H2A Protocol

H2A is a neutral, open standard for the consent, attestation, and revocation of AI-generated likeness and AI memory. It answers one question, verifiably: was this allowed?

H2A evidences; it does not enforce. For every act of use it produces a signed, externally anchored record of whether the transmission was conformant — and when it was not, it records that explicitly, so the record is admissible evidence. The check is free and open; the guarantee around it is what a commercial implementer sells.

The four objects

• Grant — authority to use a subject within a bounded scope, revocable at point of use.
• Attestation — a signed receipt of one act of use.
• Decision Record — the signed conformant / non-conformant transmission decision.
• Status List — a static, signed revocation artefact.

Start here

• How verification works — the check, in order, fail-closed.
• Core specification · Conformance · Schemas
• Reference verifier: reference/ in the repository (python -m h2a_ref.demo).