Mystery creator of Bitcoin identified, new HBO documentary claims
politico.eu
Intriguingly, as the date for the airing of the documentary has drawn near, a number of high-value wallets from the "Satoshi era" have become active for the first time since 2009.
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No, because it's an extraordinary claim.
"Extraordinary" means outside the realm of ordinary. Signing a message is very ordinary
EDIT: Sorry I ment to say: saying "I own a key" is ordinary, and signing a message is the ordinary way to prove you own the key
Sure, anyone can sign with a key. Having THE key is the extraordinary part.
Saying you know who Satoshi is, that's the claim, and that's an extraordinary claim.