Glossary Term:
SighashA flag to Bitcoin signatures that indicates what parts of the transaction the signature signs. (The default is SIGHASH_ALL.) The unsigned parts of the transaction may be modified.
Not to be confused with: Signed hash (a hash of the data to be signed), Transaction malleability / transaction mutability (although non-default sighash flags do allow optional malleability, malleability comprises any way a transaction may be mutated)
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