New on-chain analysis from Glassnode has reignited concerns about Bitcoin’s long-term security if large-scale quantum computing becomes practical. The report finds roughly 6.04 million BTC—about $469 billion or 30.2% of the supply—are tied to publicly exposed on-chain keys that could, in theory, be vulnerable to future quantum attacks.
That exposure breaks down into two categories. Approximately 1.92 million BTC are “structurally exposed,” meaning they’re associated with address types that reveal public keys as a normal part of spending. The larger portion, about 4.12 million BTC, is “operationally exposed.” This stems from user behavior—address reuse, legacy transaction patterns, and custody practices that inadvertently increase public-key visibility.
Centralized exchanges are a significant part of the operational risk. Glassnode estimates exchanges hold roughly 1.66 million BTC in operationally exposed states, or about 8.3% of total supply and nearly 40% of operational exposure. While there’s no immediate quantum threat, the concentration of funds under certain custody practices could become a structural vulnerability if quantum capabilities advance faster than defenses.
These findings have spurred discussion about post-quantum cryptographic upgrades and how developers, custodians, and institutions should factor quantum risk into long-term planning. Though quantum attacks remain theoretical today, the scale of potentially exposed assets is large enough that planning and protocol-level mitigation are increasingly on the agenda.
On a separate but related front, Binance co-founder Changpeng Zhao (CZ) has suggested that national-level and institutional accumulation of Bitcoin is quietly increasing in parts of Asia. He says some governments and institutions may add to reserves without public disclosure, driven by cultural or policy considerations that make overt crypto adoption sensitive. CZ argues that legacy financial systems risk falling behind if they ignore blockchain rails, which can offer enhanced transparency and traceability and reduce certain types of illicit activity.
Taken together, these developments present a dual dynamic for Bitcoin: emerging long-term technological risks on one side, and growing institutional or national adoption on the other. Both forces are influencing how developers, exchanges, and policymakers approach custody, upgrading cryptographic standards, and integrating crypto into broader financial systems.
