There's no way to prove that you are not the owner of the account. When did it get hacked? Why didn't you assign an email to the account? And if you did, why didn't you lock the account with the new security feature?
Lots of problems with claiming that your account was hacked as it absolves you of responsibility. Thus people who want to scam can simply state that the account was hacked.
I've already provided the evidences. You can try to check that certain account's profile I was done tagging that one and have created a thread also on meta. Most importantly I have already sent theymos and cyrus a message. Why will I'll try to scam my previous account? My point here is that this and that account that i used to have are not connected anymore. Even if I used this thread as an evidence that it was my account. Now is it even possible to remove this as an alternative account of that account?