U.S. prosecutors have appealed the “time served” sentences given to the co-founders of HashFlare, a fraudulent crypto mining service tied to a $577 million Ponzi scheme.
In a filing to a Seattle federal court on Tuesday, prosecutors challenged the sentences handed down earlier this month to Sergei Potapenko and Ivan Turõgin.
The two men, arrested in Estonia in October 2022 and held there for 16 months before being extradited to the U.S. in May 2024, pleaded guilty to conspiracy to commit wire fraud.
Prosecutors had pushed for 10-year prison terms, arguing the HashFlare scheme inflicted severe financial harm on victims and represented the most significant fraud case the court had ever seen. Defense lawyers, however, urged for time served.
On August 12, Judge Robert Lasnik sentenced Potapenko and Turõgin to time served, imposed a $25,000 fine, and ordered them to complete 360 hours of community service while under supervised release, which will likely be served in Estonia.
Blockchain crime investigators and industry firms have pointed to weak penalties and abandoned enforcement actions as major factors fueling crypto-related crime, citing a widespread perception that offenders face little to no real consequences.
HashFlare Founders Claim Victims Have Been Repaid
According to prosecutors, HashFlare generated more than $577 million in sales between 2015 and 2019, while its co-founders fabricated dashboards that misrepresented the company’s mining capacity and investors’ earnings.
The government said payouts to existing members were funded by deposits from new customers, calling it “a classic Ponzi scheme.”
Attorneys for Potapenko and Turõgin contended that, although HashFlare exaggerated its mining capacity, customers ultimately gained crypto worth significantly more than their initial investments due to the surge in market prices after the scheme ended.
They further claimed that victims would be fully repaid from over $400 million in assets forfeited under the pair’s February plea deal. Prosecutors, however, argued that the underlying data was falsified and that these claims were misleading.
Sleuths Warn of Weak Accountability for Bad Actors
In June, blockchain investigators ZachXBT and Taylor Monahan warned that abandoned U.S. regulatory cases and a perception that scammers face minimal consequences are driving the rise in crypto crime.
Experts told last month that regulators, once criticized for overreach with aggressive early crackdowns, have now shifted toward underreaction, creating an environment with limited accountability.
Crypto crime losses hit a new all-time high in the first half of 2025, surpassing the previous record from 2022 and nearly matching the total losses for all of 2024.
Other Ponzi Scheme Operators Have Faced Jail Time
Former rugby player Shane Donovan Moore was sentenced in July to two and a half years in prison for defrauding over 40 investors of $900,000 in a crypto mining Ponzi scheme.
In a separate case, Dwayne Golden was convicted of wire fraud and money laundering and received an eight-year prison sentence in June for his involvement in a $40 million crypto Ponzi scheme run through three digital asset companies: EmpowerCoin, ECoinPlus, and Jet-Coin.
