The United States announced sanctions on Iran’s biggest cryptocurrency exchange on Tuesday, accusing it of enabling the Iranian government and blacklisted state institutions to circumvent Western sanctions.

The new sanctions ‌follow a Reuters investigation published on May 1 which showed how Nobitex had ​become a central node in a parallel financial system used to process hundreds of millions of dollars for Iran’s central bank and the ⁠Islamic Revolutionary Guard Corps. The report also revealed how Nobitex continued operating even after the ​government-imposed internet shutdown, processing millions of dollars of transactions.

“While Iran’s economy is in free ⁠fall, the regime has chosen to co-opt digital asset technologies for its own corrupt agenda, including evading sanctions and transferring wealth out of the country,” Treasury Secretary Scott Bessent said in an emailed statement.

The Reuters investigation ‌showed how Nobitex is controlled by two brothers from one of Iran’s most ​powerful families, with close ‌ties to the new supreme leader. The two are members of the Kharrazi family, one of the most influential dynasties ‌in the Islamic Republic. Corporate records show that when the exchange started, the brothers were listed under a surname rarely used by members of the family.

The U.S. Treasury announced ⁠Tuesday that the two brothers, Seyed Mohammad ‌Ali Aghamir Mohammad Ali ⁠and Seyed Mohammad Aghamir Mohammad Ali, had also been individually sanctioned, along with the exchange’s chief executive officer, Amir ⁠Hossein Rad.

Nobitex had ⁠provided “significant support” to the Iranian government and facilitated a “significant number” of digital transactions linked to the IRGC and Iran’s central ‌bank, the U.S. Treasury said in the statement. “Following the commencement of U.S. combat operations in Iran, Nobitex played a role in protecting and moving assets and funds out of Iran to shield regime ‌wealth despite ​internet blackouts.”

In an emailed ‌statement to Reuters in April, Nobitex said it had no direct government connections and denied assisting the state. It said that any illicit funds moving through ​Nobitex did so with management approval or awareness. The company also said that the two brothers had never used an alternative identity or changed their identity.