Does your account have old BTC addresses posted? If yes, then you could create a signed message from those addresses and PM a moderator of this forum. If they see substantial evidence to support that you have owned the account, I am sure that they will give it back to you.
Funny thing is that the account hasn't been logged into for almost 2 weeks now.
Thanks for the tip and the answer!
As for proof of real user, just the language and the topics discussed by this guy are more than enough to prove that it wasn't me haha...
Gonna give a try now!
Still, it can't really prove that that was your account. Anyone could create another account and claim that it was theirs. Signed messages are the minimum you can do, maybe emails from bitcointalk to your email address can be another form, but don't count on it.
Yeah, it's what I did, I contacted an admin giving him informations that only I have access to (and hopefully the archives of the forum). Well, in my case it's pretty obvious that my account was stolen, change of email address (after 4 years...), the guy commented on some altcoin topic that has nothing to do with my previous activities (ICOs). He changed everything, deleted signature etc etc.... And if that's not enough the change of language, pretty obvious when you read my 240 posts and his 2 posts.
Hopefully an admin or someone in charge will help out.
Thanks for your answer though!