Glassnode says 35.4% of BTC supply may be exposed to future quantum attacks

About 7.12 million BTC, or 35.4% of Bitcoin’s total supply, has exposed public keys and could be vulnerable to future quantum-computing attacks, on-chain analytics firm Glassnode said. Of that total, 25.8% of supply was exposed through address reuse, while 11.6% was linked to exchange custody addresses, according to Glassnode. Glassnode said moving BTC with exposed public keys to new addresses can eliminate the related risk. The firm added the exposure does not mean assets face immediate theft, and a real attack would require quantum computers powerful enough to derive private keys from public keys.