What to Know

  • The U.S. Treasury Department sanctioned crypto exchanges Shelbit Exchange and Iran-based Aban Tether.
  • The Treasury’s Office of Foreign Assets Control said the exchanges helped Iran move money outside the traditional banking system and evade sanctions.
  • OFAC also sanctioned Siavash Kayvanpour and several companies tied to him in Georgia, Poland and the United Arab Emirates.
  • The Treasury said IRGC-linked wallets sent more than $1 million in crypto to Shelbit addresses, while more than $2 million moved from Shelbit addresses to IRGC wallets.
  • Wallets belonging to or controlled by Kayvanpour sent over $2 million to Nobitex, Iran’s largest crypto exchange, the Treasury said.
  • Aban Tether processed millions of dollars in transactions involving sanctioned Iranian exchanges, including Nobitex, Wallex, Bitpin and Ramzinex, according to OFAC.
  • The action extends a 2026 crackdown that has also targeted Nobitex, other Iranian exchanges and crypto wallets linked to Iran’s central bank.
  • The sanctions come amid the U.S.-Iran war, raising compliance pressure on stablecoin issuers and exchanges handling funds connected with Iranian entities.

Washington Widens Its Crypto Enforcement Campaign

The U.S. Treasury Department has expanded its campaign against Iran-linked digital asset activity by sanctioning Shelbit Exchange and Iran-based Aban Tether, alleging that the platforms helped Tehran move funds outside the traditional banking system. The designations mark another escalation in Washington’s effort to cut sanctioned Iranian actors off from crypto rails, foreign currency channels and shadow banking networks that officials say support the Islamic Revolutionary Guard Corps.

The Treasury’s Office of Foreign Assets Control targeted the two exchanges in a Friday action that also named Siavash Kayvanpour and several companies tied to him in Georgia, Poland and the United Arab Emirates. The move broadens the enforcement perimeter beyond crypto trading venues and into the corporate structures and foreign exchange channels that U.S. officials say can help sanctioned entities route money across borders.

The action underscores how digital assets remain a central point of concern for sanctions enforcement. Crypto networks can provide fast cross-border settlement and may be attractive to entities that have lost access to correspondent banks or mainstream financial institutions. At the same time, public blockchains can leave transaction trails that investigators, compliance teams and analytics firms are able to review when tracing flows linked to sanctioned wallets or designated counterparties.

OFAC Details Alleged Flows Through Shelbit

OFAC said wallets linked to the Islamic Revolutionary Guard Corps sent more than $1 million in crypto to Shelbit addresses. The Treasury also said more than $2 million flowed from Shelbit addresses to IRGC wallets. Those alleged transactions placed Shelbit at the center of the latest sanctions action and highlighted the role that exchange deposit and withdrawal addresses can play in enforcement cases.

The Treasury also focused on transactions tied to Kayvanpour. Wallets belonging to or controlled by Kayvanpour sent over $2 million to Nobitex, Iran’s largest crypto exchange, according to the agency. Nobitex has already been a major focus of the U.S. campaign against Iran-linked crypto finance, and its repeated appearance in enforcement actions shows how Washington is seeking to isolate nodes it views as important to Tehran’s digital asset infrastructure.

For exchanges and wallet providers, the allegations reinforce a key compliance challenge: the same address can appear routine in ordinary transaction monitoring until it is linked with a broader sanctions network. Once OFAC identifies a wallet, entity or intermediary as part of a prohibited network, platforms that previously handled related flows may face scrutiny over controls, screening practices and the speed with which they blocked or reported suspect activity.

Aban Tether Draws Scrutiny Over Transactions With Sanctioned Exchanges

Aban Tether was also designated by OFAC, with the Treasury saying the Iran-based exchange processed millions of dollars in transactions involving sanctioned Iranian exchanges. The named counterparties included Nobitex, Wallex, Bitpin and Ramzinex. The exchange does not appear to be connected to stablecoin issuer Tether, though the similar name is likely to attract attention from market participants and compliance teams monitoring stablecoin-related exposure.

The distinction matters because stablecoins have become a major part of global crypto settlement activity. Many market participants use dollar-linked tokens as a bridge between exchanges, trading venues and over-the-counter desks. When sanctioned entities attempt to use stablecoins or platforms that support them, issuers and intermediaries face pressure to identify exposure, freeze assets where required and prevent prohibited users from moving value through their systems.

OFAC’s focus on Aban Tether also illustrates a broader enforcement theme: sanctions risk is not limited to the direct transfer of funds to a sanctioned government body or military organization. Platforms may be scrutinized for processing flows that involve sanctioned exchanges, shell companies, foreign exchange houses or intermediaries that officials say are part of a wider effort to move money for Iran’s shadow banking system.

Shadow Banking Network Also Targeted

Alongside the crypto exchange designations, OFAC sanctioned a network of foreign exchange houses, shell companies and individuals that it said helped Iran’s shadow banking system move hundreds of millions of dollars, including funds tied to overseas oil sales. The combined action shows that Washington is treating crypto finance and traditional informal financial channels as interconnected parts of the same enforcement problem.

Shadow banking networks can use layers of companies, brokers and currency dealers to obscure the origin, destination and beneficial ownership of funds. When crypto exchanges or wallets are added to that structure, investigators may need to connect on-chain activity with off-chain records, corporate registries, exchange accounts and foreign exchange transactions. That mix of digital and traditional finance creates a complex compliance environment for platforms serving customers across multiple jurisdictions.

