What Is a Mixer?
A mixer (or tumbler) takes coins from many people, stirs them, and sends out different coins. The goal is to break the obvious link between the address that sent and the address that received. On-chain analytics, the kind reviewed in Arkham, exist specifically to undo sloppy versions of this.
How It Actually Works
- Custodial mixers take your coins and promise different coins back. You have handed a stranger a pile of bearer assets. Many of these were scams or law-enforcement magnets.
- Non-custodial protocols (Tornado-style pools) use smart contracts and cryptography so the operator, in theory, cannot steal the pile. The U.S. Treasury still sanctioned Tornado Cash in 2022, and the legal fight has been long and ugly. Using a sanctioned protocol can be a crime even if the math is elegant.
- Exchanges treat mixer-touched coins as a compliance event. Deposits can be frozen. That is the Travel Rule world meeting privacy tech.
Risks and Common Mistakes
- Thinking a mixer is a privacy coin. It is a service or a contract with a user base, a reputation, and often a prosecutor.
- Mixing dirty funds. If the input is proceeds of a crime, the output is still proceeds of a crime, now with an extra charge on top.
- Following a YouTube "how to cash out clean." That video is exhibit A.
When It Matters
Understanding why some deposits get flagged, and why I am not going to help anyone hide a trail. Address hygiene and not reusing hot wallets is the legal, boring privacy that actually helps normal people. See CoinJoin for Bitcoin's related, also-fraught cousin, and the regulator guide for who cares.
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