Dec. 12 (UPI) -- A federal judge in New York sentenced Do Kwon, the former CEO of blockchain and cryptocurrency company Terraform Labs, to 15 years in prison for a scheme that cost victims billions of dollars.

The 34-year-old South Korean native received a higher sentence than defense lawyers and even prosecutors sought -- five years and 12 years, respectively, The New York Times reported. Prosecutors agreed to let Kwon serve the second half of his sentence in South Korea.

U.S. District Judge Paul A. Engelmayer for the Southern District of New York said he went with the 15-year sentence because Kwon's crimes represented "fraud on an epic, generational scale." He also ordered Kwon to pay more than $19 million in proceeds from the scheme.

The judgment was handed down in court Thursday, some four months after Kwon pleaded guilty to one count of conspiring to commit commodities fraud, securities fraud and wire fraud as well as one count of committing wire fraud. Authorities arrested Kwon in Montenegro after he led them on an 18-month manhunt, The Guardian reported.

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