Note that technically, the sanctions do not apply to the Central Bank of Iran, however, they can greatly increase Iran's isolation from global financial system.
The Trump Administration has announced a new round of sanctions against Iran's financial institutions today, and singled out a handful of individuals, including the Iranian Central Bank's governor, as a "terrorist" for his banking activities.
The blacklisting of Seif, which coincided with the start of negotiations among the remaining parties to the Iran deal, reveals Washington's failure to achieve its "pre-planned objectives" against the Islamic Republic.
Treasury Secretary Steven Mnuchin (mih-NOO'-shin) says Seif "covertly funneled" money from the Iran's Revolutionary Guards through al-Bilad Islamic Bank in Iraq to help Hezbollah. But after Trump announced his decision to back out of the nuclear deal, reached under former President Barack Obama, he promised to sanction any companies - including banks - that do business with Iran. That means that anyone in any country who does business with Seif or Tarzali could be punished.
Trump's decision to withdraw from the nuclear deal dealt a major blow to the more moderate Rouhani, who twice won election promising his diplomatic achievement would deliver major economic benefits to Iranians.
In a statement on the website of the US Treasury said that the head of the Central Bank of Iran on behalf of the "revolutionary guards" transferred millions of dollars of terrorist organization "Hezbollah". The exchange system worked with Iran's central bank, and the Treasury Department said Tuesday's actions were a continuation of attempts to disrupt it.
Although it is rare to sanction central bank officials, the US has done it before. Any transactions that involve his signature could potentially run afoul of the sanctions, creating a strong deterrent to foreign governments or businesses considering transactions involving Iran's central bank. Hezbollah fought a battle with Israel in 2006, and Israeli officers have been deeply involved concerning the prospect of one other confrontation. Hezbollah and Iran are helping to prop up the Assad regime in its civil war.
Though it's uncommon to sanction central financial institution officers, the US has carried out it earlier than. And in 2015, the US targeted the governor of Syria's central bank.