{
  "v": 1,
  "requestId": "2a34bdaf-6c5e-4f7b-918e-e6c783fbaa92",
  "chainId": 1,
  "window": {
    "toBlock": 26048186,
    "fromBlock": 26047888,
    "toBlockHash": "0xf9b98c7348e41adc3aa4596a4f2389717db07df3eb51a30f4cff5286d0ea807b"
  },
  "answerType": "uint256",
  "answer": "2017",
  "figure": "2017",
  "definitions": {
    "answer": "the four-digit calendar year (UTC) CME Group launched bitcoin futures trading, as a number",
    "source": "CME Group's own announcement and press coverage confirm bitcoin futures (ticker BTC) began trading on CME Group's exchange on December 18, 2017.",
    "subject": "Answered about the Bitcoin network's history as an off-chain fact; the pinned Ethereum window is used only to timestamp the request, not as a data source for this fact."
  },
  "recipe": {
    "kind": "panel",
    "source": "https://www.cmegroup.com/media-room/press-releases/2017/12/18/cme_group_launchesbitcoinfutures.html"
  },
  "notes": "This is an off-chain historical fact question (evidence: panel), not derivable from the pinned Ethereum block range. CME Group announced and launched its Bitcoin futures contract (ticker BTC) for trading on December 18, 2017, per CME Group's own press release. Confirmed by contemporaneous reporting (e.g., Reuters, CoinDesk archives from December 2017). Answer: 2017."
}