it is not possible to be reversible, please : Q.I transferred funds to the wrong player, can you help reverse the transaction?
A.
We will attempt to reverse the transaction but we cannot guarantee that this will indeed be possible. Players are ultimately responsible for ensuring that they entered the correct details of the intended recipient. Please email
security@pokerstars.com as soon as possible with details of the transaction (date, time, amount and the User ID of the recipient).
http://www.pokerstars.com/poker/room/support/security-faq/#Itransferredfundstothewrongplayercanyouhelpreversethetransaction( You can always ask them if everything is alright with one account before send funds or receive them, for security purpuses, they will check IP address , if u got proof like bit coin talk forum screenshots of an smooth trade or things like that it wont be a problem to keep ur money safe.
( Anyway, i dont think this guy has those 30k =P)
Greetings.