When miners verifies a transaction, they make some calculations to check its Signature by using some Hash.
What Hash is used for Sig verification in Bitcoin Core?
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@Denis, the same hash that was used by transaction creator when he signed it. – amaclin Oct 31 '17 at 17:35
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@amaclin but block `miner` is not `creator` of transaction – Denis Leonov Oct 31 '17 at 17:43
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@Denis, yes, but the process of calculating the hash is the same – amaclin Oct 31 '17 at 18:43
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I think that the hash function used is sha256d, a non-standard function obtained by hashing with sha256 twice (first hash the data, obtain 256-byte digest, then re-hash the digest).
Charles Bouillaguet
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