There are at least 2 ways to prove that he is Satoshi:
Satoshi Nakamoto <satoshin@gmx.com>
He should have access to email Satoshi.
Satoshi Nakamoto in bitcointalk.org
Log in to your bitcointalk.org account
And leave a message: "Hello, this is Craig Wright and I am Satoshi Nakamoto!"
If this is done, there will be, almost, no doubt that Satoshi is him!
Let the judge accept this information!
Get with the times, youngling.
The gmx email address was compromised years ago and put up for sale.
The bitcointalk database has been compromised multiple times and satoshi's account has been long shut down.
Even if he signed from one of the known blocks all it would prove is that he controlled those private keys at that moment of signing, though of course it would be much more compelling than anything else.
No one can prove they're Satoshi without a shred of doubt. It's too late now.
Did anyone ever try and figure out from the logs what IP address he was connecting from?
Don't tell anyone
Weeeeeeee