The U.S. Marshals agency has announced plans to auction $4.3 million worth of bitcoin (BTC) in November 2018. The sealed bid auction is for nearly 660 bitcoins which were seized in a series of federal criminal, administrative and civil cases over the years.

The haul comes from cases against convicts like Thomas Mario Costanzo and Theresa Tetley , both sentenced to jail in 2018 on money-laundering charges. At the time, the agency seized 80 BTC from Costanzo and 40 BTC from Tetley. The U.S. Marshals, however, didn't reveal how much of the forfeited assets from the two would be sold next month.

Founded in 1789, the U.S. Marshals Service is a federal law-enforcement agency within the U.S. Department of Justice and the enforcement arm of federal courts.

Starting next month, bidders will be able to participate in the auction, which consists of two series: Series A and Series B, according to the agency. Series A consists of six blocks of 100 bitcoins each, while Series B has just one block with 60 bitcoins. Participating bidders will not be able to view other bids or modify their bid, once submitted, the agency warned.

To be part of the auction, a potential bidder needs to register with the agency on or before October 31, 2018.

The registration process includes a signed copy of the Bidder Registration Form, copy of government-issued photo ID of the bidder, a $200,000 deposit (about 30 BTC) sent by Electronic Funds Transfer ( EFT ) from a bank within the U.S. and a copy of the EFT receipt.

This is the third major Bitcoin auction by the U.S. Marshals this year, and it might not be the last. In January 2018, the agency sold 3,600 BTC, and it followed it up with the sale of 2,170 BTC in March. Its biggest bitcoin sale to date was in 2013, when Silk Road was shut down and Ross Ulbricht was sentenced to life imprisonment. The agency seized 144,341 BTC from Ulbricht and 29,656 BTC from Silk Road's servers, which it sold for around $48 million in the following years.

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The views and opinions expressed herein are the views and opinions of the author and do not necessarily reflect those of Nasdaq, Inc.