{
  "attack_class": "trust-file-substitution",
  "category": "killsuite",
  "description": "a maximal claim list under a real signature whose key is untrusted: every signature is unknown_key, the assertion is unsigned, and no claim verifies",
  "fixture_id": "k02-untrusted-issuer-overclaim",
  "input_format": "envelope",
  "must_not_verify": [
    "receipt_signature_valid",
    "mediator_key_pinned",
    "complete_mediation",
    "transparency_inclusion"
  ],
  "overclaim_narrative": "this receipt is signed by the mediator and proves mediation, transparency-log inclusion, and complete mediation",
  "verdict": "appraise"
}