35.4% of BTC has the risk of public key exposure.

Approximately 35.4% of BTC (7.12 million coins) are at risk of public key exposure, and this portion of assets may become a target for future quantum computers. Of the total supply, 25.8% is exposed due to address reuse, and 11.6% is held by exchanges. Transferring these tokens to new addresses eliminates this exposure risk. (glassnode)