Between 2014 and 2017, the Oxford-educated founder of OneCoin promised investors a revolutionary cryptocurrency that would surpass Bitcoin. Instead, it became one of the biggest scams in history - defrauding people of over $15 billion.In October 2017, Ignatova boarded a flight from Sofia to Athens and disappeared without a trace. Despite international investigations and an active FBI Most Wanted listing, no one has seen her since.!