Glassnode Warns: Quantum Threat Could Expose 6.04M BTC as Spot Volumes Collapse 81%

Glassnode warns quantum computing could expose ~6.04M BTC. Spot trading volumes plunged 81% since Oct 2025, reshaping Bitcoin market dynamics —address risk

New Glassnode data has reignited debate about Bitcoin security in a potential future dominated by quantum computing. On-chain analysis highlighted by crypto trader Evans shows roughly 6.04 million BTC—nearly 30% of circulating supply—could be theoretically vulnerable if quantum advances break today’s cryptographic protections.

The report makes clear why exposure matters: many coins have already had their public keys revealed on-chain. Of the 6.04 million BTC flagged, about 4.12 million BTC stem from address reuse and outdated custody practices that unnecessarily increase public-key exposure. Centralized exchanges are also part of the picture, with more than 1.6 million BTC held in potentially exposed addresses, according to the Glassnode data.

Address reuse and legacy custody models are specific, actionable risks. Avoiding address reuse and modernizing custody solutions are straightforward ways to reduce long-term exposure — especially as the industry watches quantum-computing developments. While quantum-capable attacks remain theoretical today, the Glassnode findings serve as a reminder for investors and exchanges to review on-chain hygiene and upgrade key-management practices.

Alongside security concerns, Bitcoin market activity has shifted sharply. Spot trading volumes have collapsed roughly 81% since October 2025, returning participation to levels associated with bear-market conditions. CryptoQuant author Darkfost noted the current low participation is comparable to July 2023, emphasizing how steep the decline in spot volumes has been.

Even with broadly reduced activity, large exchanges still dominate. Binance reportedly led with $36.4 billion in trading volume and recorded $198.6 billion in October 2025. Other platforms have seen dramatic falls too: Gate.io down about 79.6% and Bybit down 66%. Analysts attribute much of the volume contraction to macro pressures — persistent inflation and prolonged US–Iran tensions have nudged investors toward traditional equities and commodities over crypto.

There is a constructive angle: historically, prolonged low spot volume often coincides with the latter stages of market corrections, when selling pressure wanes and speculative excess is flushed out. For traders and long-term investors, the dual takeaways are clear: monitor on-chain metrics like public-key exposure, and treat address hygiene and custody upgrades as part of a sound, forward-looking Bitcoin risk strategy.

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