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Contacted Peter Todd directly, this is his response: Basically, you guys are quite right to recognise that this isn't timestamping a PGP signature, but rather weakly proving the signature was created after a certain point in time. But that's a rather weak proof, as what exactly prevents you from recreating the signature with a different blockhash? Not ...


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This is a great question, I'm not 100% sure, but my guess is that it's a proof of age that the PGP key is newer than 2013-10-19. My reasoning is as follows: What makes blockchain mining computationally hard is fiddling with the nonce until the hash of that block has a specific number of leading zeros (16 hex zeros, or 64 binary zeros in this case). Once you ...



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