Samourai Sentences Cement DOJ’s Money Transmitter Theory for Crypto Mixers

Why It Matters

The sentencing sets a precedent that crypto mixers, even when non‑custodial, can be treated as money transmitters, signaling tougher enforcement for privacy‑focused blockchain services and prompting developers to consider fully decentralized designs to mitigate legal risk.

Summary

Co‑founders of the privacy‑focused Samourai Wallet, Keonne Rodriguez and William Lonergan Hill, were sentenced to four and five years in federal prison for operating an unlicensed money‑transmission business and facilitating illicit crypto transactions through the wallet’s Whirlpool CoinJoin mixer. The court ruled that, despite the service being non‑custodial, Samourai’s coordination of mixing transactions constituted money transmission under FinCEN rules, highlighting the DOJ’s stance that privacy tools can trigger AML licensing requirements. The case mirrors the Tornado Cash prosecution and underscores a legal trend that only fully decentralized protocols may avoid liability, while developers of privacy‑enhancing crypto services face heightened regulatory scrutiny.