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This tag should be used for questions regarding digital signatures. A digital signature proves that the owner of a private key produced or endorsed a given message. These are used in transactions to prove that an output can be spent in a transaction.

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I'm trying to identify what it is that the bad act provides to the victim, the "signature as a private key" seemed like a possibility. … Even if the "signature as a private key" idea isn't used in LN, it seems like a useful concept, but I couldn't find anything on the internet discussing it. …
asked Jul 31 '16 by Dave Scotese
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On the other hand, regarding the question I actually posed, I think the answer is NO, there is currently no tech that uses a signature as a private key. …
answered Aug 1 '16 by Dave Scotese
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1answer
It also requires a signature which can be verified only if the public key is known. When tagged field n is not included, something called "signature recovery" is required. How does that work? … If signature recovery is built in, I guess that means I can get the public key even if tagged field 'n' is missing. But how would I do that? …
asked May 28 '20 by Dave Scotese