BBC Sounds' new podcast, The Missing Cryptoqueen, investigates a cryptocurrency scam and a billion-pound international fraud case. The podcast tells the story of Ruja Ignatova, the founder of OneCoin, who disappeared in 2017. In March 2019, she was accused of money laundering, wire transfers and securities fraud in the United States, and the US Department of Justice called OneCoin an old-fashioned pyramid scheme. Konstantin Ignatov took over OneCoin after she disappeared. He was arrested in March 2019 for conspiring to commit telecommunication fraud and is expected to be tried in the United States. According to data obtained by the BBC, the scam is worth between £3.6 billion and £4 billion worldwide. The victims are from 175 countries, which is probably the biggest encryption scam ever, and it continues to this day.