500 Coldcard hardware wallets hacked, $40 million in Bitcoin stolen
About 4,000 bitcoins—worth roughly $40 million at the time—were stolen after 500 Coldcard hardware wallets were compromised, according to a news alert. Coldcard, an open-source Bitcoin cold-storage device widely considered trusted, was hit by a flaw that unexpectedly exposed users’ offline private keys. The stolen funds have been moved to an unknown address, and on-chain tracking is ongoing. The incident did not involve an exchange or custodial platform, prompting renewed scrutiny of hardware wallet firmware updates, physical side-channel protections, and seed-phrase backup procedures.