Web3 & Crypto Security9 August 2026
How a 2021 RNG Bug Turned Coldcard's 'Offline' Wallets Into a $130M Heist
A firmware error from March 2021 quietly swapped Coldcard's hardware random number generator for a predictable software fallback, letting at least a dozen threat actors brute-force seed phrases and drain over $130M in Bitcoin.
hardware-walletsbitcoinentropy
5 min readRead
Hardware Wallet Security2 August 2026
Coldcard's 2021 Firmware Bug Drains $89M in Bitcoin — A Five-Year Blind Spot
A silent 2021 configuration error swapped Coldcard's hardware RNG for a predictable software fallback, and five years later attackers used it to drain more than $89 million in Bitcoin.
bitcoinhardware-walletsrng
4 min readRead