...there are numerous sources listed...here's an excerpt from FactCheck.org...(attached)
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The nuclear agreement included China, France, Germany, Russia, the United Kingdom, the United States and the European Union, so Obama didn't carry out any part of it on his own. The deal did lift some sanctions, which lifted a freeze on Irans's assets that were held largely in foreign, not U.S., banks. And, to be clear, the money that was unfrozen belonged to Iran. It had only been made inaccessible by sanctions aimed at crippling the country's nuclear program.
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Got it?
Link: https://www.factcheck.org/2019/03/obama-didnt-give-iran-150-billion-in-cash/