The Quantum Shadow: Glassnode Sounds Alarm Over 6 Million Vulnerable Bitcoin

Bitcoin’s long-term security model is facing a theoretical reckoning as new data highlights a looming technological threat. According to on-chain analytics firm Glassnode, the rise of quantum computing could potentially compromise nearly a third of the total circulating supply, exposing a significant architectural vulnerability that remains embedded in the network’s history.

A Multi-Million BTC Vulnerability

The primary concern stems from public-key exposure on the blockchain. Glassnode estimates that approximately 6.04 million BTC—nearly 30% of the total supply—could be at risk if quantum technology advances to the point of breaking current cryptographic protections. The report specifically identifies address reuse and legacy custody methods as the primary culprits, with 4.12 million BTC made vulnerable by practices that unnecessarily reveal public keys to the network.

Exchange Risks and Market Stagnation

Centralized exchanges are also in the crosshairs, collectively holding over 1.6 million BTC in addresses that could be susceptible to future quantum exploits. This security warning arrives as Bitcoin navigates a significant slump in market activity; spot trading volumes have collapsed by 81% since late 2025. While this decline mirrors the depths of the 2023 bear market, analysts suggest that the drying up of liquidity may indicate that selling pressure is finally exhausting itself, potentially setting the stage for an eventual recovery.