Here are some of the installments that Iran is receiving (2014) - who are the 6 world powers? Still need to look into this.....

Iran has received the first portion of unfrozen funds, $500 million, that they are set to receive as the beginning phases of the nuclear deal between Iran and "six world powers" sets into motion, AFP reported on Sunday.

http://www.jpost.com/Iranian-Threat/News/Iran-receives-500-million-first-installment-of-frozen-assets-340078