Why 35% of Bitcoin Is Vulnerable to Quantum Attacks | Markets Outlook

Key Takeaways

• Recent research sharply reduces estimated quantum resources to break Bitcoin; nine-minute attack scenarios could fit inside block times—treat the threat as urgent.
• Many addresses expose public keys (≈35% Bitcoin, ≈70% Ethereum); attackers can harvest keys now for immediate or future quantum-enabled theft.
• Migration is difficult and expensive: post-quantum signatures are much larger, protocol redesigns and audits may cost tens to ~$100M and reduce throughput without careful fixes.
• Adopt defenses now—deploy post-quantum wallets, avoid address reuse, and support standardized NIST-era PQ algorithms to secure funds before quantum arrival.
• Institutions and stakeholders must coordinate governance, funding, and migration plans; decentralized systems require collaborative action and advocacy in forums.
• Detection will be hard—quantum theft can look like normal key compromise with months-long lag; prioritize proactive risk assessments and off-chain mitigations.

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