Axiom VI: The Right to Opacity
No Chapter may compel disclosure of identity, belief, association, transaction history, or personal data beyond what the Sovereign explicitly consented to at the point of entry.
Privacy is not a feature. It is an Axiom.
If a Chapter changes consent conditions after joining and demands more data, the Sovereign has the right to refuse without consequences (because exit is already guaranteed by Axiom 0).
Mechanism
JanusIdentity with ZK-Proofs for selective disclosure. Consent conditions are part of the ChapterGenesis and thus Bitcoin-anchored; subsequent changes are visible.