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I've been learning about mining as part of a pool and using the Stratum protocol to submit completed work back to a pool -- https://en.bitcoin.it/wiki/Stratum_mining_protocol . There is this parameter, "ExtraNonce2," a value that the miner keeps changing. Could someone tell me a scenario where a pool worker submits a nonce that correctly hashes the data it was given according to the difficulty, but it submits an "ExtraNonce2" value that causes the mining pool to reject the submission?

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    Do you have any reason to think that would ever happen? – David Schwartz Mar 18 '18 at 1:33
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There is no such a scenario. The ExtraNonce2 is part of the data that is hashed. So if a miner finds a valid nonce, he must also have the corresponding ExtraNonce2 that is part of the data that is hashed in order to produce a valid block hash.

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