# Coldcard Entropy Failure and Bitcoin Security Risks How a hardware wallet vulnerability is putting Bitcoin assets at risk - **Source:** [Bitcoin Audible](https://brifing.si/source/9d46a487-fc52-44f1-800d-adb267943891) - **Published:** 2026-08-04 - **Topic:** [Finance](https://brifing.si/c/finance) - **Original article:** - **On Brifing:** https://brifing.si/s/de44dbb6-2b3c-4c46-b8ef-54987e2b4cce ## Coldcard's Entropy Disaster A flaw in the random number generation of Coldcard, a trusted hardware wallet, made Bitcoin keys predictable. Keys that should have 256-bit entropy became vulnerable to brute-force attacks within minutes due to weak generation algorithms. This issue has endangered funds of thousands of users. ## AI Expanding the Attack Surface Artificial intelligence technologies are exponentially increasing the speed and efficiency of brute-force attacks. Key derivation processes that would take months with traditional methods can now be completed in minutes with AI optimization. Wallets with weak entropy are particularly vulnerable to these attacks. ## Open Source vs Source-Available Software The Coldcard incident highlights the critical difference between 'source-available' and true open-source software. Visible source code doesn't guarantee independent audits. Security experts are questioning the transparency levels of hardware wallet manufacturers. ## Shortcomings in Hardware Security Testing The entropy generation flaw in Coldcard suggests possible oversights in comprehensive security testing. Experts advocate for independent certification of critical functions like random number generation in hardware wallets by third-party organizations. ## Dice Rolling for Key Generation Physical dice rolling emerges as an effective alternative against software entropy flaws. This analog method guarantees true randomness. Users can manually record dice results and derive Bitcoin keys through mathematical operations. ## Multi-Sig as a Saving Solution Multi-signature wallets provide protection against single-device vulnerabilities. Requiring approval from multiple devices to access funds prevents total asset loss from one device's security weakness. Experts actively recommend this method. ## Corporate Influence and Core Developer Funding Corporate investments in Bitcoin ecosystem are affecting funding sources for core protocol developers. Some critics argue this could threaten Bitcoin's decentralized nature. Transparent funding models are being debated within the community. ## Anti-Fragile Security Approach The Coldcard case emphasized the importance of anti-fragility principles in Bitcoin self-custody security. A combination of multi-layered security, independent audits, and user education is needed to make systems stronger from failures. ## Sources covering this story - https://bitcoinaudible.com/roundtable_023-staying-humble/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._