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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.
That is the extraordinary evidence being referenced.
Ordinary claims require ordinary evidence, then?
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.