In a Twitter thread, Coinbase CEO Brian Armstrong spells out his company's best guess on the QuadrigaCX debacle. According to blockchain analytics and internal research, it is possible QuadrigaCX had been running a fractional system for sometime, most likely caused by a June 2017 bug that cost millions and poor attempts to fix the situation. The mismanagement of funds was covered for quite a while, until the bear market hit and liquidity dried up. The death of CEO Gerald Cotten could be a scapegoat for the insolvent exchange: his December death fails to line up with mid-2018 customer complaints about delayed withdrawals.