The US Treasury named Bitcoin (BTC) as the payment rail for Iran's Strait of Hormuz insurance scheme when it sanctioned the two firms running it yesterday. It did not publish a single wallet address.
The Treasury describes the arrangement as an extortion network. The two designated firms, Persian Gulf Marine Insurance Company and HormuzSafe Marine Services Authority, require commercial vessels to buy mandatory cover before passing through the Strait, insuring them against hazards, including seizure, that Treasury says Iran itself creates. Hormuz carried 14.6mn barrels of oil and petroleum liquids a day in the first quarter, down from 20.7mn in the final quarter of 2025, according to the Energy Information Administration. The tollgate sits on a corridor that has thinned but not closed.
That is what makes the missing addresses matter. The Office of Foreign Assets Control (OFAC), an agency within the Treasury Department tasked with enforcing trade sanctions, designated both firms under Executive Order 13902, handing compliance teams a corporate name, an address at the Iranian port of Bandar Abbas and a website. None of it functions onchain. Screen a bank wire against that entry and it stops. Screen a Bitcoin payment against it and there is nothing to match.
What OFAC chose not to publish
OFAC has the tool and uses it selectively. On 24 Apr it updated its Central Bank of Iran designation and added two digital currency addresses, the sort of identifier that exchanges, custodians and analytics firms can act on the same day. The 29 Jul entry carries none. Neither did June's designation of Nobitex, Iran's largest exchange.
The designation therefore bites the hardest on the least likely payment method. A shipowner paying Tehran through a correspondent bank is caught by its own compliance stack. An owner paying in Bitcoin is caught only by its own disclosure.
Why the timing beats the target
Iran is not currently charging for transits, although accounts differ: one report has Tehran collecting tolls since the spring, while the terms document circulated by the IRGC-backed Persian Gulf Strait Authority, seen by Lloyd's List, states passage is free until the window closes. Under the Islamabad memorandum that took effect on 18 Jun, passage is free for 60 days, a window closing around 17 Aug, and the PGSA, itself designated on 27 May, has reserved the right to introduce fees once it expires. This is not enforcement against a revenue stream. It is a designation of the till roughly three weeks before the till opens.
Hormuz Safe was developed by Iran's Ministry of Economy and went live in May, issuing policies that activate on blockchain confirmation. Both designated entities were incorporated this year. "With its economy in freefall, the regime is desperate for cash," Treasury Secretary Scott Bessent said.
The clause that shut the middle option
For an owner weighing whether to pay, the binding constraint is not the SDN list. It is LMA5708, the model condition the Lloyd's Market Association published on 23 Jul, which bars payment of any transit fee, toll, charge or other consideration, explicitly including non-financial consideration, by any means, directly or indirectly. Crypto is not an edge case in that drafting. It is the anticipated case.
If the condition is breached, insurers are irrevocably discharged of their obligations, both for the payment and for the vessel itself. That is harder than the 'cover ceases' shorthand now circulating: the wording strips the indemnity rather than lapsing the policy.
The secondary sanctions flag on both Iranian entities is the part reaching beyond US individuals, which matters because very little Hormuz tonnage is US-flagged.
The gap Iran appears to be aiming at
The clause leaves one opening. It carves back charges levied only for specific maritime or navigational services rendered to a vessel that are permissible under the UN Convention on the Law of the Sea. Article 26 of that convention prohibits charges for passage alone, while permitting them as payment for specific services rendered to a ship.
Hormuz Safe advertises traffic control, security, emergency response and insurance. Those happen to be precisely the categories Article 26 permits a coastal state to charge for, and the same ones LMA5708 carves back. Iran's sales pitch reads as though it were written with both documents open on the desk.
The ledger Tehran cannot delete
Iran chose Bitcoin because the enforcement it fears is bank-centric. Yet Bitcoin's ledger is designed not to forget.
A dollar payment through a compliant institution creates a record sitting behind subpoenas and jurisdictional argument. A Bitcoin payment to Hormuz Safe creates a permanent public entry that anyone can read, and which becomes retroactively actionable the moment OFAC publishes the receiving address. Every owner who pays in the coming fortnight is writing durable evidence against itself into a database it cannot amend.
Treasury has not published those addresses, though it has not indicated that it will not.
