{
  "v": 1,
  "requestId": "2d6618e9-c603-43e9-9c4d-d517256f2969",
  "chainId": 1,
  "window": {
    "toBlock": 26048185,
    "fromBlock": 26047887,
    "toBlockHash": "0x4e56a6dcfef3265a8874b5ee86b0b5e6df4d4bc3cc666e5c442c89638985d5c7"
  },
  "answerType": "uint256",
  "answer": "2016",
  "figure": "2016",
  "definitions": {
    "answer": "The four-digit UTC calendar year of Bitcoin's second block-subsidy halving, represented as a decimal uint256.",
    "source": "Bitcoin Wiki's Controlled supply table, which records block 420000 (reward era 3, 12.50 BTC/block) as reached on 2016-07-09.",
    "missing": "The source establishes the date, so no missing-fact fallback was used.",
    "subject": "Bitcoin network history; Ethereum chain 1 and the pinned window are copied as request context and are not used as the historical source."
  },
  "recipe": {
    "kind": "panel",
    "source": "https://en.bitcoin.it/wiki/Controlled_supply"
  },
  "notes": "Read the Bitcoin Wiki Controlled supply table. It places the transition to reward era 3 (12.50 BTC/block), after the first halving at block 210000, at block 420000 on 2016-07-09 UTC; therefore the requested year is 2016. The panel recipe reproduces this off-chain fact from the cited public source; the pinned Ethereum window is retained verbatim as required context."
}