U.S. authorities close the Helix case and seize $400M in crypto assets

Key points:

• U.S. authorities have confiscated more than $400 million linked to the crypto mixer Helix, which was used to launder funds on the darknet.
• The court found that the service was created specifically as part of a criminal infrastructure and operated without complying with financial regulations.

U.S. authorities have completed the seizure of more than $400 million in crypto assets tied to Helix, a darknet mixer used to launder proceeds from illegal online marketplaces. Ownership of the assets transferred to the government following a final federal court ruling issued on January 21.

Helix began operating in 2014 and processed nearly 354,500 BTC over several years. At the time, those transactions were valued at roughly $311 million. According to the U.S. Department of Justice, most of the funds either originated from or were sent to darknet markets, while the operator earned transaction fees from the service.

Helix as Part of a Criminal Infrastructure

Crypto mixers like Helix are designed to obscure the origin of funds by pooling and redistributing transactions, making them harder to trace on the blockchain. In Helix’s case, authorities argue the service was not built to protect privacy, but was intentionally designed to launder money.

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The platform’s operator, Larry Dean Harmon, also launched the Grams search engine, which was directly integrated with major darknet marketplaces. Investigators estimate that Harmon earned tens of millions of dollars in commissions.

Experts say the shutdown of Helix dealt a serious blow to established money-laundering infrastructure. According to TRM Labs, such actions force illicit actors to rely on more complex and risky methods, increasing their exposure to law enforcement.

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The civil case against Harmon was based on violations of the Bank Secrecy Act. Investigators found that from 2014 to 2017, Helix operated as an unregistered money services business, without AML controls or reporting to FinCEN. In total, the service processed more than 1.2 million transactions.

Harmon later became CEO of Coin Ninja, a registered financial services company that also offered crypto products and promoted tools positioned as a way to bypass KYC requirements. In 2019, he was criminally charged and in 2021 pleaded guilty to conspiracy to commit money laundering. A civil penalty imposed by FinCEN in 2020 remains unpaid.