Update
Bitcoin Quantum Risk Rises as 7.12M BTC Have Visible Public Keys
Bitcoin holdings with visible public keys now total 7.12 million BTC, according to Glassnode. This represents 35.4% of the network's total issued supply. An earlier Glassnode snapshot put exposed Bitcoin at 6.04 million BTC, or 30.2% of supply, on May 20. The rise is 1.08 million BTC and 5.2 percentage points. Address reuse exposes 25.8% of Bitcoin's issued supply, including 11.6% held on exchanges. Wallet behavior creates operational exposure when a transaction reveals a key controlling unspent coins. Reusing the address can leave remaining coins or later deposits linked to that visible key. Glassnode tracks unspent Bitcoin linked to public keys already visible on the blockchain. Shor's algorithm could let a sufficiently powerful quantum computer recover the corresponding private keys.