Bitcoin's price remained resilient on Tuesday, trading near $63,700 as the market absorbed the fallout from a security vulnerability in Coldcard hardware wallets. The 24-hour trading volume reached $25.9 billion, indicating sustained activity despite the shock.
Data from CryptoQuant research head Julio Moreno revealed that transfers of less than 1 BTC totaled 39,600 BTC on July 31, a figure 24.8 times larger than the preliminary estimate of 1,596 BTC stolen in the exploit. This gap underscores a broader defensive response among holders, though it does not necessarily imply that all those coins were sold.
Network Response vs. Attributed Theft
The disparity between the sub-1 BTC transfer volume and the confirmed theft tally suggests that many investors moved funds proactively, likely to secure their assets in fresh self-custody wallets. Daily active addresses also surged from 645,000 to nearly one million, a 55% increase, indicating heightened network engagement.
However, analysts caution that the sub-1 BTC bucket measures transaction size, not unique owners, and may include unrelated transfers. The ratio should be viewed as a stress gauge rather than a victim count.
Whale Moves and Market Absorption
A separate large transaction saw 16,400 BTC—worth approximately $1.04 billion—moved to a new, unlabeled wallet with no known exchange link. This route weakens the immediate sale thesis but does not rule out future exchange deposits. Bitcoin's price at 10:12 EDT was $63,657, about 1.4% above the level at the time of the whale transfer, with an intraday range of roughly 1.5%, demonstrating the market's ability to absorb the movement.
Coldcard Vulnerability Details
Coinkite, the maker of Coldcard, disclosed that a 2021 integration routed seed generation through a MicroPython fallback, bypassing the intended hardware random-number generator. Preliminary search-space estimates are about 40 bits for Mk2 and Mk3 devices, and 72 bits for later models, far below the intended 128 bits. Fixed firmware protects newly generated seeds only; users with affected seeds must create new ones and migrate funds.
Galaxy Digital's research head Alex Thorn noted, "High confidence 1,596 BTC has been stolen," linking the estimate to about 7,300 addresses. The suspected upper bound is 2,000 BTC, though unconfirmed. Coinkite co-founder Rodolfo Novak expressed devastation, and the company destroyed remaining vulnerable inventory and halted shipments, warning that the threat is ongoing.
Market Implications
While the transfers have not triggered significant selling pressure, investors should monitor exchange inflows from new wallets and known attacker addresses. The evidence currently favors custody migration over broad liquidation, but fresh wallets could later route coins to exchanges, creating potential sell pressure.
Bitcoin's resilience in the face of this security shock suggests that the market is treating it as a custody event rather than a fundamental shift. However, the situation remains fluid, and further developments could alter the outlook.
