A German citizen accused of defrauding investors out of USD 4 billion by selling a fake cryptocurrency called OneCoin has been added to the FBI’s list of its ten most-wanted fugitives, US officials said on Thursday, writes CNN.

Ruja Ignatova, also known as “Cryptoqueen”, was charged in 2019 with eight counts including wire fraud and securities fraud for running the Bulgaria-based OneCoin Ltd as a pyramid scheme. Prosecutors say the company offered commissions for members to entice others to buy a worthless cryptocurrency.

“She timed her scheme perfectly, capitalizing on the frenzied speculation of the early days of cryptocurrency”, - said Damian Williams, the top federal prosecutor in Manhattan.

Williams described OneCoin as “one of the largest Ponzi schemes in history”.

Ignatova disappeared in late 2017 after bugging an apartment belonging to her American boyfriend and learning he was cooperating with an FBI probe into OneCoin, Williams said. She boarded a flight from Bulgaria to Greece and has not been seen since, he said.

The FBI is offering a USD 100,000 reward for information leading to Ignatova’s capture, said Michael Driscoll, the FBI’s assistant director-in-charge in New York.