Gene Lange, the Treasury's Under Secretary for Terrorism and Financial Intelligence, sent a letter to Binance in recent weeks directing the exchange to cooperate fully with its monitoring program, including the timely sharing of data records and documents, according to reporting by The Block on May 7. The letter arrives as separate investigations and congressional inquiries allege that Binance accounts were used to route funds to groups connected to Iran, circumventing U.S. sanctions that carry severe financial and criminal penalties.

The Allegations in Brief

Internal investigators estimated that more than $1 billion in Iran-linked flows passed through the platform. A February inquiry opened by Senator Richard Blumenthal of Connecticut cited a higher figure of $1.7 billion. That inquiry also alleged that funds were routed in connection with Russia's Shadow Fleet, a dimension of the investigation not addressed in Binance's public responses. Approximately 2,000 Binance accounts were associated with Iranian entities, according to the Blumenthal inquiry. Investigators identified the primary transfer mechanism as Tether (USDT), a dollar-pegged stablecoin, routed through the Tron blockchain. Tron is frequently used for this purpose because its transaction fees are low and its throughput is high, making it attractive for moving large volumes of value quickly and at minimal cost.

Two VIP accounts sit at the center of the alleged scheme. A 79-year-old Chinese trader is said to have transferred $439 million in digital tokens to wallets that ultimately routed to Iran-linked clusters. A 38-year-old Chinese trader is alleged to have sent nearly $200 million in Tether through intermediary wallets tied to the same destination. Investigators flagged that both accounts were accessed from the same device, a pattern that raises what compliance professionals call "beneficial ownership" concerns, meaning the accounts may have been controlled by the same undisclosed party. A Hong Kong entity named Blessed Trust is alleged to have funnelled roughly $1.2 billion through Binance to Iran-linked clusters. Another intermediary called Hexa Whale was named in both Blumenthal's inquiry and in separate investigative reporting by Fortune.

Former federal prosecutor Amanda Wick told Fortune in March that the transaction patterns described were not ambiguous. "This is not merely a red flag, it is an immediate escalation trigger," she said. On the shared-device finding, Wick said: "If two ostensibly unrelated VIP clients were also found to be accessing accounts from the same device, that would raise serious beneficial ownership concerns."

Investigators Fired, Compliance Leadership Departing

The reporting was triggered in part by the dismissal of at least five internal compliance investigators, many of them with law enforcement backgrounds in Europe and Asia, who were let go in late 2025 after submitting internal reports flagging the suspected Iran flows. Sanctions expert Robert Appleton called the situation striking. "That's rather shocking that that happened under a monitorship," he told Fortune in February.

The compliance leadership bench has thinned further since then. Chief Compliance Officer Noah Perlman, who joined Binance in 2023, has signalled plans to transition out, though the departure has not been formally confirmed. At least four other senior compliance staff have left in recent months, Bloomberg reported in April.

Binance has denied wrongdoing. The company stated it "categorically did not directly transact with any sanctioned entities" and found no evidence of sanctions violations in its own internal review. The exchange says it offboarded suspicious accounts and reported them to law enforcement. Binance has also filed a lawsuit against the Wall Street Journal over related reporting, though the allegations detailed in this article draw primarily from Fortune's investigative series.

The Monitorship and Its Complications

Binance's oversight obligations stem from a landmark November 2023 guilty plea in which the exchange admitted to conspiracy to violate the Bank Secrecy Act, failing to register as a money transmitting business, and breaching the International Emergency Economic Powers Act (IEEPA). The settlement totalled $4.3 billion, the largest ever for a crypto company, including nearly $1 billion specifically to settle OFAC (Office of Foreign Assets Control) sanctions violations. As part of the deal, two independent monitors were installed: one reporting to the Justice Department and one reporting to the Financial Crimes Enforcement Network (FinCEN). The FinCEN monitorship runs for five years and the DOJ monitorship runs for three years. Neither monitor has made public statements about their findings. Reports from early 2025 that the Justice Department informally paused some corporate monitorships, including those covering Glencore and Boeing, have raised questions about whether Binance's oversight faced similar disruption. Treasury's letter suggests the program is still formally in force, but that cooperation has been a point of friction.

Binance founder Changpeng Zhao, who served a four-month prison sentence for his role in the 2023 case, received a presidential pardon from President Trump in 2025. Senator Blumenthal said in February that Binance had "sought to evade accountability and influence the White House through lobbying" and alleged that the company "appears to have ignored clear warning signs, knowingly allowed illicit accounts to operate, and even provided hands-on support to entities engaged in money laundering." Binance disputes these characterisations.

Stakes for Users in South Asia and Africa

The regulatory pressure carries direct consequences outside the United States. Binance holds roughly 39 percent of global centralized exchange volume and serves an estimated 280 to 300 million users. India alone accounts for approximately 93.5 million crypto users, Pakistan around 18.2 million, and Nigeria roughly 13.3 million, according to industry estimates. South Asia posted about $300 billion in crypto transaction volume in the first half of 2025, an 80 percent increase year over year.

To understand why Iran-linked flows of this scale are plausible, some context is useful. Iran has developed a substantial crypto economy estimated at roughly $7.78 billion. The Islamic Revolutionary Guard Corps is among the entities that have used digital assets to move funds outside the reach of international sanctions, and Bitcoin mining has become an important revenue channel for Iranian actors seeking to generate difficult-to-trace income.

The stablecoin and blockchain combination at the center of the sanctions allegations, USDT on Tron, is also a primary channel for informal crypto remittances across South Asia and Sub-Saharan Africa. Any regulatory response that restricts those flows on Binance would hit corridors that millions of households rely on for cross-border transfers. Nigeria carries additional exposure. The country detained Binance executive Tigran Gambaryan in 2024 in a separate regulatory dispute and subsequently issued an $81.5 million tax assessment against the exchange. These are two distinct actions whose precise relationship and sequence remain subjects of ongoing reporting.

The path forward depends on whether the Justice Department and Treasury pursue fresh enforcement or allow the existing monitorship to run its course. Congressional pressure has mounted on multiple fronts. Senator Blumenthal's inquiry represents one vector; separately, Senator Van Hollen and Banking Committee Democrats have pressed Attorney General Bondi and Treasury Secretary Bessent directly to investigate Binance. With compliance leadership in flux and the DOJ investigation still active, Binance enters the back half of 2026 navigating one of the most consequential compliance tests in the industry's history.