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Is it possible to calculate a public key from the message hash and signature?

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It is possible to create a public key from the signature. It will be equivalent to the key used to generate the signature but not necessarily identical.

You can find an example implementation here.

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  • I think you not right – Denis Leonov Sep 21 '17 at 22:59
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    I guess that's possible. Do you have some reason to think that I'm not right? Or maybe this link will convince you. Or perhaps section 4.1.6 of this link. – David Schwartz Sep 21 '17 at 23:14
  • proove it please – Denis Leonov Sep 22 '17 at 0:32
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    Read David's links. – Pieter Wuille Sep 22 '17 at 0:36
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    Read David's answer. – Pieter Wuille Sep 22 '17 at 1:37

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