Bitcoin's largest holders are using the Coldcard security crisis as a buying opportunity, snapping up coins that smaller investors have been selling in a wave of fear-driven distribution. Wha
Bitcoin's largest holders are using the Coldcard security crisis as a buying opportunity, snapping up coins that smaller investors have been selling in a wave of fear-driven distribution.
On-chain analytics firm Santiment reports that wallets holding between 10 and 10,000 BTC added 19,610 Bitcoin from July 29 onward, a 0.14% increase in holdings for that cohort. Over the same period, wallets holding less than 0.01 BTC reduced their balances by 0.55%, according to Santiment data cited by Coinpedia. The divergence points to a classic accumulation pattern in which larger, better-capitalised participants absorb supply that retail holders are offloading under pressure.
The trigger for the sell-off is the ongoing fallout from a serious vulnerability in Coldcard hardware wallets. The flaw, traced to a firmware integration error introduced in March 2021, caused affected devices to replace their hardware random-number generator with a predictable software alternative when generating wallet seed phrases. That weakness meant an attacker could reconstruct private keys without ever physically accessing a device.
The first wave of attacks hit on July 30, when an attacker drained 1,196 Bitcoin addresses in just 41 minutes, taking roughly 1,082 BTC worth approximately $70 million at the time. Galaxy Research subsequently identified additional attack waves. Losses across all waves have now reached roughly 1,367 BTC from 4,585 addresses, worth close to $89 million, per Galaxy Research figures reported by IG. The root cause was a five-year-old firmware bug rather than any flaw in the Bitcoin protocol itself.
Coinkite, the Canadian firm behind Coldcard, confirmed the vulnerability, released emergency firmware patches, and halted shipments of affected units. However, the fix cannot retroactively secure wallets whose seeds were generated under the flawed firmware. Users who created wallets on vulnerable devices are advised to move funds to freshly generated, unaffected addresses.
The incident has unsettled confidence in self-custody more broadly. Some retail holders have moved BTC back onto centralised exchanges, reversing a long-standing preference for cold storage. The security scare appears to have amplified existing retail nervousness, with Santiment noting that the decline in confidence has created a wider wave of small-wallet selling even among users not directly affected by the exploit.
For larger holders, the shakeout appears to represent an opportunity. Santiment noted that the accumulation spans the entire 10 to 10,000 BTC wallet cohort rather than a single address, suggesting the buying is broad-based rather than the result of one actor.
Sources:Coinpedia: Bitcoin Whales Buy 19,610 BTC as Retail Sells After Coldcard Security ScareTechSpot: Coldcard Firmware Flaw Let Hackers Drain $70 Million in Bitcoin in 41 MinutesCoinDesk: Coldcard Exploit Reignites Bitcoin Self-Custody Debate
