U.S. and Estonian authorities are working to confiscate properties and bank accounts maintained by the defendants, Brown said.
Court records in Seattle did not indicate whether the men had obtained attorneys. Some of the victims were in Western Washington state, authorities said.
The cryptocurrency industry has seen a fair share of volatility and turmoil this year, including a sharp decline in price for bitcoin and other digital assets. Earlier this month, the third-largest cryptocurrency exchange, FTX, collapsed after experiencing the crypto equivalent of a bank run. For some, the events are reminiscent of the failures of Wall Street firms during the 2008 financial crisis, particularly now that supposedly healthy firms like FTX are failing.