Why Section 604 of the BRCA Is the Decisive Factor for Crypto Market Structure Legislation

The debate over stablecoin yields has dominated headlines, but the real battleground for U.S. crypto legislation lies elsewhere. While bank lobbyists and media focus on who profits from Treasury bill reserves, Congress is on the verge of gutting a provision that could determine whether the crypto industry thrives or collapses under regulatory overreach.

That provision is Section 604 of the Blockchain Regulatory Certainty Act (BRCA), a narrowly tailored but essential component of the Senate’s market structure bill. It clarifies that software developers and infrastructure providers who do not custody or control user funds are not considered money transmitters under federal law.

Without Section 604, developers of non-custodial software—including wallets, protocols, and decentralized applications—face the threat of criminal prosecution under Section 1960 of the federal criminal code. This isn’t a hypothetical risk. In 2025, developers behind Tornado Cash and Samourai Wallet were criminally prosecuted not for laundering money themselves, but for publishing code that others used in ways the government disapproved of. Two developers, Keonne Rodriguez and William Lonergan Hill, are now serving federal sentences as a result.

The BRCA: A Bipartisan Safeguard at Risk

The BRCA, introduced by Senators Cynthia Lummis (R-Wyoming) and Ron Wyden (D-Oregon), is a bipartisan effort to prevent regulatory overreach. Its sole purpose is to prevent developers from being treated as money transmitters simply for writing and publishing software. This distinction is critical because:

• It does not weaken anti-money laundering (AML) statutes or shield bad actors.
• It ensures that innovation in decentralized finance (DeFi) and self-custody tools remains possible.
• It protects the foundational principle that publishing code is not the same as transmitting money.

Why Section 604 Is the Load-Bearing Wall of Crypto Legislation

The BRCA is not a technical footnote or an abstract debate—it is the load-bearing wall supporting the entire policy objective of the Senate’s market structure bill. If this provision is weakened or removed, the bill’s goals—promoting innovation, protecting consumers, and fostering a competitive crypto industry—will be impossible to achieve.

Yet, despite its importance, Section 604 is under threat. Senate negotiators, distracted by the stablecoin yield debate, are inching closer to gutting this provision. The consequences would be severe:

• Developers of non-custodial tools could face criminal liability for publishing software.
• Innovation in DeFi, self-custody, and decentralized applications would grind to a halt.
• The U.S. would cede leadership in crypto to jurisdictions with clearer regulatory frameworks.

The Stakes: Innovation vs. Overreach

The BRCA is not about protecting bad actors—it’s about preserving the freedom to innovate. Without it, the U.S. risks repeating the mistakes of the past, where ambiguous regulations led to regulation by prosecution. The cases of Tornado Cash and Samourai Wallet serve as a warning: if developers cannot publish code without fear of criminal liability, the entire crypto ecosystem will suffer.

As Congress finalizes the market structure bill, the fate of Section 604 will determine whether the U.S. can foster a thriving, competitive, and innovative crypto industry—or whether it will drive developers and innovation overseas.