Crypto exchange Kraken briefly locked some customers out of their accounts after nearly 12,000 low-value transfers from wallets linked to rival HTX—a platform under European Union sanctions—landed in customer deposit addresses between Aug. 17 and Aug. 24.

Market Context

The dust attack unfolded as the EU's transaction ban on HTX took effect on Aug. 23, adding pressure on exchanges to screen for sanctioned entities. The U.K. had already frozen HTX assets in May over allegations the platform provided financial services to Russia-linked payment network A7 and crypto exchange Garantex, which itself faces sanctions.

Analysis

Kraken's compliance team restored access while continuing to hold the flagged funds and is working with authorities to prevent future attacks of this nature. Arkham Intelligence identified wallet addresses involved in the campaign, though transactions could have been initiated by third parties rather than HTX directly. The exchange stated it does not know who orchestrated the attack but noted that the tactic appears designed to weaponize sanctions compliance systems against ordinary users.

HTX, which counts TRON blockchain founder Justin Sun as an adviser, said its internal review found no official accounts were responsible for related microtransactions and is investigating whether the sending wallet was misidentified or a third party was acting without authorization. The company has rejected U.K. allegations linking it to sanctioned Russian financial networks.

The dust attack strategy exploits public blockchain transparency—anyone can send crypto to any address, creating a link between sanctioned funds and an otherwise unrelated user at minimal cost. This turns standard compliance screening into a vector for disruption rather than protection against bad actors.

Key Numbers

- Nearly 12,000 low-value transactions sent from HTX-linked wallets during the Aug. 17-24 period

- Transaction values ranged from "a few cents to a few dollars" each per Kraken's description

- EU transaction ban on HTX took effect Aug. 23 while transfers were occurring

- U.K. sanctioned HTX in May, imposing an asset freeze over alleged ties to A7 and Garantex

What to Watch

Kraken's investigation outcome and any coordination with regulators; potential for similar dust attacks against other exchanges as EU sanctions enforcement intensifies; whether HTX provides clarity on the source of transactions from its labeled wallets. The incident highlights ongoing friction between blockchain transparency and privacy, particularly for users who may receive unsolicited small transfers from sanctioned entities.