Someone I'm in contact with sent me a transaction from his Mt.Gox account to a missing instawallet of mine.
He has access to it actually and we are in contact (finally!).

How can he send me a proof that the transaction come indeed from him?
I'm not a user of Mt.Gox and according to him there is no way for him to provide a cryptographic evidence from a gox account.

edit : can I ask him to send to someone from Bitcoin Central staff a satoshi to prove he own that said address ?

Thanks for your input and response.


wordofmouth