Mark Karpeles: "All I Had Was a Simple Calculator!"

The former MT. Gox CEO shared a remarkable story. After his 2015 arrest, he faced a daunting task: sifting through 20,000 pages of evidence using just a basic accounting calculator he bought for $120 from the prison commissary.

"I'd spend the next couple of months going through the accounting information provided by the prosecution, and managed to find some 5.5 million USD worth of revenue that wasn't accounted for. Suddenly, the argument raised by the prosecution didn't make sense," commented Mark Karpeles.

This simple calculator changed the game. After nearly a year in custody, he was granted bail and, two years later, fully cleared of charges.