CZ Responds to Coldcard Wallet Attacks: Self-Custody Security Responsibility Lies with Users
CZ addressed the ongoing attacks on Coldcard wallets, where stolen BTC valued over $71 million, stating that in a self-custody model, even if developers fix vulnerabilities, previously generated wallets cannot be repaired. For users with isolated devices, developers cannot directly contact them to provide warnings; until users take proactive measures, the relevant wallets may remain exposed to attack risks. CZ supports self-custody but emphasizes that the security responsibility lies with the users themselves.
In the crypto security market, hardware wallet vulnerabilities have triggered a reassessment of trust in self-custody; funds may flow towards more diversified storage or custody services, putting pressure on hardware wallet manufacturers, while security tools emphasizing user education and multiple backups benefit.
ABAB AI Insight
Coldcard, a well-known Bitcoin hardware wallet, had a firmware entropy source flaw in 2021 that made the seed predictable, allowing attackers to reconstruct private keys and transfer funds without physical access to the device; the scale of the incident expanded from an initial estimate of about $38 million to over $70 million, exposing the latent risks of long-unused cold wallets.
In terms of capital pathways, users are shifting from exchanges or hot wallets to hardware self-custody to avoid centralized risks but suffer losses due to historical firmware vulnerabilities; resources are moving from single-device trust to decentralized storage and proactive migration, motivated by the need to bear verification and update responsibilities under the principle of "trust no one."
Similar analogies can be seen in earlier incidents involving other hardware or software wallets with entropy and implementation flaws, as well as similar vulnerabilities in traditional finance with smart cards or tokens. Currently, Bitcoin self-custody is at a stage of "technological maturity but concentrated outbreaks of historical legacy risks."
Structural judgment belongs to technological substitution: when systemic flaws occur in hardware randomness implementation, the security assumptions of self-custody are broken, and the responsibility shifts back from the manufacturer’s invisible guarantee to the user, pushing the industry from single-device reliance to multi-layer verification and decentralized holding.
ABAB News · Law of Cognition
- The ultimate responsibility of self-custody always lies with the user.
- Historical vulnerabilities are harder to eliminate than new ones.
- The inability of isolated devices to receive patch notifications is a risk in itself.