WritersLogic Namespace v1

1. Overview

This namespace defines the complete vocabulary for the WritersLogic authorship verification system, unifying three concerns under a single context:

• C2PA Custom Assertions C2PA -- Five com.writerslogic.* assertions embedded in C2PA manifests for authorship provenance of text documents.
• Verifiable Credentials VC -- W3C VC 2.0 types for expressing attestation results as portable, independently verifiable credentials.
• Forensic Report Ontology FORENSIC -- Structured data for authorship examination reports, extending W3C PROV-O.

2. C2PA Custom Assertions C2PA

Five custom assertions under the com.writerslogic.* namespace (per C2PA §12.5 reverse-domain naming). Each is independently verifiable via the C2PA claim signature. Third-party C2PA verifiers validate the manifest signature and hash binding; our verifier interprets the custom assertion payloads.

Tier Mapping

Standard C2PA Assertions (also present)

2.1 com.writerslogic.process-proof v2

Top-level verdict and trust assessment. This is what a verifier reads first to determine authorship confidence.

signalScores sub-fields

2.2 com.writerslogic.keystroke-cadence v1

Typing timing fingerprint enabling independent cadence verification.

timing sub-fields

dwell sub-fields

corrections sub-fields

2.3 com.writerslogic.cognitive-markers v1

Deep behavioral analysis dimensions. The evidence that typing was cognitive, not mechanical.

cognitiveLoad sub-fields (required: ikiSurprisalRho, sentenceArcRSquared, structuralPauseConcentration, compositeScore)

revisionTopology sub-fields (required: detourRatio, leadingEdgeDivergence, insertionPointEntropy, compositeScore)

errorEcology sub-fields (required: jsdFromCognitive, jsdFromTranscriptive, compositeScore)

likelihoodModel sub-fields (required: sessionPCognitive, windowCount, compositeScore)

focus sub-fields

editMetrics sub-fields

2.4 com.writerslogic.evidence-chain v1

Temporal proof chain with per-checkpoint cryptographic seals.

seals[] item fields

sessionStats sub-fields

2.5 com.writerslogic.verifiable-credential VC

Embeds a complete W3C Verifiable Credential 2.0 document with a Data Integrity proof (cryptosuite: eddsa-jcs-2022). This is the only assertion encoded as JSON rather than CBOR, because the Data Integrity proof requires JCS canonicalization.

The VC envelope follows the standard W3C VC 2.0 structure. The schema below defines the credentialSubject containing the WritersProof-specific ProcessAttestation.

processAttestation sub-fields (required: status)

3. CBOR Encoding Notes

All C2PA assertions except verifiable-credential are encoded as CBOR (per C2PA 2.4 §8.4.2).

• Map keys: Text strings (CBOR major type 3) in camelCase. The JSON Schemas define the logical structure; the wire encoding uses the same key names as CBOR text string keys.
• Numeric values: Integers use CBOR major types 0/1. Floating-point values use CBOR major type 7 (IEEE 754 float64).
• Null values: CBOR simple value 22 (0xf6). Fields typed as ["object", "null"] or ["number", "null"] may be null when the analysis module did not produce results.
• Byte strings: Hex-encoded strings in JSON schemas correspond to CBOR byte strings (major type 2) in the wire format.
• Exception: verifiable-credential uses JSON encoding (CBOR major type 3 text string containing the serialized JSON document) because Data Integrity proofs require JCS canonicalization over the JSON representation.

4. Interpretation Guidelines

Score Ranges

All composite scores use the range [0.0, 1.0] where higher values indicate stronger cognitive (human-authored) signals.

Reference Values for Key Discriminators

Attestation Tiers

Risk Levels

5. Verifiable Credential Types VC

VC Usage Example

{
  "@context": [
    "https://www.w3.org/ns/credentials/v2",
    "https://writerslogic.com/ns/v1/context.jsonld"
  ],
  "type": ["VerifiableCredential", "ProcessAttestationCredential"],
  "issuer": "did:web:api.writersproof.com",
  "validFrom": "2026-05-27T00:00:00Z",
  "credentialSubject": {
    "id": "did:key:z6Mk...",
    "type": "ProcessAttestation",
    "processAttestation": {
      "status": "human-authored",
      "attestationTier": 2,
      "documentRef": "a3f8d2e1...",
      "chainDuration": 9000,
      "writingMode": "cognitive",
      "compositionMode": "direct-composition",
      "forensicSignals": {
        "cognitiveLoadScore": 0.74,
        "revisionTopologyScore": 0.81,
        "errorEcologyScore": 0.69,
        "likelihoodPCognitive": 0.77,
        "compositionModeScore": 0.85,
        "detourRatio": 0.42,
        "leadingEdgeDivergence": 0.28,
        "insertionPointEntropy": 3.1
      }
    }
  },
  "evidence": [{
    "type": "PopAttestationResult",
    "verifier": "did:web:api.writersproof.com",
    "attestationResult": "urn:cpop:war:abc123",
    "digestSRI": "sha256-base64encodedhash...",
    "mediaType": "application/cwar+cbor"
  }],
  "proof": {
    "type": "DataIntegrityProof",
    "cryptosuite": "eddsa-jcs-2022",
    "verificationMethod": "did:web:api.writersproof.com#key-1",
    "proofPurpose": "assertionMethod",
    "created": "2026-05-27T00:00:00Z",
    "proofValue": "z..."
  }
}

6. Forensic Report Ontology FORENSIC

Structured data vocabulary for forensic authorship examination reports, extending W3C PROV-O.

Core Classes

PROV-O Relations Used

7. Wire Format Schemas WIRE

8. Version History

9. Related Resources

• W3C PROV-O Ontology
• W3C Verifiable Credentials Data Model 2.0
• C2PA Specifications
• IETF draft-condrey-rats-pop-protocol
• IETF draft-condrey-rats-pop-appraisal
• WritersProof Evidence Verifier

URN Scheme