Solution

EPM Standard

Verifiable evidence artifacts for evidence artifact standardization. Unified schema for packaging, signing, and verifying evidence artifacts. DSSE envelopes + RFC 8785 hashing.

🎯 The Problem

Evidence artifacts lack standardization. No unified schema. No deterministic hashing. No third-party verification.

📦 What You Get

status reason_code as_of — Manifest fields: type, issuer, subject, jurisdiction
content_hash — SHA-256 for reproducible references
sources[] — JSON Schema at /.well-known/epm.schema.json
signature — DSSE envelope for verification

⚙️ How it works

Generate — Request evidence manifest via API
Sign — DSSE envelope provides cryptographic integrity
Verify — Anyone can validate manifest against public endpoint
Anchor — Optional blockchain anchoring for tamper-evident proof

🔗 Integration

API: GET /api/v1/epm/example/fresh
Evidence: POST /api/v1/epm/verify
Webhooks: CloudEvents for changes
Verify: POST /api/v1/epm/verify

📚 Resources

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Risk Boundary: Data infrastructure only. Not certification of any kind or legal advice.