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:

  • Blockworks Daily: The newsletter that helps thousands of investors understand crypto and the markets, by Byron Gilliam.
  • Empire: Start your morning with the top news and analysis to inform your day in crypto.
  • Forward Guidance: Reporting and analysis on the growing intersection of crypto and macroeconomics, policy and finance.
  • 0xResearch: Alpha directly in your inbox. Market highlights, data, degen trade ideas, governance updates, token performance and more.
  • Lightspeed: Built for Solana investors, developers and community members. The latest from one of crypto’s hottest networks.
  • The Drop: For crypto collectors and traders, covering apps, games, memes and more.
  • Supply Shock: Tracking Bitcoin’s rise from internet plaything worth less than a penny to global phenomenon disrupting money as we know it.
Tags

Upcoming Events

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.

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.

recent research

morpho 2 graphic.png

Research

Utilizing a ‘DeFi Mullet’ approach, Coinbase’s Bitcoin-backed loans integration with Morpho demonstrates a powerful blueprint for CEXs to monetize dormant assets by expanding adoption of wrapped products (cbBTC, USDC) while also supporting native and/or preferred DeFi ecosystems (Base) which can further lead to downstream growth in onchain liquidity and increased utilization of the related assets.

article-image

With much of the bitcoin mining supply chain based in Asia, US-based operations now face higher equipment prices

article-image

Anticipating an economic downturn, venture firms may be less likely to invest

article-image

Trump’s tariffs may have potentially significant impacts on GDP, household spending and food prices — if they hold

article-image

The Binance-affiliated stablecoin lost about $200M of market capitalization

article-image

How the Bitcoin conversation has evolved since the price was less than $1

article-image

The platform also rolled out 13 tokenized funds for institutions on the Connect platform