 Monday to Friday, we focus on one story in detail with the help of the BBC's best journalists. She went from self-styled queen of cryptocurrency to one of the most wanted women on the planet. As we've alleged, Ignatova founded and ran one of the largest Ponzi schemes in history, peddling a fake cryptocurrency called OneCoin and raking in billions of dollars. Dr Ruzsa, as she became known, scammed investors all over the world, and then she vanished.