Somehow, rather than being held in escrow, I believe the money is more likly a retainer/down-payment on terrorist operations in one way or another, with the catalyst to be named at future time.
This is a simple contract deal...money covers options A, B, C, etc. Menu plan. If Iran asks for various actions...the contractor will deliver. There is no doubt that the number of suicide bombers going into Isreal within the first week will over 100. Although you will start to run out at some point of Jihad Johnny's who desire the 72 virgins. The trick here is to stick it out for a month...and Iran's steam will be finished off. The sad thing for Palestinians will be that Isreal will blunty aim at them...and you will see entire villages blown up overnight. The entire leadership of new Palestinian government will likely meet an untimely end at some meeting.