OneCoin
OneCoin was a fraudulent investment scheme masquerading as a cryptocurrency, launched in 2014 by Bulgarian national Ruja Ignatova and British marketer Karl Sebastian Greenwood, which promised high returns through a purported blockchain-based digital currency but operated without any underlying blockchain technology or transferable coins.[1][2]
The operation relied on multi-level marketing recruitment, where participants purchased educational packages and "OneCoins" that held no real value, defrauding over 3 million investors worldwide of approximately $4 billion before collapsing amid regulatory scrutiny.[3]
Ignatova, dubbed the "Cryptoqueen," disappeared from public view in October 2017 shortly before U.S. authorities filed charges, and she remains at large as one of the FBI's Ten Most Wanted fugitives with a $5 million reward for information leading to her arrest.[4]
Several key figures, including Greenwood who received a 20-year prison sentence in 2023 for wire fraud and money laundering, have been convicted in U.S. federal courts, highlighting the scheme's structure as a classic pyramid operation dependent on new investor funds rather than genuine economic activity.[3]