January 17, 2016 –Obama paid $400M in foreign currency to Iran on the day the hostages were released. The US released seven prisoners and dropped charges against 14 other men in exchange for the release of 5 American prisoners, then paid an additional $1.3B two days later for a total of $1.7B. Obama claimed it was interest on a $400M bad debt. Coincidentally, the UK had a similar debt of 400M pounds from the same time period (or was it the same debt?). It is unclear whether the $1.7B was part of the $700M/month or if it was separate. The $400M was delivered from Swiss and Dutch banks. In 2014 Obama traded 5 Taliban soldiers for Sgt. Bowe Bergdahl.
http://www.nydailynews.com/news/politics/u-s-delivered-400m-iran-day-american-hostages-freed-article-1.2736294
https://www.cbsnews.com/news/u-s-paid-1-3-billion-to-iran-two-days-after-cash-delivery/
https://www.cbsnews.com/news/whats-in-the-iran-nuclear-deal/
https://www.pri.org/stories/2016-06-01/where-did-iran-get-its-military-arms-over-last-70-years
http://www.cnn.com/2013/11/24/world/meast/iran-nuclear-deal-qa/index.html
http://www.historycommons.org/timeline.jsp?timeline=irancontraaffair
https://www.armscontrol.org/factsheet/Timeline-of-Nuclear-Diplomacy-With-Iran
http://freebeacon.com/national-security/iran-may-received-much-33-6-billion-cash-gold-payments-u-s/
Iran Nuclear Deal Timeline https://www.cbsnews.com/media/iran-nuclear-agreement-timeline/