it's totally file is what cache david gerard doesn't buy all the height. he's one of the most outspoken critics and skeptics of block chain technology. it's not very good as a payment system. there's a small claimant use case. if you want to trading things, the government doesn't want to trade in that's david's polite way of saying illegal stuff. in 2011, most of my partner colleagues were saying 3 things. without the drugs pornography on the silk road was a black market on the dark weapon where buyers and sellers use bitcoin to fly under the radar of the authorities. it had 1000000 uses until the f b. i showed up and shut it down. they caught this guy for running it and confiscated the coins held in escrow by snatching his computer and then they locked him away for life. no doubt crypto currencies can be a tool for criminal activity, but so on dollar bills or the banking system. and let's not forget, the block chain is a public ledger. it's actually been quite useful for uncovering crimes, a former federal prosecutor named catherine hon. she was the one w