{
  "schema": "csoai.wrapper-parity/0.1",
  "kind": "preview",
  "card": {
    "schema": "https://councilof.ai/schema/card-v0.json",
    "surface": "public.notice",
    "subject": "wrapped cbBTC on base vs native issuance — UNMEASURED",
    "as_of": "2026-09-14T03:42:23Z",
    "source_urls": [
      "https://mainnet.base.org"
    ],
    "payload": {
      "kind": "csoai.wrapper.parity/0.1",
      "attests": "point-in-time reads at the pinned blocks named below — a ratio, not a rate, not a grade, not a reserve attestation, not a certificate",
      "id": "cbbtc:base",
      "backing_model": "custodial",
      "wrapped": {
        "chain": "base",
        "symbol": "cbBTC",
        "address": "0xcbB7C0000aB88B473b1f5aFd9ef808440eed33Bf",
        "chainId": 8453,
        "rpc": "https://mainnet.base.org"
      },
      "canonical": {
        "chain": "bitcoin",
        "symbol": "BTC",
        "address": "Coinbase custody; not an EVM contract",
        "chainId": null,
        "rpc": null
      },
      "escrow": null,
      "escrow_name": null,
      "note": "BTC reserve in Coinbase custody, self-published. INDEXED, no parity claimed.",
      "fetched_at": "2026-09-14T03:42:23Z",
      "reads": {},
      "state": "UNMEASURED",
      "error": "RPC error: over rate limit",
      "unmeasured": [
        "chain reads (rpc failed; nothing inferred)"
      ]
    },
    "tags": [
      "eater:wrapper-parity",
      "axis:distribution-integrity",
      "backing:custodial",
      "state:UNMEASURED"
    ],
    "unmeasured": [
      "chain reads (rpc failed; nothing inferred)"
    ],
    "did_intended": "did:web:csoai.org#board-attestation-1",
    "preview": true,
    "preview_note": "unsigned preview — no signature, no raw-read hashes. The signed pack (same schema, sig_ed25519 + inputs_sha256 + per-read sha256) is the metered artefact."
  },
  "buy": {
    "resource": "https://councilof.ai/api/wrapper?id=cbbtc%3Abase",
    "how": "GET the resource → 402 → pay accepts[] (x402) → retry with X-PAYMENT",
    "catalog": "https://councilof.ai/api/x402"
  },
  "rail": {
    "mode": "live",
    "pay_to_configured": true,
    "facilitator_configured": true,
    "note": "A settled receipt (facilitator /verify then /settle) unlocks the paid artefact. Verification of every artefact stays free."
  }
}