Ethereum has renewed attention on the legal battle involving Tornado Cash developer Alex Pertsev, placing the wider question of software developer liability back at the center of the crypto privacy debate.
In a thread published , Ethereum said Pertsev was still fighting for his freedom and highlighted his case in the Netherlands. The comments arrived as he prepared to speak at Dutch Blockchain Week in Amsterdam about whether creators of decentralized software should be held responsible for criminal activity carried out by users.
Dutch Blockchain Week listed Pertsev among its 2026 speakers, with the summit held in Amsterdam on June 24 and 25.
His scheduled appearance centered on a legal issue affecting open-source software, decentralized finance, and privacy technology: whether developers can face criminal responsibility after releasing neutral software that others later use for unlawful purposes.
Pertsev helped develop Tornado Cash, an Ethereum-based privacy protocol launched in 2019. Its smart contracts allow users to deposit digital assets and withdraw them through different addresses, making the direct transaction trail more difficult to follow.
Supporters describe the protocol as a financial privacy tool. Investigators have also linked portions of its activity to stolen funds and criminal organizations.
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A Dutch court convicted Pertsev of money laundering in May 2024 and sentenced him to five years and four months in prison.
Judges found that Tornado Cash had been designed to perform actions needed to conceal the origin, ownership, and movement of cryptocurrency. The ruling said Pertsev and the other developers accepted the substantial risk that illegally obtained assets would pass through the protocol.
His legal team has challenged that reasoning. The appeal centers partly on the decentralized and immutable nature of Tornado Cash, including whether Pertsev retained meaningful control over the software after its deployment.
Pertsev was conditionally released from detention in February 2025 while preparing the appeal. The release included electronic monitoring and restrictions on his movements, leaving him unable to travel outside the Netherlands.
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Ethereum’s thread described Tornado Cash as neutral, open-source, and immutable software. It also pointed to legitimate privacy uses, including donations, personal transfers, and efforts to prevent counterparties from viewing a user’s full financial history.
(adsbygoogle = window.adsbygoogle || []).push({});However, the Dutch ruling focused on the protocol’s handling of illicit funds and the developers’ knowledge of criminal usage.
That difference forms the core dispute. One side treats the software as a general-purpose privacy system whose developers cannot control every user. Prosecutors and the trial court instead placed weight on its design, known criminal activity, and the absence of mechanisms that could stop suspicious transactions.
The appeal could therefore influence how European courts treat developers of decentralized applications. Pertsev’s appearance in Amsterdam brings that question beyond the courtroom, while his conviction remains in force during the continuing legal process.
