Coldcard entropy flaw shakes confidence in hardware wallets — what it means for Ledger and Trezor

The discovery of an entropy flaw in the Coldcard hardware wallet has triggered a crisis of confidence across the hardware wallet industry. Experts are now examining whether similar vulnerabilities affect rivals Ledger, Trezor and Foundation before users entrust them with their Bitcoin. The flaw has prompted urgent calls for users to review the security of their devices.