| Internet-Draft | PSI-04 | October 2026 |
| Singh | Expires 16 April 2027 | [Page] |
This document defines PSI-04, a domain profile of Proof of Stateful Integrity (PSI) for records about vulnerable persons, such as clinical-trial participants and recipients of disability or aged care services. PSI-04 seals each state transition of a record as a PSI receipt chained to the previous one, so that later alteration or omission of a transition is detectable. Only digests are sealed; no personal data leaves the record holder. PSI-04 shows integrity and ordering only and does not show that care was adequate or that any regulation was met.¶
This revision withdraws the multi-party computation and zero-knowledge claims of revision 00 and the request for a URI scheme.¶
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This Internet-Draft will expire on 16 April 2027.¶
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Records about vulnerable persons are often reviewed long after they are written, and disputes turn on whether entries were changed after the fact. PSI-04 applies the receipt format of [PSI] to each transition so a reviewer can check that the chain they see is the chain that was sealed.¶
The key words "MUST", "MUST NOT", "SHOULD", "SHOULD NOT", and "MAY" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.¶
Each transition is a JSON object with members subject_ref, state, actor_ref, prev_transition_hash, and salt.¶
The record holder computes the record digest per [PSI] and submits only the digest for sealing.¶
A reviewer given the transitions and receipts verifies each receipt per [PSI] and checks that every prev_transition_hash equals the digest of its predecessor. A missing, reordered, or altered transition causes a mismatch.¶
The considerations of [PSI] apply. In addition, PSI-04 cannot detect a false entry sealed at the time it was made, nor transitions that were never sealed. Linking a pseudonymous reference to a person relies entirely on the record holder's own controls.¶
This document has no IANA actions.¶