Bitkub Academy warns Coldcard users to move assets immediately after hackers steal nearly 89 million dollars in BTC

Digital FinanceRegulation Impact 4
โดย Money & Banking·Read original
Summary · why it matters

Bitkub Academy is warning users of the Coldcard hardware wallet to move their assets immediately, following a fourth wave of attacks between August 2 and 3, 2026, which pushed cumulative losses to around 1,367 BTC, or nearly 89 million US dollars, from approximately 4,585 wallet addresses. The incident began on July 30 to 31, 2026, when 594 BTC were swept from around 500 wallets in just 25 minutes. The root cause is a vulnerability in Coldcard's firmware that has been embedded since March 2021, where the device bypasses the hardware random number generator and uses predictable data instead, reducing security to roughly 40 bits. Initially, it was reported that only the Mk3 model running firmware versions 4.0.1 through 5.0.3 was affected, while Mk4, Mk5, and Q were not impacted. However, the latest information reveals that Mk3 wallets with a passphrase as short as two words have also been compromised, and Coinkite has admitted it cannot guarantee 100 percent security for other models, urging users to move their assets out. The company released a firmware fix on August 1. Other hardware wallet makers such as Ledger, Trezor, Bitkey, and Jade have confirmed they are not affected by this issue.

Impact on stocks 0

Theme Impact 2

Off-coverage companies 3

Ledger SASPrivate▲ Positive
Competitionrelevance

Ledger confirmed not affected, possibly benefiting from Coldcard's security breach.

TrezorPrivate▲ Positive
Competitionrelevance

Trezor confirmed not affected by the Coldcard vulnerability, potentially gaining user trust.

CoinkitePrivate± Mixed
relevance

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