2026-08-05 · ledger
Ledger responded to the Coldcard Mk3 advisory with a focused explanation of what went wrong and why entropy quality is foundational to wallet safety. The post centers on a firmware bug that reportedly weakened seed generation and contributed to user losses. This is exactly the kind of event that justifies cold storage discipline. If seed creation is flawed at the source, every later security measure becomes less meaningful because the wallet may already be predictable to an attacker.
Ledger says the Coldcard incident exposed how a firmware bug weakened randomness during seed phrase generation, making wallet creation less secure than users expected. The post connects that failure to earlier industry examples where poor entropy made supposedly private wallets recoverable from public information.
When seed generation fails, losses can be absolute because the attacker is not breaking in after the fact; they may be able to derive the keys from the start. That means funds, backup assumptions, and inheritance plans can all collapse at once, especially if users believe a compromised hot setup is still trustworthy.
Cold storage does not fix bad entropy by itself, but it forces owners to think carefully about how keys are generated, backed up, and isolated before funds are exposed online. Using well-audited hardware, offline seed handling, and physically separated backups sharply reduces the chance that a single software flaw wipes out both access and recoverability.
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