APEX Infrastructure

MelbourneVictoriaAustralia kawaljeet.singh3008@gmail.comhttps://ai-governance-standard.com

This document defines PSI-Age, a domain profile of Proof of Stateful Integrity (PSI) for age assurance decisions, so that a relying party can later show which provider decision it relied on. This document is superseded in substance by draft-singh-apex-psi-09 and is retained only for continuity. Each record is sealed as a PSI receipt so that later alteration, reordering, or removal is detectable. Only digests are sealed. PSI-Age shows integrity and ordering only; it does not show the age of any person, the accuracy of the method, or compliance with any age assurance law. The title of revision 00 claimed a zero-knowledge construction. No zero-knowledge proof system is specified; the claim is withdrawn.

IntroductionThis profile applies the receipt format of to one record type. The key words "MUST", "MUST NOT", "SHOULD", and "MAY" in this document are to be interpreted as described in BCP 14 when, and only when, they appear in all capitals, as shown here.

Record ProfileA record is a JSON object that MUST contain the following members and MAY contain others:

• subject_ref, an opaque one-time identifier
• method_ref
• outcome
• salt, at least 128 bits of randomness

The record holder computes the record digest per and submits only the digest for sealing. Records SHOULD NOT contain personal data.

VerificationA verifier given a record and its receipt verifies the receipt per . Verification reports digest match and signature validity only.

Security ConsiderationsThe considerations of apply. A record that was false when sealed remains false; a record that was never sealed is not detected as missing unless records are chained.

IANA ConsiderationsThis document has no IANA actions.

Normative References