These monies were ordered by The Hage, the world court.

The issues was resolved under Secretary Kerry. It had nothing to do with Americans held by Iran.

August 3, 2016
By Jay Soloman
...The settlement, (click here) which resolved claims before an international tribunal in The Hague, also coincided with the formal implementation that same weekend of the landmark nuclear agreement reached between Tehran, the U.S. and other global powers the summer before.

“With the nuclear deal done, prisoners released, the time was right to resolve this dispute as well,” President Barack Obama said at the White House on Jan. 17—without disclosing the $400 million cash payment.

Senior U.S. officials denied any link between the payment and the prisoner exchange. They say the way the various strands came together simultaneously was coincidental, not the result of any quid pro quo....

There are still innumerable sanctions with Iran and Iran's citizens. Below is only a few. There are far too many for me to count without spending the better part of my day doing it.
'
The sanctions against Iran are still considerable. (click here)

ZOLAL IRAN COMPANY, No. 2 Shariati Avenue, Niyam Street, Tehran, Iran;
Additional Sanctions Information - Subject to Secondary Sanctions [NPWMD]
[IFSR].

"3MG" (a.k.a. MIZAN MACHINE MANUFACTURING GROUP), P.O. Box 16595-365, Tehran,
Iran; Additional Sanctions Information - Subject to Secondary Sanctions [NPWMD]
[IFSR].

"AEIT" (a.k.a. ADVANCE ELECTRICAL AND INDUSTRIAL TECHNOLOGIES SL; a.k.a. CLEAR
TRADE LINK SL), Passeig Verdauguer, 120, Igualada (Barcelona) 08700, Spain;
Additional Sanctions Information - Subject to Secondary Sanctions [NPWMD]
[IFSR].

"AIG - ARMAMENT INDUSTRIES GROUP" (a.k.a. ARMAMENT INDUSTRIES GROUP), Pasdaran
Ave., P.O. Box 19585/777, Tehran, Iran; Sepah Islam Road, Karaj Special Road Km
10, Iran; Additional Sanctions Information - Subject to Secondary Sanctions
[NPWMD] [IFSR].

"AIO" (a.k.a. AEROSPACE INDUSTRIES ORGANIZATION; a.k.a. SAZMANE SANAYE HAVA
FAZA), Langare Street, Nobonyad Square, Tehran, Iran; Additional Sanctions
Information - Subject to Secondary Sanctions [NPWMD] [IFSR].

"ANSAR AL-MOJAHEDIN NO-INTEREST LOAN INSTITUTE" (a.k.a. ANSAR BANK; a.k.a. ANSAR
FINANCE AND CREDIT FUND; a.k.a. ANSAR FINANCIAL AND CREDIT INSTITUTE; a.k.a.
BANK-E ANSAR; f.k.a. "ANSAR INSTITUTE"; f.k.a. "ANSAR SAVING AND INTEREST FREE-
LOANS FUND"), Building No. 539, North Pasdaran Street, Tehran 19575-497, Iran;
North Pasdaran St., No. 539, Before Sahebgharanieh, corner of Narenjestan dahom,
Tehran, Iran; Additional Sanctions Information - Subject to Secondary Sanctions
[IRAN] [NPWMD] [IFSR].

"ANSAR INSTITUTE" (a.k.a. ANSAR BANK; a.k.a. ANSAR FINANCE AND CREDIT FUND;
a.k.a. ANSAR FINANCIAL AND CREDIT INSTITUTE; a.k.a. BANK-E ANSAR; f.k.a. "ANSAR
AL-MOJAHEDIN NO-INTEREST LOAN INSTITUTE"; f.k.a. "ANSAR SAVING AND INTEREST
FREE-LOANS FUND"), Building No. 539, North Pasdaran Street, Tehran 19575-497,
Iran; North Pasdaran St., No. 539, Before Sahebgharanieh, corner of Narenjestan
dahom, Tehran, Iran; Additional Sanctions Information - Subject to Secondary
Sanctions [IRAN] [NPWMD] [IFSR]...