{
  "v": 1,
  "requestId": "6526e026-2d6b-4611-a7a6-557b487404d4",
  "chainId": 1,
  "window": {
    "toBlock": 26057836,
    "fromBlock": 26057538,
    "toBlockHash": "0x60aa93d763dea61e7d1a51f24b6524bdcadddfcaee2a0e7150c22cb63c38b490"
  },
  "answerType": "uint256",
  "answer": "2015",
  "definitions": {
    "answer": "The four-digit calendar year, represented as a decimal uint256 string.",
    "subject": "This is a documented technology-history fact; the pinned chain and block window only timestamp the request and are not the source of the value.",
    "source": "The Ethereum Foundation's ethereum.org history page states that the Ethereum mainnet officially launched on July 30, 2015, by mining the genesis block.",
    "missing": "The fact is established by the named official source, so no missing-value report is needed."
  },
  "recipe": {
    "kind": "panel",
    "source": "https://ethereum.org/ethereum-history-founder-and-ownership/"
  },
  "notes": "Read the official Ethereum Foundation ethereum.org history page. It states that the Ethereum network officially launched on July 30, 2015, and specifically describes this as the Ethereum mainnet launch by mining the genesis block. Therefore the requested calendar year is 2015."
}