Zack Shapiro warns prosecutors target non-custodial wallet coders

Federal prosecutors are turning open-source code into a criminal offense.

Legal expert Zack Shapiro warned on BTC Sessions on September 17, 2026, that the Department of Justice is quietly dismantling decade-old Financial Crimes Enforcement Network guidance. Historically, FinCEN clearly distinguished software authors from financial intermediaries who actually handle user money. Now, recent federal cases against developers of tools like Samourai Wallet and Tornado Cash treat coders who never touched customer funds as unlicensed money transmitters.

The legal shift creates an existential threat for open-source Bitcoin infrastructure. If courts adopt the prosecution’s theory, publishing or executing non-custodial code becomes grounds for criminal prosecution. Shapiro noted that government attorneys are stretching legal concepts to bizarre lengths in court filings, even comparing software tools to frying pans that transmit heat to bypass the strict custody requirement.

The downstream effect is immediate consolidation. Deprived of independent, self-custody software options, users will have no legal path to hold or move digital assets except through heavily regulated Wall Street intermediaries like BlackRock and Coinbase. Direct peer-to-peer usage would effectively be outlawed in the United States.

Defense efforts are shifting from courtroom arguments to Capitol Hill. Legal advocates are pushing for the Blockchain Regulatory Certainty Act, a bill designed to codify FinCEN's original distinction into binding federal law. Without statutory protections, non-technical federal judges handling high-profile money laundering trials will establish binding precedents that criminalize code creation across the board.

The threat extends beyond financial tools to the broader open-source ecosystem. Just as Foundation Devices moved on September 2, 2026, to isolate hardware keys from application code, developers are attempting to build technical walls against vulnerabilities. But technical architecture cannot protect developers if writing software itself is classified as money transmission.

Without statutory protection, code itself becomes the crime.