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How do I get hash to verify transaction?

Started by Bitcoin, May 13, 2022, 08:12 pm

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Bitcoin

May 13, 2022, 08:12 pm
How do I get hash to verify transaction?

If I have the public key and signature for a transaction how do I get the hash value that is used in verify(hash, sig, pubkey). I want to know how to work backwards from a raw transaction to get it,  not how to build it.



My question is basically this one



How to verify the signature of a raw transaction



But the answer given I think is for getting the Transaction ID hash which I have tried and it doesn't work.


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