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Mystery creator of Bitcoin identified, new HBO documentary claims
(www.politico.eu)
This is a most excellent place for technology news and articles.
"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.