PX3 stands on its own. You can adopt the standard, run it on your corpus, and never touch anything else on this site.
The attestation layer is one thing built on top of the standard: it records what a governed community has decided — after its governance has decided it. It consumes PX3; it does not define it. The direction never reverses.
An attestation act is already public: the proof — the standard’s own existence, anchored before any of it opened. That is the shape this layer generalizes: decide first, inscribe after, verify forever.
One more layer stands beside all this: the memory layer. Attestation records what was decided; memory records what happened — and the discipline of what an agent may do with each. Decide, inscribe, remember.
The governance framework is yours; the universe is ours.
What ships at this layer will be documented here when it ships, and not before.