomous systems embed telemetry, tracing, and attestation directly within the infrastructures they observe, collapsing the traditional separation between computation and monitoring. In these environments, every measurement introduces structural perturbation. SOURCE 0 formalizes this condition as a structural property rather than a failure mode. By replacing binary correctness with a probabilistic assurance framework and introducing a tamper-evident Historical Reality Dossier (HRD), this architecture makes observer-execution coupling explicit, measurable, and mathematically bounded under adversarial conditions.