Bitcoin hardware wallet brand Coldcard has been hit by a severe security vulnerability attack with continuing losses. Blockchain analytics firm Galaxy Research has warned that losses from this incident could swell to $130 million, making it one of the largest cold wallet security events in recent cryptocurrency history. Prominent Bitcoin security advocate Jameson Lopp stated the incident exposes the limits of Bitcoin’s “don’t trust, verify” mantra.

Details

According to The Block and CoinDesk, the Coldcard hardware wallet vulnerability has been exploited by attackers over multiple days with losses continuing to grow. Galaxy Research stated on X that it suspects losses to be even greater once the yet-unconfirmed fourth wave of attacks is included.

Security researchers found that attackers exploited a low-level vulnerability capable of bypassing the hardware wallet’s security mechanisms to extract private keys stored on the device. More concerning, some pending transactions employ replace-by-fee mechanisms, meaning address holders have only minutes to pay higher fees and move funds before attackers sweep them.

Bitcoin security expert Jameson Lopp noted this incident exposes fundamental weaknesses in the hardware wallet security model. He stated that AI is reshaping wallet security — attackers use AI to discover bugs faster while developers also use AI to accelerate code auditing. This arms race is entering a new phase.

Despite the incident significantly shaking market confidence in cold storage, Bitcoin prices showed resilience in the $63,000-$64,000 range. Traders said the market has gradually priced in this negative news.

Analysis

The reason the Coldcard incident triggered such strong industry shockwaves is that it shook the foundations of the cryptocurrency security narrative. “Cold wallets” — hardware storage devices physically isolated from the internet — have long been considered the safest way to protect crypto assets. When this last line of defense was breached, the entire industry had to re-examine its security assumptions.

From a technology evolution perspective, this incident reveals a harsh reality in hardware security: no device is absolutely safe. As attackers leverage AI to accelerate vulnerability discovery, hardware wallet update cycles and security audit frequencies must increase substantially. This poses enormous challenges for small and medium hardware wallet manufacturers that may lack resources to compete with top-tier attackers.

From a market structure perspective, this event may accelerate the development of institutional-grade custody solutions. When individually-held cold wallets face systemic risk, professional custody services employing multi-signature, geographicdispersion, and insurance coverage mechanisms become more attractive.

Perspectives

Security researchers believe this incident is a wake-up call for the entire hardware wallet industry. No single security measure can provide absolute protection; users must adopt multi-layered defense strategies.

The Coldcard team has issued security advisories recommending users immediately update firmware and transfer assets. The company stated it is workingdiligently to patch the vulnerability and cooperating with law enforcement to track stolen funds.

Industry analysts note that while market confidence is shaken short-term, long-term such incidents will drive higher industry security standards, ultimately benefiting the entire ecosystem.

Editor: GoodInfo Global News Team

Coinkite, the manufacturer of Bitcoin hardware wallets, issued an urgent security bulletin on July 31, warning Coldcard Mk3 users of a critical vulnerability. Reports indicate attackers exploited this flaw to sweep 594 BTC (worth approximately $38 million at current prices) within just 25 minutes. The Block reports this is the most severe hardware wallet security incident this year.

Event Details

According to CoinDesk and The Block, security researchers first detected unusual large-scale Bitcoin transfers. On-chain tracking data showed funds were moved from one or more Coldcard Mk3 devices to unknown addresses in an extremely short timeframe.

Coinkite responded swiftly, confirming the Mk3 model has a known security defect and advising all Mk3 users to immediately transfer assets to more secure storage solutions. The company stated it is working with white-hat hackers and the security community to release a fix as soon as possible.

Notably, the Coldcard wallet series enjoys a strong reputation in the cryptocurrency community, known for its open-source design and multiple security features. This incident exposes that even professional-grade hardware wallets may have fatal security blind spots.

Panoramic Perspective

This incident represents a major blow to cryptocurrency self-custody culture. Hardware wallets have long been considered the “gold standard” for protecting digital assets from cyber attacks, with Coldcard being among the best. When this “last line of defense” is breached, the entire industry must reassess asset security strategies.

From a technical standpoint, hardware wallet security models rely on the core assumption that “private keys never leave the device.” Once this assumption is broken—whether through physical attacks, firmware vulnerabilities, or supply chain attacks—user assets face enormous risk.

This event may also accelerate the adoption of multi-signature schemes and social recovery wallets. When a single hardware device is no longer considered absolutely secure, distributed key management solutions become the more rational choice.

For regulators, this incident once again highlights the complexity of cryptocurrency security. Unlike bank accounts, on-chain assets are nearly impossible to recover once stolen, making prevention the only effective security strategy.

Multiple Perspectives

Coinkite Official: The company has issued an urgent warning, acknowledging the Mk3 security defect and recommending users upgrade to newer models or adopt alternative storage solutions. The company promised transparent disclosure of investigation progress.

Security Community: Multiple prominent security researchers note that hardware wallet security audits need to be more rigorous and frequent. They recommend users keep firmware updated and consider multi-signature solutions as additional protection layers.

Cryptocurrency Community: The incident sparked intense debate about “whether self-custody is safe.” Some users began questioning the risk of storing large assets on a single device, while others maintain that self-custody remains superior to exchange custody.

Market Reaction: Despite this security incident, Bitcoin prices remained stable around $64,000, showing the market’s relatively strong ability to absorb single security events.

Editor: GoodInfo Global News Team