If you ever had a Bitcoin address associated with your account you can always sign a message with that key as proof.
He did, it matched. It seems no accounts are being recovered since before the summer even if you follow the procedure. Bummer.
I know Theymos reads this thread once in a while.
I suggest that maybe a larger task force could be appointed for the recovery of stolen accounts.
Otherwise, why staking our btc addresses as a security measure?