Question about the WSOP winners...

What happens after the winners are presented with all that money after the tournament? They obviously can't walk out of the casino with a chest of 100's, lol. Do they give those giant stacks of money back to the casino in return for a wire transfer to their bank accounts or something?

Was just watching a re-run and never really thought about it until as a joke the winner started stuffing his pockets with the stacks.