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      Coldcard Wallet Vulnerability Leads to $100 Million in Bitcoin Theft

      Coinkite's Coldcard hardware wallet has been identified as having a significant entropy vulnerability that has been present since 2021. This flaw has resulted in the theft of over $100 million in Bitcoin, primarily affecting users of single mnemonic wallets. The weak entropy allowed attackers to successfully guess private keys, raising concerns about the security of single-signature self-custody solutions within the Bitcoin community.

      In response to this vulnerability, multi-vendor multisignature (multisig) solutions are gaining traction as a more secure alternative for Bitcoin custody. Long-term holders are now encouraged to use multisig addresses that incorporate keys from various wallet vendors, such as Trezor Safe 7, Ledger Nano, and Casa recovery keys, forming a 2-of-3 multisig setup. This approach minimizes dependence on a single hardware vendor and enhances security against potential attacks, including wrench attacks.

      Additionally, the rise of multisig has led to the development of Bitcoin insurance services, such as AnchorWatch, which are priced in Bitcoin. However, users must be aware of the complexities involved with multisig setups, including the necessity to manage threshold keys and maintain copies of the multisig script or template to ensure independent recovery of funds if the wallet service becomes unavailable.

      © 2026 KLEA News. All Rights Reserved. This article is provided for informational purposes only. It is not offered or intended to be used as legal, tax, investment, financial, or other advice.

      Source: KLEA News

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