https://www.politifact.com/georgia/statements/2017/jun/06/karen-handel/Handel-pushes-details-Iran-deal-terror-support/
“The Iran deal focused on reducing Iran’s stockpiles of nuclear-grade material, but a key provision unlocked Iranian assets that had been frozen for decades. How much money was there is a matter of debate.
The U.S. Treasury Department estimated the value of Iran’s foreign currency reserves at $100 billion. An article in Foreign Policy magazine cited $120 billion.
The Institute of International Finance, a trade association representing banks, insurance companies and other financial entities worldwide, ran its own numbers and settled on $100 billion.”
“a March 17, 2016, letter from the U.S. State Department saying Iran had received about $1.7 billion as part of the nuclear agreement. The money was legally due to Iran. The country had paid America for military equipment in 1979, but then the Iranian revolution came and the hardware was never delivered.
In August 2016, many news organizations reported the delivery of $400 million of that $1.7 billion in cash. As part of that exchange, an unmarked cargo plane delivered the money after American officials were certain that three Americans held in Iran were on their way home.
It is not known how the remaining $1.3 billion made its way to Iran. Given the isolation of Iran’s banking system, it is possible that the payment was made in cash and flown to Iran, but neither we nor Handel’s staff could point to any report that said that definitely took place.