2026-08-03 · tangem
Tangem published a security-focused analysis of poor entropy in crypto wallets, using a recent hardware-wallet incident and prior nonce failures to show how weak randomness can still lead to catastrophic asset loss. The post argues that many of the biggest losses in crypto have come from flawed key generation rather than exotic attacks. That is exactly the kind of signal cold-storage users should pay attention to. Moving assets offline helps, but it only provides real protection when the device generates keys correctly, isolates them properly, and supports resilient recovery if the primary wallet or environment fails.
Tangem detailed how weak or mishandled entropy can undermine wallet security, citing a July 31 attack wave that emptied hundreds of Bitcoin wallets after flawed seed generation. The article also connects the issue to earlier predictable-nonce failures and explains why secure elements and certified hardware random number generators matter.
When a private key is predictable or recoverable, the loss is immediate and usually irreversible because the attacker does not need to breach an exchange or centralized custodian. In crypto custody, one entropy failure can collapse every other safeguard, leaving the owner with no rollback, no fraud desk, and no practical recovery path.
Cold storage reduces exposure by keeping keys off permanently connected systems, but Tangem’s warning makes clear that offline alone is not enough. The safer pattern is hardware-backed key generation, isolated signing, and separate offline recovery materials so that both compromise risk and recovery risk are addressed together.
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