A newly released report from Senate Democrats alleges that the Iranian government and its regional proxies, including Hezbollah, have been heavily utilizing Tether’s dollar-pegged stablecoin, USDT, to bypass U.S. economic sanctions and facilitate covert financial transactions.
According to findings by the Permanent Subcommittee on Investigations, which were reviewed by The Wall Street Journal, the widely used cryptocurrency has increasingly functioned as a primary payment rail for Tehran. The investigation asserts that the digital asset has become a cornerstone for funding terrorist proxy groups, operating as an essential tool within Iran’s expanding shadow financial network.
Tether’s USDT currently dominates the stablecoin sector, accounting for approximately 60 percent of the total market capitalization for stablecoins. Because the token is pegged directly to the United States dollar, it maintains a stable value that shields holders from the high price volatility typically associated with other cryptocurrencies like Bitcoin or Ethereum. While this stability has made USDT popular for legitimate digital commerce, it has also made the token an attractive vehicle for illicit financial activities, including cross-border money laundering and sanctions evasion, as highlighted by financial watchdogs.
The release of the subcommittee’s findings coincides with an intensified economic squeeze by the U.S. Department of the Treasury. American authorities have systematically tightened financial restrictions following U.S. military strikes in Iran earlier this year, a campaign that included the implementation of operations such as Operation Economic Outcast in August.
The Senate probe was led by Senator Richard Blumenthal of Connecticut. Investigators under his supervision conducted a comprehensive review of 846 digital wallet addresses that had previously been sanctioned by the governments of the United States and Israel due to their direct or indirect ties to the Iranian regime. The analysis yielded a striking statistic: 84 percent of those scrutinized wallets engaged in transactions exclusively, or almost exclusively, using Tether’s USDT.
Senator Blumenthal emphasized the severity of the findings in statements provided to The Wall Street Journal. He stated that the report exposes how Tether and its flagship digital token have become central to Iran’s shadow banking system, enabling the Iranian government to sustain the funding of its regional proxies, carry out human rights abuses, and pursue hostile drone and missile programs in direct defiance of international and U.S. sanctions regimes.
Despite the mounting scrutiny from lawmakers and regulatory bodies, representatives for Tether did not immediately return requests for comment regarding the subcommittee’s findings. However, company officials have previously maintained that they cooperate closely with international law enforcement agencies and blockchain intelligence firms. Tether has routinely taken steps to freeze specific digital wallets linked to illicit actors, state-sponsored cybercriminal operations, and sanctioned entities when requested or alerted by authorities.
Furthermore, recent on-chain analytics suggest that the Iranian regime’s reliance on USDT may be experiencing a downward shift. Data compiled by blockchain intelligence firm TRM Labs indicates that the share of transaction volume attributed to USDT within Iran-associated wallets has declined over recent years. Specifically, USDT accounted for approximately 72 percent of identified volume in Iran-attributed wallets in 2024, decreasing to 67 percent in 2025, and dropping more sharply to roughly 14 percent of measured on-chain volume by the month of August.
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