spec.ledgerproofhq.io Open Cryptographic Provenance Protocol for AI System Outputs (OCPP-AI) and companion specifications — maintained by the LedgerProof Foundation (in formation)

This domain hosts the canonical, citable specifications, JSON-LD contexts, conformance materials, and Bitcoin-anchored governance event records published by the LedgerProof Foundation in support of the transparency obligations of Article 50 of Regulation (EU) 2024/1689 (the EU AI Act). All material is published under Creative Commons Attribution 4.0 International (CC BY 4.0). Reference implementations are published under Apache License 2.0.

Specifications

DocumentStatus
OCPP-AI v1.0 Core Specification
EU legislative styling (Recitals + 10 Articles + 3 Annexes). Defines the receipt structure, canonical encoding (CBOR), Ed25519 signatures, SHA-256 Merkle aggregation, and the four Article 50 sub-obligation profiles (ChatbotSession, GeneratedContent, HumanReview, manner-of-disclosure).		 Draft for stakeholder consultation
Anchor Interface Specification v1.0
Substrate-agnostic specification defining eight normative properties (I-1 through I-8) that any conforming cryptographic anchor substrate must satisfy. Bitcoin OP_RETURN as current reference implementation; European Blockchain Services Infrastructure (EBSI) as the primary enterprise-government alternative; dual-anchor deployment recommended for EU-jurisdictional deployers.		 Draft for stakeholder consultation

Machine-readable contexts

ResourceContent-Type
W3C VC 2.0 JSON-LD Context
Maps OCPP-AI receipt content body fields to W3C Verifiable Credentials 2.0 credentialSubject properties. Enables lossless wrapping of OCPP-AI receipts as VC 2.0 credentials and composition with eIDAS 2.0 Qualified Trust Service Providers.		 application/ld+json

Memoranda

DocumentRecipient
DG-CNECT Memorandum (3 June 2026)
Reference Implementation Architecture for AI Act Article 50 Transparency Obligations: Mitigating Systemic Vendor Lock-In and Safeguarding Open Strategic Autonomy.		 European Commission DG-CNECT AI Office

Foundation governance events (Bitcoin-anchored)

Event IDTypeDateStatus
gov-2026-06-03-dgcnect-memo regulatory_submission 3 June 2026 anchor pending block confirmation

Preprint companion (arXiv submission in flight)

OCPP-AI v1 — arXiv preprint LaTeX source · cs.CR primary classification with cs.CY and cs.DC cross-list · single-author preprint companion to the SCITT-WG-track Internet-Draft draft-dawkins-scitt-ai-article50-00. arXiv permanent identifier will be appended to the OCPP-AI v1.0 specification once assigned.

Forthcoming materials

ResourceStatus
Anchor substrate conformance registry Forthcoming — placeholder published; substrate conformance evaluations will populate this URL as additional substrates are evaluated against the Anchor Interface.
OCPP-AI v1.0 conformance test vectors Forthcoming — placeholder published; test vectors covering each Article 50 sub-obligation profile, sample anchor records, sample Merkle proofs, and sample W3C VC 2.0 wrappings will populate this URL.

External references

LedgerProof Foundation is in formation as a Delaware 501(c)(3) public charity under Adler & Colvin counsel, with a Dutch Stichting EU subsidiary under NautaDutilh counsel and EU regulatory engagement scoped with Stibbe Brussels. The specifications hosted at this domain are published for stakeholder consultation at the European Commission AI Office, the European AI Board, CEN-CENELEC Joint Technical Committee 21, the IETF SCITT Working Group, and W3C. The Foundation does not assert patent encumbrance over any specification published here and undertakes that the specifications will not be made subject to commercial licensing. Editorial contact: veronica@ledgerproofhq.io.