Ethereum Dev Defends Tornado Cash as Privacy Tool Amid Roman Storm Trial
Ethereum developer Preston Van Loon testifies in Tornado Cash trial, calling it a privacy tool amid accusations of aiding money laundering.
The high-profile criminal trial of Tornado Cash co-founder Roman Storm took a pivotal turn as Ethereum core developer Preston Van Loon testified in Storm’s defense, describing the crypto mixer as a necessary privacy solution rather than a vehicle for criminal enterprise.
Speaking before the U.S. District Court for the Southern District of New York, Van Loon emphasized the tool’s legitimate use within decentralized finance (DeFi), highlighting the risks users face without sufficient privacy protections. “If attackers know the extent of my assets, I could be a target,” he stated, reinforcing the idea that Tornado Cash serves a protective function for users.
Van Loon confirmed he personally used Tornado Cash to transfer 43 ETH in 2019 and 2020, underscoring the tool’s utility in protecting personal finances from potential threats. His testimony aims to reframe the mixer not as a laundering mechanism, but as a standard privacy layer in Ethereum's open ecosystem.
Roman Storm is facing charges related to facilitating money laundering through Tornado Cash, with U.S. prosecutors presenting evidence tying the platform to illicit transactions, including those involving North Korea’s Lazarus Group. However, Storm’s legal team argues the platform’s smart contracts are neutral technologies, with no centralized control or malicious intent.
To bolster this argument, the defense is preparing additional expert testimonies from blockchain analytics firms such as Chainalysis, and possibly medical professionals, to contextualize Tornado Cash’s design and use cases. They have also requested that jury instructions be modified to better explain how decentralized protocols function, in hopes of mitigating misconceptions about the platform’s intent and architecture.
The case stands at the intersection of privacy rights and regulatory enforcement in blockchain ecosystems. Tornado Cash was sanctioned in 2022 by the U.S. Treasury Department, a decision that set precedent for the treatment of smart contracts under U.S. law. Critics argue such actions threaten open-source development and privacy innovation.
If convicted, Storm could face a lengthy prison sentence, similar to other landmark crypto prosecutions such as Sam Bankman-Fried’s 25-year term or Alexey Pertsev’s five-year sentence in the Netherlands.
Beyond the courtroom, the trial is being closely watched by developers, regulators, and privacy advocates alike. The verdict could shape the future of crypto privacy tools and define the legal boundaries of decentralized finance.
