OneCoin’s co-founders, Bulgarian nationwide Ruja Ignatova and joint U.Okay. and Swedish citizen Karl Greenwood, promoted the fictional cryptocurrency – which by no means existed on any blockchain – by way of a form of multi-level advertising and marketing scheme, paying preliminary buyers to usher in extra buyers. By the point OneCoin was revealed to be a rip-off, an estimated 3.5 million folks had fallen sufferer.