Tornado Cash was a decentralized mixing protocol on Ethereum that allowed users to deposit and withdraw ETH or tokens without a traceable link between the two addresses. On August 8, 2022, the US Treasury’s Office of Foreign Assets Control (OFAC) sanctioned Tornado Cash — the first time a government sanctioned a software protocol rather than a person or entity.
The sanctions had immediate consequences. Circle froze $75,000 in USDC held in Tornado Cash contracts. GitHub deleted the Tornado Cash repository. Infura and Alchemy blocked RPC access to the contracts. The Tornado Cash DAO’s TORN token plummeted. Within days, the protocol was effectively deplatformed from centralized infrastructure.
Two weeks later, Dutch authorities arrested Alexey Pertsev, one of Tornado Cash’s developers, charging him with money laundering. Pertsev’s arrest sent shockwaves through the developer community — if writing open-source code could lead to criminal charges, what did that mean for every DeFi developer?
In May 2024, Pertsev was convicted in the Netherlands and sentenced to 64 months in prison. The verdict established a precedent that developers can be held criminally responsible for how others use their code, fundamentally challenging the “code is speech” principle that crypto developers had long relied on.
Meanwhile, Roman Storm, another Tornado Cash developer arrested in the US, faced federal money laundering and sanctions violation charges. His case, still proceeding through courts in 2024-2025, became a rallying point for crypto privacy advocates, with Coinbase and other companies funding his legal defense.
The sanctions themselves were legally challenged. In November 2024, the US Fifth Circuit Court of Appeals ruled that OFAC exceeded its authority by sanctioning immutable smart contracts — finding that autonomous code is not “property” of a foreign national that can be sanctioned. This ruling potentially limited the government’s ability to sanction decentralized protocols.
Tornado Cash became crypto’s most important legal battleground. The cases against its developers will define the legal status of open-source DeFi development, the limits of financial surveillance, and whether privacy is a right or a crime in the age of transparent blockchains.
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