Binance vs. Whistleblowers: The $1B Iran Sanctions Breach Allegation

Binance is back in the spotlight. Former compliance investigators now claim the exchange allegedly processed more than $1B in transactions tied to Iran sanctions violations, even while operating under U.S. monitorship after its 2023 plea deal.

Changpeng Zhao is not staying quiet. Instead of denying activity outright, he argues the investigators were fired for failing to stop the breaches, not for exposing them.

Now the fight is turning public, risking a return of regulatory pressure just as Binance tries to steady its global footing.

What is the $1B Sanctions Breach Allegation?

Five former Binance investigators say they were fired after uncovering major sanctions breaches. They claim wallets tied to Iranian entities, including the exchange Nobitex, allegedly moved around $1B through Binance even after the November 2023 DOJ settlement.

These investigators worked on chain forensics. They say bad actors used obfuscation methods to slip past screening systems. When they flagged it internally, they allege the response was not corrective but retaliatory.

Binance is still under a three-year monitorship from the DOJ and FinCEN, which means any compliance failure carries extra weight.

The Whistleblowers’ Case: Retaliation or Restructuring?

The former employees are framing this as whistleblower retaliation. They say once they flagged the $1B exposure, they became a problem for an exchange trying to show regulators it had cleaned up.

In their view, the issue was not just the transactions. It was how Binance handled the discovery. They argue the exchange focused more on containing the fallout than fixing the screening gaps.

They also point to the size of the flows as proof that automated filters were not catching everything. If the system failed and the people who caught it were removed, that would weaken internal defenses.

CZ’s Defense: ‘Fired for Cause’

CZ is pushing back as he always does. He says this is not whistleblower retaliation. It is a performance issue. If investigators uncovered $1B in illicit flows, why were those flows not stopped in the first place?

Binance claims the departures were part of a compliance overhaul. The company says it brought in stronger talent and points to a 97% drop in sanctions related transaction volume between early 2024 and mid 2025 as proof that reforms are working. It denies firing anyone for reporting violations.

The stakes are huge. Binance already paid $4.3B in penalties tied to AML and sanctions failures and is operating under a DOJ monitorship. If regulators conclude the exchange ignored new violations or retaliated against staff, it could jeopardize that agreement.

Everything hinges on intent. If the firings were performance based, fallout may be limited. If not, regulatory pressure could intensify fast.

Ultimately, the outcome of this dispute will likely hinge on the internal documentation of the firings. If the data supports CZ’s claim of incompetence, Binance moves on.

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