New Review Finds at Least 4.83 Million Bitcoin (BTC) Exposed to Quantum Risk

At block 959,193 on Sept. 13, 2026, unspent outputs with visible public keys totaled at least 4,831,444 BTC. It put that total at about 24.1% of unspent Bitcoin at block 959,193, framing it as a minimum measure of potential exposure. The reconstruction classified 1,715,969 BTC as structurally exposed and at least 3,115,944 BTC as operationally exposed, with 469 BTC counted in both categories. Its operational tally excludes cases its method could not confirm, so the total is a floor. A May 20, 2026 estimate put Bitcoin exposed at rest at 6.04 million BTC, or 30.2% of issued supply, including 1.92 million structurally exposed BTC and 4.12 million operationally exposed BTC.

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