{
  "cvin": "cvin:nv.h100.sxm.80g:6a1kfvdo43buqm34",
  "exists": true,
  "observation_count": 11,
  "valid": true,
  "asset_chain": {
    "valid": true,
    "breaks": []
  },
  "global_chain": {
    "valid": true,
    "mismatches": 0
  },
  "head_hash": "397d4e1d50b7e792bf912581afb29fea59994ce6ccc938e8b49a97e63cd982b1",
  "first_observed_at": "2026-04-25T09:43:39.122Z",
  "last_observed_at": "2026-11-03T19:28:39.481Z",
  "replay_note": "任何第三方可用规范 v0.1 独立重放：hash = sha256(canon({cvin,obs_type,source_url,observed_at,attrs,prev_hash}))",
  "signature": {
    "algorithm": "ed25519",
    "public_key_pem": "-----BEGIN PUBLIC KEY-----\nMCowBQYDK2VwAyEAL+4PzB/ZhASccD4lQGTUJ+rd71feE5kODHrtjJ/tx+M=\n-----END PUBLIC KEY-----\n",
    "payload_sha256": "73b5c3624d695c683b26af1ad4403d8cd7b7f2b658b7566d4a112eb0cb5f0dca",
    "value": "dp+kXO66XGhybFvxbEP1zn/wFdxvhTKg5l0g9ePnTbPBnRJ6lJFWMomcH/vrARGJAJqUmNCXcfgNyqBkHueHBg=="
  },
  "verified_at": "2026-11-04T08:39:13.321Z",
  "billing": {
    "ok": true,
    "via": "free-quota",
    "amount_usd": 0,
    "note": "每日首次免费额度已使用；后续调用 $0.05/次（x402），或购买正式报告"
  }
}