Two IRGC-linked entities and eight shadow-fleet tankers were designated on 29 July, cutting the digital rail Tehran opened in May to charge Strait of Hormuz tolls in bitcoin and USDT.
The US Treasury's Office of Foreign Assets Control designated the Persian Gulf Marine Insurance Company and HormuzSafe Marine Services Authority on 29 July, cutting off the two front companies Iran had built to charge Strait of Hormuz transit fees in bitcoin. Eight shipping companies and eight tankers were blocked in the same action.
Iran's scheme was crude. The Islamic Revolutionary Guard Corps stood up a mandatory insurance regime for commercial vessels crossing the Strait, then priced the policies in digital assets to route around Western banks. The risks the coverage supposedly indemnified — vessel seizures, harassment by fast-attack craft, cargo delays — were the same risks Iran itself creates. Refuse the policy and the IRGC becomes the problem you needed insurance for.
Treasury Secretary Scott Bessent framed the designation in the language of a cornered adversary. "With its economy in freefall and inflation in the triple digits, the regime is desperate for cash," he said in the announcement. The State Department's shorthand was blunter: extortion.
The pattern was public before the sanctions arrived. In May, Iran's Ministry of Economy publicised the framework as a legitimate maritime insurance product and told domestic outlets it expected ten billion dollars in annual receipts. The 29 July action does not attempt to quantify how much of that target Iran actually collected. It targets the plumbing.
The mechanics of the response matter more than the political framing. OFAC's designations mean US persons must block any property under their control that belongs to the designated entities and report the holdings within ten business days. The obligation extends to any exchange, custodian, or software provider inside US jurisdiction that has touched addresses attributable to the sanctioned parties. Persian Gulf Marine, HormuzSafe, and the eight vessels named in the notice are now blocked property. Secondary sanctions exposure for foreign persons who continue to transact with them turns on conduct and the closeness of the tie to the United States.
The digital-asset side of that scope is not new. OFAC has been clear since the Tornado Cash designations in 2022 that a bitcoin address associated with a sanctioned person is itself blocked property, and the Alexey Pertsev prosecution in Amsterdam extended the theory into European criminal law. Chainalysis and TRM Labs both sell screening tools built for exactly this class of transfer, and centralised exchanges use them as gatekeepers. Any counterparty that routed a shipping-toll payment through a screened venue in the last three months is now visible to compliance.
Iran's design was always going to test the machinery. The ministry described bitcoin and USDT as accepted rails, which pushed part of the flow onto Tether. Tether has frozen sanctioned wallets before, but its response times have been uneven and its willingness to act against foreign-state actors more uneven still. The 22 identification updates OFAC pushed alongside the new designations tighten the monitoring file across the board; compliance teams at digital-asset firms will need to re-run screens against the refreshed data.
The eight tankers are the largest operational component. Treasury lists them as shadow-fleet vessels: older, insurance-poor tonnage registered through Marshall Islands, Hong Kong and Chinese shell companies, used to move Iranian oil to buyers who cannot pay through the correspondent-banking network. Blocking the ships as property means US-controlled ports, insurers, and classification societies must refuse them. In practice most of the tankers never come near a US port. The deterrent is that any Western commercial counterparty exposed to them now has a compliance file to answer for.
OFAC has telegraphed for two years that it treats crypto payment rails as an extension of the sanctions perimeter, not an escape from it. The Iran maritime scheme was the most public attempt any sanctioned state has made to test whether that perimeter would hold at scale. Two months after the launch, Treasury's answer is a designation package that names the vehicles by hand, blocks the ships, and refreshes the identifiers the industry uses to screen. Iran will substitute new vehicles. The front companies that gave the scheme a public face are done.
