Ark Invest and Unchained have released a report highlighting that 34.6% of Bitcoin's supply remains vulnerable to potential quantum computing breakthroughs. The report identifies approximately 5 million BTC, or 25% of the total supply, as at risk due to address reuse, alongside 1.7 million BTC (8.6%) in early P2PK addresses and 200,000 BTC (1%) in P2TR addresses. While the threat of quantum computers breaking Bitcoin's elliptic curve cryptography is not imminent, Ark Invest emphasizes the need for the Bitcoin community to develop quantum-resistant solutions over the long term.