65% of Bitcoin Supply Not Vulnerable to Quantum Threat: Ark Invest

Ark Invest's recent white paper, co-authored with Unchained, estimates that approximately 65.4% of the Bitcoin supply is not vulnerable to potential breakthroughs in quantum computing. Around 34.6% of the supply, equivalent to roughly 5 million BTC (25% of the total) and 1.7 million BTC (8.6%), remains at risk, categorized as migratable due to address reuse or lost in older P2PK addresses. The report suggests that breaking Bitcoin’s elliptic curve cryptography would require significant quantum computing power, likely taking considerable time to achieve. While a quantum computer with one million physical qubits is expected by 2027, Ark Invest views quantum risks as a long-term concern, providing the Bitcoin community time to prepare. The paper emphasizes the eventual need for Bitcoin to implement quantum-safe address formats and post-quantum cryptography, acknowledging the challenges posed by its decentralized governance structure. BIP-360 is discussed as a potential step, but it's noted that it doesn't include essential post-quantum digital signatures.

(Source：Cointelegraph)