{
  "v": 1,
  "requestId": "793ca238-fc30-4bf6-b545-657ab8c6edee",
  "chainId": 1,
  "window": {
    "toBlock": 26049165,
    "fromBlock": 26048866,
    "toBlockHash": "0x20426a3e4b845b87cd43d6683e11e5637765c8319cd7126a02222ae16a8c65cd"
  },
  "answerType": "uint256",
  "answer": "15537394",
  "figure": "15537394",
  "definitions": {
    "answer": "the block number, as a number",
    "terminal_pow_block": "Block 15537393 was the terminal proof-of-work block on Ethereum mainnet; the first proof-of-stake block is the very next block, 15537394, mined at 2022-09-15 06:42:59 UTC.",
    "source": "https://etherscan.io/block/15537394 (Etherscan block explorer, labeled as the first PoS block following The Merge) corroborated by https://ethereum.org/en/roadmap/merge/",
    "subject": "This is a historical/protocol fact about Ethereum's history, not a value read at the pinned window; the pinned window and chain only timestamp this request."
  },
  "recipe": {
    "kind": "panel",
    "source": "https://etherscan.io/block/15537394"
  },
  "notes": "The Merge occurred at Ethereum mainnet block 15537393->15537394 transition on 2022-09-15. Block 15537393 was the terminal proof-of-work block (last block mined via PoW); block 15537394 was the first block validated by proof-of-stake consensus. This is a well-documented historical fact, confirmed via Etherscan's block explorer and Ethereum.org's Merge documentation. No on-chain scan is needed or possible for this off-chain historical fact; the pinned window (26048866-26049165) and chain id merely timestamp the request per the brief's evidence:panel definitions."
}