CoinDesk
The U.S. Treasury added four TRON-based crypto wallets linked to the Central Bank of Iran to its sanctions list on Tuesday, prompting Tether to freeze $131 million in USDT held at those addresses. The wallets had previously received more than $165 million in stablecoins, according to Chainalysis, though some of the funds had moved before the freeze landed.
The freeze targets addresses that held over $165 million, preventing those specific funds from being transferred or redeemed, while the frozen tokens remain visible onchain. This action brings the total amount of blocked USDT linked to Iran's central bank to roughly $475 million, layered on top of the $344 million Tether froze in April.
Why it matters
The move gives every exchange, custodian, and compliance team a clean reference list of addresses to screen against, raising the cost for any venue that lets those wallets touch its rails. OFAC has cautioned that its published wallet list is not exhaustive, meaning other addresses controlled by the bank may still qualify as blocked property under the same designation. The Central Bank of Iran has been sanctioned under U.S. counterterrorism authority since 2019 over its support for the Islamic Revolutionary Guard Corps-Quds Force and Hezbollah; Tuesday's update expands that designation rather than opening a new line.
Market impact
Tether's ability to freeze $131 million in a single action underscores how the largest stablecoin issuer now functions as a real-time sanctions enforcement node, even though the freeze is not a seizure and the underlying funds remain under the wallets' nominal control. Chainalysis traces the inbound flows to an institutional liquidity provider and an Asia-based payment processor, which gives compliance teams two upstream counterparties to map. The action follows OFAC's June sanctions on Nobitex and other Iranian exchanges accused of helping the central bank move in and out of stablecoins, tightening the net on Tehran's stablecoin rails just as Iran has leaned harder on USDT to support the rial.
Frequently asked questions
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What did the U.S. Treasury actually do on Tuesday?
OFAC added four TRON-based crypto wallets linked to the Central Bank of Iran to its sanctions list. Tether then froze $131 million in USDT held at those addresses, which Chainalysis says had previously received over $165 million in stablecoins.
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Is the freeze a seizure of the funds?
No. The frozen USDT remains visible onchain and is still under the nominal control of the Iran central bank's wallets, but the addresses can no longer transfer or redeem the tokens.
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How much USDT is now blocked in total?
Roughly $475 million in USDT is now blocked across Tether's April and Tuesday actions. Elliptic estimates Iran's central bank has accumulated at least $507 million in USDT overall, much of it used to support the rial.
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Does this create a new sanctions program against Iran?
No. The Central Bank of Iran has been sanctioned under U.S. counterterrorism authority since 2019 over its support for the IRGC-Quds Force and Hezbollah. Tuesday's update expands that existing designation rather than imposing a new one.
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What should exchanges and compliance teams do with this?
OFAC's published wallet list gives venues a ready-made set of addresses to screen against, though the agency warned the list is not exhaustive. The action also follows June's sanctions on Nobitex and other Iranian exchanges, tightening the net on Tehran's stablecoin rails.
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