The Coldcard holders drained on 30 July had multiple safes, a safety deposit box and a device that never touched the internet, which is four defences against the same threat and none against the one that emptied them, a shape engineers call common cause failure
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Jonathan Goodman did what a careful person is supposed to do with a fortune in bitcoin. He generated his seed offline, on a Coldcard, and never typed it into anything connected to the internet. He split his backups across multiple safes and a safety deposit box. When the Coldcard entropy bug drained his wallet along with thousands of others on 30 July, he described his own setup plainly: “I never shared my seed phrase with anybody. My devices never touched the internet,” and “e
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