Can the moderators do something? Look at an IP log, confirm if he really sold the account. Did the account password recovery email changed lately? It would be so much easier if account trades are banned, to prevent such discussions.
I hope that he will return the funds to all people that have an unfinished deal with him. If he always could sign a message the good way, and now they are bad, then it is possible his account has been sold. But he also could have faked it, we only can know this if the MODS/ADMIN can help us to solve this.
Or ask some very good detective(QuickSeller???)
QuickSeller is already into this.. Mods for now are behind the scenes.. I suppose they do their work in silence..
I am getting a little bit out of topic here, but i just wonder because i have seen it in 3 posts till now..
What can Gleb do?? Is he a hacker or something?
Well, if you are asking this, then you actually don't know him newbie.

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I have signed up 2 weeks ago and i have read a loooot of stuff.. Yes newbie but not ignorrant

Also imagine how this looks to all of us (newbies)..
The only way for us to buy some stuff is through escrow (Thats normal of course).. I made today my first buy through escrow and i feel very insecure.. 3 days ago i would be very cool about escrow..