Crypto Mixers Surge as Rules Struggle to Keep Up
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Following the crackdown on Tornado Cash by US regulators in 2022, the expectation was straightforward: eliminating the tool would resolve the issues surrounding illicit activities. However, this approach has not yielded the anticipated outcomes.
Recent findings from the Cambridge Centre for Alternative Finance (CCAF) indicate a notable resurgence in the use of crypto mixers, approaching levels seen before the enforcement actions. Interestingly, the data reveals that the sanctions have impacted regular users more than they have deterred criminals, who have quickly adapted.
In 2025, researchers Wenbin Wu and Keith Bear observed that the frequency of crypto mixer transactions soared to roughly 32,000, a substantial increase from the approximately 21,000 recorded in 2024 and 16,000 in 2023. This trend has been particularly pronounced since the US Treasury lifted its sanctions against Tornado Cash on March 21, 2025.
Currently, Railgun dominates the mixer market, accounting for 71% of the total transaction volume. Tornado Cash follows, representing about 25%, while Privacy Pools captures the remaining 5%. Both Railgun and Privacy Pools implement measures to screen out known problematic addresses; however, CCAF highlights a significant limitation—these blacklists are updated only as new threats emerge, resulting in a gap where illicit funds can still enter the system.
The sanctions initially caused considerable disruption; Tornado Cash saw its daily transactions plummet by 97% within days, with the overall mixer market volume dropping by 45%. Yet, this disruption did not uniformly affect all users.
Wu noted that the sanctions were more effective at deterring compliant users rather than illicit actors, who shifted to alternative platforms and decentralized exchanges. This migration reflects a change in deposit patterns as well. Prior to the crackdown, centralized exchanges—which require identity verification—were significant contributors to mixer funding. Post-ban, however, these deposits disappeared, leaving 95% of mixer funding in 2025 coming from unlabelled wallet addresses without any identifiable ties, compared to just 76% in 2020.
Moreover, the timing of transactions has shifted dramatically. Previously, most activities occurred over 24 hours after wallet creation, but that pattern has reversed. Researchers attribute this quicker behavior to users’ desire to evade detection.
Despite these changes, a paper published by the Federal Reserve Bank of St. Louis in 2023 revealed that only around 30% of Tornado Cash’s traffic could be traced back to illicit activities, suggesting that the narrative surrounding crypto mixers and crime may be more complex than it initially appears.
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Raj Patel
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