Fake crypto OneCoin's Co-founder Sebastian Karl Greenwood has been sentenced to 20 years in prison for defrauding 3.5 million people of $4 billion. Officials said OneCoin, founded by Greenwood and Ruja Ignatova (known as 'Cryptoqueen'), was a global pyramid scheme that convinced investors it was the next "can't miss" investment opportunity. "In reality, OneCoin had no actual value," lawyers said.