FinCEN seeks tighter controls on crypto mixing services

The proposed rule mandates that regulated financial entities flag transactions suspected of involving crypto mixing, especially those with international implications

article-image

Ink Drop/Shutterstock modified by Blockworks

share

The US Treasury’s Financial Crimes Enforcement Network (FinCEN) is zeroing in on crypto transaction mixers. 

Released Thursday, FinCEN’s Notice of Proposed Rule Making (NPRM) brands crypto transaction mixing as a “primary money laundering concern.” 

The proposal would require regulated financial institutions to report transactions when there is reason to suspect involvement in transaction mixing, particularly concerning activities outside the US.

Mixing is a process that blends different streams of crypto transactions to obscure the original source, thereby making it more difficult to trace individual transactions.

While the proposed rule aims to bolster transparency and curb illicit financial flows, questions remain over its real-world efficacy, particularly given crypto’s inherently decentralized and pseudonymous nature.

The agency’s proposal is part of a broader Treasury offensive against mixing services that began in earnest last year.

Blender.io and Tornado Cash, platforms both implicated in North Korean money laundering activities by US authorities, have spurred regulatory efforts to curb their use.

Read more: Attorneys say DOJ’s Tornado Cash charges contradicted FinCEN guidance

“[Convertible virtual currency] mixing offers a critical service that allows players in the ransomware ecosystem, rogue state actors and other criminals to fund their unlawful activities and obfuscate the flow of ill-gotten gains,” FinCEN Director Andrea Gacki said.

That approach has angered members of the crypto ecosystem. Critics say the Treasury’s Office of Foreign Assets Control, in its fight to clamp down on illicit proceeds, went a step too far — eventually leading to the arrest of a developer and charges against Tornado Cash’s founders.

FinCEN argues its latest proposal aligns with ongoing efforts to counteract a spectrum of threats, from sanctions-dodging countries to groups like Hamas and Palestinian Islamic Jihad.


Get the news in your inbox. Explore Blockworks newsletters:

Tags

Upcoming Events

Old Billingsgate

Mon - Wed, October 13 - 15, 2025

Blockworks’ Digital Asset Summit (DAS) will feature conversations between the builders, allocators, and legislators who will shape the trajectory of the digital asset ecosystem in the US and abroad.

Industry City | Brooklyn, NY

TUES - THURS, JUNE 24 - 26, 2025

Permissionless IV serves as the definitive gathering for crypto’s technical founders, developers, and builders to come together and create the future.If you’re ready to shape the future of crypto, Permissionless IV is where it happens.

Brooklyn, NY

SUN - MON, JUN. 22 - 23, 2025

Blockworks and Cracked Labs are teaming up for the third installment of the Permissionless Hackathon, happening June 22–23, 2025 in Brooklyn, NY. This is a 36-hour IRL builder sprint where developers, designers, and creatives ship real projects solving real problems across […]

recent research

Unlocked by Template (7).png

Research

Union’s improvements upon Tendermint consensus through CometBLS, coupled with ZK proving through Galois, allow for a broadly scalable, cost efficient, and low latency IBC implementation that is feasibly scalable across every existing blockchain, virtual machine and runtime. The implementation offers modular crosschain interoperability without the need for trusted intermediaries.  

article-image

35% of admitted teams are building AI apps, while 30% are using stablecoins

article-image

Those in the US who preregistered for the app got $150 worth of WLD

article-image

The L2 chain with opt-in privacy features was eight years in the making

article-image

Bitcoin stands on the shoulders of these Cypherpunk giants

article-image

Unto’s Will Yoo and Liam Heeger spoke to the Empire newsletter about their raise and how they plan to build Thru

article-image

Greater efficiency, William Jevons predicted, would lead to even greater consumption