狼真的来了？量子计算对比特币威胁“不再是理论”，分析师：20-50%比特币存在“安全隐患”

Core Viewpoint - The threat of quantum computing to Bitcoin is transitioning from theoretical to practical, with significant implications for institutional investors and the cryptocurrency's status as a reliable store of value [1][2][4]. Group 1: Quantum Risk Assessment - Approximately 32.7% of Bitcoin's supply, equating to about 6.51 million Bitcoins, is at risk from potential quantum computing attacks [2]. - Jefferies estimates that 20-50% of Bitcoin may be vulnerable, with 4 to 10 million Bitcoins at risk due to address reuse, particularly affecting exchanges and institutional wallets [3]. - The security of Bitcoin is challenged by quantum computers potentially breaking the elliptic curve digital signature algorithm (ECDSA) and the SHA-256 algorithm that underpins Bitcoin's proof-of-work system [10]. Group 2: Institutional Response - Christopher Wood has completely liquidated his 10% Bitcoin position in favor of a 5% allocation to physical gold and 5% to gold mining stocks, citing concerns over quantum computing undermining Bitcoin's reliability as a store of value [4][6]. - Despite some institutions reducing their Bitcoin exposure, others, like Harvard University, have increased their Bitcoin holdings by nearly 240%, indicating a divided institutional stance [9]. Group 3: Market Impact - Bitcoin has declined 6.5% relative to gold this year, while gold has risen 55%, reflecting a shift in investor sentiment regarding Bitcoin's status as "digital gold" [2]. - The Bitcoin-to-gold ratio is projected to drop to 19.26 by January 2026, indicating a reevaluation of Bitcoin's value proposition [2]. Group 4: Governance Dilemma - The Bitcoin community faces a governance dilemma regarding whether to destroy quantum-vulnerable coins to protect system integrity or to take no action and risk theft, creating a conflict between protocol security and property rights [5][8]. - Any decision to destroy vulnerable tokens would reduce Bitcoin's effective supply, potentially supporting prices but requiring a controversial decision-making process [8]. Group 5: Technological Outlook - Current quantum computers possess about 105 qubits, while estimates suggest that breaking Bitcoin's private keys may require 13 million qubits, indicating a significant technological gap [7]. - Some experts believe that the threat from quantum computing could materialize in as little as five years, while others estimate a timeline of 20 to 40 years [7]. Group 6: Mitigation Strategies - Address reuse is a critical vulnerability, and strategies such as avoiding address reuse and transitioning to quantum-resistant addresses are seen as essential mitigation measures [10]. - Bitcoin developers are working on proposals to enhance quantum resistance, although these are still in draft and testing phases [7].