Glassnode data reveals that public keys for 35.4% of Bitcoin's total supply—approximately 7.12 million BTC—are already exposed on-chain, making them potential targets for future quantum computing attacks. Address reuse accounts for 25.8% of this exposure, while exchange-held coins represent an additional 11.6%.
The exposure ratio has risen steadily from 24.8% in early 2021, indicating growing vulnerability as more coins remain in addresses with revealed public keys. Glassnode notes that migrating these funds to new addresses would eliminate the quantum computing risk exposure.
Glassnode: 35.4% of Bitcoin Supply Exposed to Potential Quantum Computing Attacks
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