Dr Ruja Ignatova, also known as the “crypto queen”, may ring a bell even for non bitcoin aficionados now that the FBI and Europol has named her among their 10 most-wanted fugitives. The reason? Ignatova is the founder of the cryptocurrency Ponzi scheme OneCoin, which has been dubbed one of the biggest scams in history. Ignatova, who claimed that OneCoin would rival bitcoin, allegedly led a massive fraud of more than US$4 billion, which has impacted hundreds of thousands of investors worldwide. In 2014, a woman named Ruja Ignatova launched a fake cryptocurrency named "OneCoin". Despite the currency never existing,...