according to Reuters who now received the Framework agreement and papers of the Iran-US deal and confirmed then again with US officials.
the 300 billion is indeed written in there and its "Privately funded",
and half of it is already collected.
Most of the money will come from private US billionaires and some Gulf Arab´s related to their ruling families.
DUBAI, June 16 (Reuters) - A $300 billion private fund designed to trigger investment into Iran is outlined in the U.S.-Iran
framework agreement and more than half that sum has already been committed, a source with direct knowledge of the deal told Reuters.
The fund is designed to give both sides an economic incentive to conclude a final deal, said the source, who spoke on condition of anonymity because the plan has not yet been announced as Washington and Tehran prepare to sign on Friday.