OneCoin is a fraudulent cryptocurrency scheme conducted by offshore companies OneCoin Ltd, based in Bulgaria and registered in Dubai, and OneLife Network Ltd, both founded by Ruja Ignatova in concert with Sebastian Greenwood. OneCoin is considered a Ponzi scheme due to its organisational structure of paying early investors using money obtained from newer ones. It was also a pyramid scheme due to the recruiting of investors without providing any actual product. The company secretly conducted database entry scam simulating transactions not registered by an actual blockchain, and with no mining behind the apparent cryptocurrency release and circulation. Many of those characters central to OneCoin had been previously involved in similar and different other schemes and business malpractices separate from each other. OneCoin was described by
The Times as "one of the biggest scams in history".