Sriram-Ramakrishnan·hackernoon.com·· 3 min read
Coldcard's Entropy Bug Exposes Hidden Weakness in Hardware Wallet Security
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TL;DR
A critical vulnerability in Coldcard's hardware wallets has exposed thousands of users' funds to attack, highlighting the need for continued vigilance in self-custody practices.
A critical vulnerability in Coldcard's hardware wallets has been exposed, allowing attackers to drain funds from thousands of users. The bug, which was introduced in a firmware update five years ago, compromised the security of over $89 million in Bitcoin. Here's what you need to know.

Key Takeaways
- •Update your Coldcard firmware immediately to prevent future seed compromises
- •Migrate to a new seed and clean firmware if you've already been affected
- •Don't rely solely on hardware wallets for security - use multiple layers of protection
coldcardhardware walletbitcoinsecurity
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Originally published by Sriram-Ramakrishnan on hackernoon.com. Summarized by ContentBuffer.
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