The Bitcoin network has witnessed a dramatic increase in on-chain activity following a security breach at Coldcard, a widely used hardware wallet manufacturer. Data from K33 Research shows the seven-day active supply surpassed 890,000 BTC—a level not seen this year—as users scrambled to move funds in response to the hack. The mempool, a holding area for unconfirmed transactions, reached 89,031 pending transfers, the highest since February 2025, according to Blockchain.com. Active addresses climbed to a three-month peak of 712,000, while whale transactions (typically over $1 million) rose to a five-month high of 61,800.
Coldcard Hack Details and Estimated Losses
The exploit, which came to light earlier this month, targeted a vulnerability in Coldcard’s firmware. Although the exact attack vector remains under investigation, Galaxy Research estimates that up to 2,055 BTC—worth over $100 million—may have been compromised. The breach prompted users to transfer their Bitcoin to alternative wallets or exchanges as a precaution, fueling the surge in network metrics.
Market Implications and Historical Patterns
K33 Research highlights that similar spikes in active supply have historically coincided with local price bottoms. The logic suggests that when long-term holders move dormant coins during periods of fear, it can represent capitulation—a final sell-off that clears weak hands and paves the way for a recovery. “Such spikes often precede market bottoms, but they are not a guaranteed predictor,” the firm noted, cautioning that macroeconomic conditions and regulatory developments also play critical roles.
Despite the bearish undertone of funds moving to exchanges, the on-chain data arrives as Bitcoin trades in a range between $60,000 and $70,000. Combined with easing inflation and growing institutional interest, the elevated activity could be interpreted as a precursor to a sustained rally, though analysts urge caution against relying on a single metric.
Security and Industry Response
The breach has underscored the vulnerabilities even in hardware wallets considered the gold standard for cold storage. Coldcard, known for its open-source and security-focused design, now faces a trust deficit. In response, industry advisors recommend transferring assets to new wallets with fresh seed phrases, updating firmware, and considering multi-signature setups for large holdings. The incident may also attract regulatory attention toward hardware wallet security standards.
While Bitcoin’s price has not shown extreme volatility, the increased exchange inflows signal a potential short-term selling pressure. The broader market remains on alert, with the hack serving as a stark reminder of the persistent risks in crypto self-custody.
