4. Nearly 7 million BTC, about 35% of circulating supply, is potentially vulnerable to long-range quantum attacks.
BlackRock says roughly 1.9 million BTC sit in address types that expose unhashed public keys, and another 5 million BTC are in reused addresses where public keys were exposed in past transactions but still hold UTXOs. That makes the exposed-public-key problem a real market-structure issue, not a fringe concern.
Learn more with the Project Eleven Bitcoin Risq List (cited in the paper):
bitcoin-risq-list.projectele…