Tesla uses blockchain for supply chains and a new hack can whisper to your phone. It's CoinDesk's Markets Daily.Today's Stories:Bitcoin Tracks Stocks Up to $7.4K Before Sliding Back to $7.1KBitcoin Cash Undergoes 'Halving' Event, Casting Shadow on Miner ProfitabilityTesla Completes Blockchain Pilot to Speed China Imports ProcessA New Ultrasonic Hack Can Exploit Your SiriSee Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.