is sin onynonymous with an underground economy. >> that's a silly thing to say. bitcoin has a paper trail for every transfer done. it's unknown the silk road guy was using bitcoin, not as well known there were two federal agents that were extorting money from him and other people in the dark web and it was a bitcoin company, bit stamp, that reported them to the authorities and they are both in prison, because every single crime they committed was a permanent paper trail. if the government had the choice today to approve either cash or bitcoin, no way they'd approve cash. cash is great for crimes. bitcoin is terrible. >> hey, vivek, i know you made reference, dan made reference to the technological control. technology worries you. in other words, you see the technological side of bitcoin as being problematic. quickly tell me why. >> mike, would you put your life savings into digital currency,