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Title: How does HASHSIG work? Post by: fabbit on January 19, 2020, 04:10:41 PM Hi everyone,
I am reading an article about how HASHSIG works, but i don't understand this: Before the signature is computed, several temporary changes are made to the transaction: The signature script of the currently signed input is replaced with the public key script, excluding all occurences of OP CODESEPARATOR in it, of the referenced transaction output. I mean why the scriptSig is replaced with the scriptPubKey? Title: Re: How does HASHSIG work? Post by: DaCryptoRaccoon on January 19, 2020, 09:25:33 PM OP_CODESEPARATOR is not used any more from what I can tell this was actually a security risk for bitcoin as per the post below.
The official info behind this would be as follows : OP_CODESEPARATOR OPCode = 171 Hex = 0xab Input = Nothing Output = Nothing Description = All of the signature checking words will only match signatures to the data after the most recently-executed OP_CODESEPARATOR. The post below will give some more info related to this OP code though it is no longer used as far as I can tell. https://bitcointalk.org/index.php?topic=255145.msg2760786#msg2760786 ** Edit ** You can also read here some more info about it. https://github.com/bitcoin/bips/blob/master/bip-0017.mediawiki Title: Re: How does HASHSIG work? Post by: fabbit on January 19, 2020, 09:38:46 PM Thanks, but why the scriptSig is replaced with scriptPubKey?
Title: Re: How does HASHSIG work? Post by: BrewMaster on January 20, 2020, 10:24:35 AM Thanks, but why the scriptSig is replaced with scriptPubKey? did you read the replies in your other topic? the answer to this question is already explained there in 2 posts particularly in this one: https://bitcointalk.org/index.php?topic=5216988.msg53606106#msg53606106 |