{
  "v": 1,
  "requestId": "666cbece-e557-4243-a38d-667a7d9a939c",
  "chainId": 1,
  "window": {
    "toBlock": 26049166,
    "fromBlock": 26048867,
    "toBlockHash": "0x2d1a88454168f557726377063956116e98c5d2bfc2e2df1962ce77bbd463b2a4"
  },
  "answerType": "uint256",
  "answer": "11155111",
  "figure": "11155111",
  "definitions": {
    "answer": "the chain ID, as a number",
    "source": "Answer from a reputable public source you actually read (ethereum.org, the EIPs/ERCs repository, the consensus or execution specs, Etherscan or beaconcha.in, or a major news archive) and name it.",
    "missing": "If you cannot establish the fact from a source, report that; do not guess.",
    "subject": "The question is about Ethereum's protocol and history. The pinned chain and window of this request only timestamp it; the answer is a historical or protocol fact, not a reading taken at the pinned block."
  },
  "recipe": {
    "kind": "panel",
    "source": "https://ethereum.org/developers/docs/apis/json-rpc/"
  },
  "notes": "Read the official ethereum.org JSON-RPC API documentation: its network ID list identifies 11155111 as the Sepolia testnet. The panel recipe uses that source because the request defines this as a protocol fact and the pinned blocks as timestamp context. For RPC cross-checks, eth_chainId at https://ethereum-sepolia.gateway.tatum.io returned 0xaa36a7 (11155111). eth_chainId at https://rpc.flashbots.net/fast and https://rpc.mevblocker.io/fast returned 0x1; both returned the pinned closing block hash at block 26049166, and Flashbots returned block 26048867 as the opening block."
}