In a pivotal development in the ongoing legal proceedings against Samourai Wallet, the defense team for co-founders Keonne Rodriguez and William Hill has filed a motion to dismiss the case, asserting that federal prosecutors from the Southern District of New York (SDNY) suppressed critical exculpatory evidence. Central to this claim is guidance from the Financial Crimes Enforcement Network (FinCEN), which purportedly indicated that Samourai Wallet did not meet the criteria of a money transmitting business under existing regulations.

Background of the Case

Rodriguez and Hill were arrested in April 2024 on charges including conspiracy to commit money laundering and operating an unlicensed money transmitting business. The Department of Justice (DOJ) alleges that Samourai Wallet facilitated over $2 billion in unlawful transactions, with more than $100 million linked directly to money laundering activities through dark web markets such as Silk Road and Hydra Market . The DOJ contends that the wallet's features, including its Whirlpool mixing service and Ricochet transactions, were designed to obfuscate the origin of funds, thereby aiding illicit activities.

Defense's Argument and FinCEN's Role

The defense's motion centers on the assertion that prosecutors failed to disclose FinCEN's prior determination that Samourai Wallet, as a non-custodial service, did not qualify as a money transmitter. This omission, the defense argues, constitutes a violation of the Brady rule, which mandates that the prosecution disclose all exculpatory evidence to the defense. The defense maintains that Samourai Wallet merely provided software tools for users to manage their own cryptocurrency, without taking custody of user funds or executing transactions on their behalf.

Legal and Regulatory Implications

The case has broader implications for the cryptocurrency industry, particularly concerning the classification of non-custodial wallet providers under U.S. law. Historically, FinCEN has distinguished between custodial services, which hold and transmit funds on behalf of users, and non-custodial services, which do not have control over user funds. The DOJ's current stance appears to challenge this distinction, potentially setting a precedent that could subject developers of similar non-custodial tools to regulatory requirements and criminal liability.

Political and Industry Response

The DOJ's approach has drawn criticism from various quarters, including U.S. lawmakers. In May 2024, Senators Ron Wyden and Cynthia Lummis sent a letter to Attorney General Merrick Garland, expressing concern over what they described as an "unprecedented interpretation" of the law. They argued that treating developers of non-custodial software as money transmitters could have chilling effects on innovation and raise constitutional issues related to free speech.

Next Steps

The trial for Rodriguez and Hill is scheduled to commence on November 3, 2025 . The court's decision on the motion to dismiss will likely hinge on the interpretation of FinCEN's guidance and the applicability of the Brady rule. The outcome could have significant ramifications for the regulatory landscape of cryptocurrency services and the development of privacy-focused tools within the industry.