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Title: Calculate Z value from r and s Post by: elpanxaaa on May 05, 2020, 09:07:08 PM Can anyone explain me any clearly answer or code in python with examples how we can calculate Z value from r and s ?? I search in google and youtube and i not saw any correctly answer i just see scam posts or video in youtube.
thank you in advance Title: Re: Calculate Z value from r and s Post by: pooya87 on May 06, 2020, 04:31:54 AM you should first explain what it is you are trying to do and what you have in mind when you say "Z".
if Z is the 256-bit value used in creation of the signature then you can't compute it from r and s, it is computed from the data that was signed. in which case it depends on what was signed, for example in message signing the normalized UTF-8 decode of the message string + a fixed string added to the start of it then hashed twice with SHA256. for a transaction this is a lot more complicated and is not something i can cover in one comment because it includes transaction serialization and working with scripts and changes based on the script type being spent. |