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When a transaction is pushed directly to a miner does it check whether the transaction is segwit or not or only if it is valid?

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The miner only determines if it is valid. Miners do not, in a sense, "discriminate" between Segwit or Legacy.

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  • I think legacy miner(pre-segwit) needs to distinguish between anyone-can-spend transactions and legacy transactions for the simple reason that they can't validate segwit transactions.
    – sanket1729
    Mar 28 '18 at 8:36
  • @sanket1729 No, by definition they can't, as they don't even know about the existance of segwit. All they see is a weird but valid output that anyone can spend. They're not aware of the new rules that do not make them so trivial. Mar 31 '18 at 4:55
  • @PieterWuille, should there not be any policy in the legacy miners to not include transactions which contain anyone can spend outputs since they cannot risk creating an invalid block?
    – sanket1729
    Apr 1 '18 at 11:41

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