OneCoin was a Bulgarian ponzi scheme in which investors bought packages of "tokens" with which they would supposedly "mine" cryptocurrency. Despite advertising as a decentralized cryptocurrency, OneCoin in reality was centralized on the company's servers. The scheme attracted around $4 billion in investments since its creation in 2014, and several people associated with the project have pled guilty to money laundering and fraud charges.
"Cryptoqueen" Ruja Ignatova added to Europol's most wanted list in connection to OneCoin ponzi scheme
Ruja Ignatova, also known as the "Cryptoqueen", is a serial fraudster who has been on the run since 2017. In 2019, she was charged in absentia by U.S. authorities due to her connection with the OneCoin ponzi scheme.