Two days ago, a friend who invested in Bitcoin asked me how secure her Coinbase investment was. She had plans to put her coins in cold storage but as a security stopgap was relying on two-factor authentication (2FA) through Coinbase, as many people do. My main question: What kind of two-factor? The problem with 2FA is that often a distinction isn’t made between SMS-based 2FA, which sends… Read More...