{
  "v": 1,
  "requestId": "2ee7e9e2-a023-450d-bcc7-cf33856d8ad2",
  "chainId": 1,
  "window": {
    "toBlock": 26049165,
    "fromBlock": 26048866,
    "toBlockHash": "0x20426a3e4b845b87cd43d6683e11e5637765c8319cd7126a02222ae16a8c65cd"
  },
  "answerType": "uint256",
  "answer": "12244000",
  "definitions": {
    "activation": "The first Ethereum mainnet block at which the Berlin protocol upgrade's rules applied.",
    "answer": "The Ethereum mainnet block number, encoded as a base-10 uint256 string.",
    "source": "Ethereum Foundation, 'Ethereum Berlin Upgrade Announcement' (March 8, 2021), read at the recipe URL; it states that Berlin goes live on mainnet at block 12,244,000.",
    "subject": "This is a historical Ethereum protocol fact; the pinned chain-1 window timestamps the request and is reproduced verbatim, rather than being the range from which the activation height is derived.",
    "missing": "Not applicable: the named primary source establishes the activation height."
  },
  "recipe": {
    "kind": "panel",
    "source": "https://blog.ethereum.org/2021/03/08/ethereum-berlin-upgrade-announcement"
  },
  "notes": "Read the Ethereum Foundation announcement at the recipe URL. Its Berlin Timing section identifies Ethereum mainnet block 12,244,000 as the go-live block. This panel-evidence question concerns that historical protocol fact; the supplied block window is retained exactly as required by the brief."
}