Coldcard Deploys Major Firmware Upgrade Following Seed Attack
Coldcard has released a firmware upgrade after a seed-generation flaw exposed some customers to theft. The company urges Mk4, Mk5, and Q users to install firmware 5.6.1. The update changes how devices create, protect, and validate wallet data. Significantly, Coldcard now requires users to add randomness during seed creation.
Users can press keys, roll dice, or flip coins. The device combines that input with hardware entropy and cryptographic protections. However, the company warns that the upgrade cannot protect seeds created through the vulnerable process.
Stronger Checks Protect Wallet Operations
Besides seed generation, the release adds safeguards around transactions and USB connections. The device now performs a PSBT check immediately before signing. Consequently, users receive a warning when a computer changes transaction details after approval.
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