Federal prosecutors in Manhattan were expected to announce the charges this afternoon.
Arthur Budovsky is the founder of Liberty Reserve, a currency system long favored by cybercrime scammers. He was arrested in Spain on Friday. There also were arrests in Costa Rica and New York.
Authorities say the network processed at least 55 million illegal transactions worldwide. They call the international money-laundering case the largest ever.
Concern had been building on underground Internet forums since Liberty Reserve, a currency system long favoured by scammers, went offline last week. In a statement, Costa Rica police confirmed that Budovsky had been arrested in Spain on money laundering charges and that several premises linked to his company had been raided.
Liberty Reserve's demise is likely to send a sharp shock across the Internet.
Aditya Sood, a computer science doctoral candidate at Michigan State University who has studied the underground economy, said called it one the most popular currencies for cybercriminals.
Liberty Reserve operates as a no-questions-asked alternative to the global banking system, with little more than a valid email needed to open an account and start moving money across borders.
"You don't need to provide your full details, or personal information, or things like that," Sood said in a telephone interview. "There's no way to trace an account. That's the beauty of the system."
Like other cybercurrencies, Liberty Reserve has many legitimate users, but the promise of untraceable transactions has long made it attractive to scammers.
Sood said that despite prominent disclaimers warning against money laundering, the way Liberty Reserve was set up meant that currency centers typically had little in the way of serious oversight.
"Cybercriminals don't provide their real credentials," Sood said, leaving brokers in the dark about who was sending what where.
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