He is the man at the centre of one of the biggest bankruptcy scandals involving Bitcoin. In 2015, CEO Mark Karpeles was arrested by Japanese authorities on charges of embezzlement and aggravated breach of trust. He was eventually acquitted on most of the charges and handed a suspended sentence for falsifying data.

What do we know today about how the Japanese exchange was hacked, and where the missing Bitcoin could be today? How has the process of restitution for victims' monies progressed? What was the personal cost of the bankruptcy scandal? How does Karpeles view what happened with FTX? Michelle Martin finds out, in conversation with Mark Karpeles.