Over 35% of Bitcoin Supply Faces Potential Quantum Risk, New Data Shows

Glassnode data shows roughly 7.12 million BTC, or 35.4% of Bitcoin’s circulating supply, has its public key exposed on the ledger, leaving those coins theoretically vulnerable to future quantum attacks. Most holders can address the issue by moving funds to fresh addresses, but coins tied to Satoshi Nakamoto may never be migrated. The finding matters because quantum computing could eventually let attackers derive private keys from exposed public keys, putting a large share of supply at risk. Watch for wallet migrations to new address types and any progress on post-quantum signature schemes in Bitcoin’s upgrade pipeline.