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Glassnode research puts 6.04 million BTC — worth about $469 billion — in the crosshairs of future quantum computing attacks, accounting for 30.2% of all Bitcoin ever issued. The figure covers any UTXO whose public key is already visible on-chain, not the speculative horizon of when such an attack becomes feasible.
Why it matters
Glassnode splits the exposure into two buckets: 1.92 million BTC in structural exposure, where the public key is permanently visible by protocol design (typically older pay-to-public-key outputs), and 4.12 million BTC in operational exposure, driven almost entirely by address reuse. Operational exposure is the lever the community actually controls — stop reusing addresses and the bucket shrinks.
Market impact
Exchanges hold the largest single concentration: 1.66 million BTC, or 8.3% of total supply and roughly 40% of all operationally unsafe coins. That makes venue-side custody a near-term vector long before any quantum hardware arrives, and puts the operational-fix burden squarely on the platforms rather than individual holders. The threat remains theoretical, but the supply-side map is now public.
Source: [Nearly $500B in Bitcoin Is Exposed to Future Quantum Computing Attacks: Glassnode — Decrypt](https://decrypt.co/368721/nearly-500b-bitcoin-exposed-future-quantum-computing-attacks-glassnode)
Frequently asked questions
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What does Glassnode mean by Bitcoin exposed to quantum attack risk?
Glassnode counts every UTXO whose public key is already visible on-chain — 6.04 million BTC worth about $469 billion, or 30.2% of all Bitcoin ever issued. A sufficiently powerful quantum computer could theoretically derive the private key from that exposed public key and spend the coins.
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What's the difference between structural and operational quantum exposure?
Structural exposure covers 1.92 million BTC where the public key is permanently visible by protocol design, mostly older pay-to-public-key outputs. Operational exposure covers 4.12 million BTC and stems from address reuse — the public key becomes visible the first time an address sends a transaction.
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Why are exchanges the biggest single holder of quantum-exposed Bitcoin?
Glassnode puts 1.66 million BTC, or 8.3% of total supply, on exchanges — roughly 40% of every operationally unsafe coin. That concentration means venue-side custody practices, not individual wallets, drive the largest share of the address-reuse bucket.
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Is the quantum threat to Bitcoin immediate?
No. The exposure is theoretical and depends on quantum hardware powerful enough to break elliptic-curve cryptography, which does not yet exist. The value of the Glassnode research is mapping the supply-side surface area, not declaring an imminent attack.
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Can the quantum-exposed Bitcoin supply be reduced?
The 1.92M-BTC structural bucket is fixed by protocol design and cannot be retroactively hidden. The 4.12M-BTC operational bucket can shrink if holders stop reusing addresses, since the public key only becomes visible once a transaction is broadcast from that address.
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