At block 950,000, 6.90 million BTC are cryptographically exposed, equal to 34.45% of circulating supply. That headline number should not be read as the amount of bitcoin likely to be lost in a quantum event. Practical risk depends on whether the owner can respond, whether the entity is operationally active, whether the balance is large enough to justify the cost of attacking, and how quickly funds can be migrated. Considering those dimensions, the risk profile is narrower, more concentrated, and more dormant than the raw exposure figure implies.

6.90M BTC Raw exposed supply

34.45% Raw exposed share

3.33M BTC Active >=1 BTC exposure

2.28M BTC Dormant unknown >=1 BTC