{
    "aiep_version": "2.0.0",
    "type": "schema_reference",
    "title": "AIEP Evidence Artefact Schema",
    "description": "Schema definition for an AIEP evidence artefact. Artefacts are the atomic unit of the AIEP evidence rail — each binds a source URL to a content hash.",
    "fields": {
        "artefact_id": "Unique identifier for this artefact within the rail (e.g. ev_001)",
        "source_url": "URL of the retrieved source document",
        "confidence_tier": "One of: verified | high | medium | low | unverified",
        "content_hash": "SHA-256 hex digest of the retrieved source content",
        "hash_algorithm": "Hash algorithm used — currently always sha256",
        "retrieved_at": "ISO 8601 timestamp of source retrieval",
        "validation_status": "One of: passed | failed | pending"
    },
    "example_url": "https://aiep.dev/examples/evidence.json",
    "generated_at": "2026-04-25T00:00:00Z",
    "protocol_url": "https://aiep.dev",
    "github": "https://github.com/phatfella/AIEP-VALIDATOR"
}