Treasury Secretary Scott Bessent said the Iranian regime’s reliance on digital assets and shadow banking networks is evidence that Economic Fury is working. He added that whether funds are moving in dollars, rials or crypto, Treasury will hunt down and dismantle illicit financial networks that keep the regime afloat. The statement signals that U.S. authorities view crypto sanctions enforcement as part of a broader financial pressure strategy rather than a standalone digital asset initiative.

Sanctions Pressure Builds Amid the U.S.-Iran War

The designations come amid the U.S.-Iran war, a backdrop that has raised the stakes for Washington’s effort to cut Tehran off from foreign currency and global financial markets. In periods of geopolitical conflict, financial sanctions often become a central tool of state policy, and digital asset platforms can find themselves under heightened pressure to detect exposure to sanctioned parties quickly.

For stablecoin issuers, centralized exchanges and over-the-counter trading desks, the latest action is another warning that Iran-linked flows remain a priority for U.S. authorities. Platforms that support dollar-linked tokens, cross-border transfers or fiat on-ramps may need to maintain screening processes that cover sanctioned entities, associated wallets, known exchange clusters and indirect exposure through intermediaries.

The enforcement challenge is particularly significant because crypto transactions can move rapidly across borders and through multiple wallets before reaching a final destination. Even so, blockchain activity is often traceable in ways that cash or opaque shell-company transfers are not. That public record can help investigators reconstruct transaction pathways, but it can also create lasting evidence that compliance teams must evaluate when historical activity becomes linked to newly sanctioned entities.

A String of Actions Against Iran-Linked Crypto Finance

Friday’s sanctions are the latest in a series of U.S. measures against Iran-linked crypto finance. In January, the Treasury sanctioned Zedcex and Zedxion, which were the first crypto exchanges targeted under its Iran-specific financial sanctions. In June, the Treasury blacklisted Nobitex and several other Iranian crypto exchanges as part of its campaign against Tehran.

Last month, the U.S. sanctioned four crypto wallets linked to Iran’s central bank. After that action, Tether, the issuer of USDT, froze about $131 million held in the wallets. The Treasury also sanctioned two Iranian maritime insurance entities over an alleged scheme that funneled funds to the IRGC. Together, those steps show a widening focus on exchanges, wallets, issuers, insurers, oil-related funds and intermediaries that U.S. officials say support sanctioned Iranian activity.

The extension of the crackdown to Shelbit and Aban Tether suggests that additional platforms could face scrutiny if they are alleged to have processed funds for sanctioned entities or interacted with previously designated Iranian exchanges. Market participants will be watching whether the next phase of enforcement focuses on more exchange addresses, over-the-counter brokers, stablecoin movements or foreign companies that allegedly provide support services to Iranian financial networks.

Compliance Implications for Crypto Firms

The sanctions place renewed pressure on crypto companies to strengthen sanctions screening and transaction monitoring. Exchanges may need to evaluate both direct and indirect exposure to Iranian-linked wallets, including activity routed through counterparties that have interacted with designated platforms. Stablecoin issuers, meanwhile, may face expectations to freeze assets when wallets are sanctioned or when transactions are linked to prohibited actors.

For market participants, the central issue is not only whether a platform directly served a sanctioned entity, but whether its controls were robust enough to identify suspicious patterns involving known Iranian exchanges or related wallets. In practice, that can require the use of blockchain analytics, customer due diligence, entity screening, withdrawal monitoring and escalation procedures for high-risk transactions.

The latest action also reinforces that sanctions enforcement in crypto is increasingly global. OFAC’s designations tied companies and individuals to jurisdictions including Georgia, Poland and the United Arab Emirates, illustrating how U.S. authorities may pursue networks that operate beyond Iran’s borders. For digital asset firms with international customers, the message is clear: sanctions risk can emerge through counterparties, affiliates, intermediaries and off-platform relationships, not just through direct account holders.

Frequently Asked Questions (FAQs)

Which crypto exchanges did the U.S. Treasury sanction?

The U.S. Treasury sanctioned Shelbit Exchange and Iran-based Aban Tether, alleging that they helped Iran move money outside the traditional banking system and evade sanctions.

What role did OFAC play in the action?

The Treasury’s Office of Foreign Assets Control issued the designations. OFAC is the U.S. sanctions authority responsible for targeting individuals, entities and networks accused of violating or helping evade U.S. sanctions.

Why was Shelbit targeted?

OFAC said IRGC-linked wallets sent more than $1 million in crypto to Shelbit addresses and that more than $2 million flowed from Shelbit addresses to IRGC wallets.

Why was Aban Tether sanctioned?

The Treasury said Aban Tether processed millions of dollars in transactions involving sanctioned Iranian exchanges, including Nobitex, Wallex, Bitpin and Ramzinex.

Is Aban Tether the same as stablecoin issuer Tether?

Aban Tether does not appear to be connected to stablecoin issuer Tether. The similar naming may draw attention, but the sanctioned exchange is described as Iran-based Aban Tether.

How does this relate to Nobitex?

Nobitex, Iran’s largest crypto exchange, has been a recurring focus of U.S. sanctions activity. Wallets belonging to or controlled by Siavash Kayvanpour sent over $2 million to Nobitex, according to the Treasury.

What does this mean for stablecoin issuers?

Stablecoin issuers may face greater pressure to identify sanctioned wallets, freeze prohibited funds when required and prevent Iranian-linked entities from using dollar-linked tokens to move value.

Why are crypto transactions important in sanctions cases?

Crypto can offer a route for sanctioned entities to move funds when banks cut them off, but blockchain transactions can also create public records that investigators and analytics firms can trace.

What is the broader message for crypto exchanges?

The broader message is that exchanges must monitor for direct and indirect exposure to sanctioned entities, including transactions involving known Iranian exchanges, related wallets and shadow banking intermediaries.

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