Mistrial Declared in Ethereum MEV Exploit Case: Brothers Accused of Fraud & Money Laundering

Case Overview

A New York jury was unable to reach a verdict in the case of Anton and James Peraire-Bueno, MIT-educated brothers accused of fraud and money laundering related to a 2023 exploit of the Ethereum blockchain, which resulted in the removal of $25 million in digital assets. In a ruling on Friday, US District Judge Jessica Clarke declared a mistrial after jurors failed to agree on whether to convict or acquit the brothers, as reported by Inner City Press. This decision followed a three-week trial in Manhattan federal court, where prosecutors and the defense presented differing perspectives on the Peraire-Buenos’ alleged actions involving maximal extractable value (MEV) bots.

What is an MEV Attack?

An MEV attack occurs when traders or validators exploit transaction ordering on a blockchain to generate profit. Automated MEV bots are used to front-run or sandwich other trades by paying higher fees for priority. In the brothers’ case, they allegedly utilized MEV bots to "trick" users into trades. Despite months of planning, the exploit reportedly took only 12 seconds to net the pair $25 million.

Arguments from Prosecution and Defense

During closing arguments this week, prosecutors asserted that the brothers “tricked” and “defrauded” users through a “bait and switch” scheme, extracting approximately $25 million in crypto. They presented evidence suggesting that the two planned their actions for months and researched potential consequences. “Ladies and gentlemen, bait and switch is not a trading strategy,” prosecutors stated on Tuesday, according to Inner City Press. “It is fraud. It is cheating. It is rigging the system. They pretended to be a legitimate MEV-Boost validator.” In contrast, the defense argued that the Peraire-Buenos did not pretend to be "honest validators" to extract the funds, although the court ultimately allowed this argument to be presented to the jury. “This is like stealing a base in baseball,” the defense team stated on Tuesday. “If there’s no fraud, there’s no conspiracy, there’s no money laundering.”

What's at Stake for the Crypto Industry?

While the case concluded without a verdict, the mistrial has divided the crypto industry, with many debating the legal and technical implications of treating MEV-related activity as a potential criminal offense. Coin Center, a crypto advocacy organization, filed an amicus brief on Monday following opposition from prosecutors. “I don’t think what’s in the indictment constitutes wire fraud,” said Carl Volz, a partner at law firm Gunnercooke, in a Monday op-ed for DLNews. “A jury could conclude differently, but if it does, it’ll be because the brothers Googled stupidly and talked too much, for too long, with the wrong people.” This is an evolving story, and further information will be added as it becomes available.