There was this recent case showing how not to do this feature. https://medium.com/@CodyBrown/how-to-lose-8k-worth-of-bitcoin-in-15-minutes-with-verizon-and-coin

There was this recent case showing how not to do this feature. https://medium.com/@CodyBrown/how-to-lose-8k-worth-of-bitcoin-in-15-minutes-with-verizon-and-coinbase-com-ba75fb8d0bac https://medium.com/@CodyBrown/how-to-lose-8k-worth-of-bitcoi...