ChainCatcher report: On Reddit, a developer used Claude Code to scan the Coldcard open-source firmware and identified the core vulnerability in just 8 minutes: The firmware used a software-based pseudo-random number generator instead of a hardware true random number generator when generating private keys—a flaw responsible for the theft of approximately $70 million in BTC across 1,196 wallets. Additionally, community users reported that they independently discovered the same vulnerability using Zhipu GLM 5.2 (trained on June 16, offline). This bug has existed in the open-source wallet code for over five years.
AI Audit Uncovers Critical Vulnerability in Coldcard Wallet Exposing $70M in BTC
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Summary
A recent vulnerability report highlights a critical flaw in Coldcard’s open-source firmware, discovered by a Reddit developer using Claude Code in just eight minutes. The issue involved a software-based pseudo-random number generator used for private key generation, resulting in the theft of $70 million in BTC from 1,196 wallets. Another user confirmed the vulnerability using Zhipu GLM 5.2. The BTC update reveals the bug has existed for over five years.
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