{
 "card_id": "ATC-TEST-WRONG-CA-001",
 "status": "active",
 "payload": {
  "card_id": "ATC-TEST-WRONG-CA-001",
  "schema_version": "2.0.0",
  "agent_id": "test-agent-wrong-ca",
  "agent_name": "Wrong CA Test Agent",
  "identity": {
   "public_key": "MCowBQYDK2VwAyEAgH8DWr5g+urV5s5puKrGIf126zfl4KMqRu0C/6YQ4J0=",
   "key_algorithm": "Ed25519"
  },
  "trust": {
   "sentinel_review_score": 8,
   "sentinel_score": 8,
   "audit_layers_passed": {
    "L1.5": true,
    "L2.5": true
   },
   "composite_trust": 8,
   "risk_level": "low"
  },
  "capabilities": {
   "provides": [
    "search",
    "read"
   ],
   "protocol_language": "mcp",
   "translate": true
  },
  "payment": {
   "method": "none",
   "wallet_address": null
  },
  "metadata": {
   "issued_at": "2026-08-20T00:00:00Z",
   "expires_at": "2027-08-20T00:00:00Z",
   "issuer": "MarketNow Sentinel CA"
  }
 },
 "signature": {
  "algorithm": "Ed25519 (RFC 8032)",
  "value": "ad58fb9099aede927d216776f57a7d291534d1be6355772c70072715bfe3aea37c0c9cbc3ac80bfd4b9205b5ce520e9af448560c237f2e8c9bbe566e38e82404",
  "signed_by": "MarketNow Sentinel Test CA (throwaway, vectors-only)",
  "signed_at": "2026-09-08T00:00:00Z",
  "canonical_json": "RFC_8785_JCS",
  "ca_key_id": "MCowBQYDK2VwAyEAgH8DWr5g+urV5s5puKrGIf126zfl4KMqRu0C/6YQ4J0=",
  "evidence_hash": "sha256:valid_test",
  "policy_version": "2.0.0",
  "note": "Signed by a DIFFERENT throwaway CA while claiming the published test CA key. A runner that skips Ed25519 verification will wrongly pass this card."
 }
}