**[Coldcard 2021 Firmware Vulnerability Leads to Over $100 Million in Bitcoin Theft]** Odaily Planet Daily reports that a 2021 firmware vulnerability in the hardware wallet Coldcard resulted in insufficient randomness in some recovery seeds. Since July 30, attackers have transferred approximately 1,600 to 1,800 bitcoins from affected wallets, involving thousands of addresses and valued at over $100 million. Coldcard manufacturer Coinkite stated that it must be assumed someone used AI to review its publicly available firmware. The vulnerability has existed for about five years, but whether AI was involved in the related attacks has not been confirmed. Shielded Labs researcher Taylor Hornby, using the Claude Opus 4.8 auditing agent, discovered a vulnerability in the Zcash Orchard shielded pool circuit that originated in 2022. During testing, it was possible to generate an unlimited amount of counterfeit ZEC without leaving traces. Developers fixed the issue within a few days, and no confirmed thefts have been reported. Blockchain analytics firm Chainalysis reported that the daily average of on-chain writes containing malicious software instructions and command-and-control information increased from approximately 2.06 times to 11.1 times, a 440% surge. (Bitcoin.com News)