60亿美元就能“击溃”比特币？

Core Insights - Bitcoin faces a significantly underestimated threat of a "51% attack," which could be executed with approximately $6 billion [1] - The attack could be completed within a week by investing $4.6 billion in hardware, $1.34 billion in data centers, and incurring weekly electricity costs of about $130 million [1] - Compared to gold, Bitcoin's risks are substantially higher, as it is susceptible to systemic threats that gold does not face [1][4] Group 1: Attack Feasibility - Attackers can profit from shorting Bitcoin in the derivatives market during a price crash, which could cover the attack costs [3][5] - The cost of executing a 51% attack is only 0.26% of Bitcoin's total network value, making it economically viable [5] - The current thriving derivatives market provides economic incentives for potential attackers [5] Group 2: Industry Perspectives - There is a divide in the industry regarding the severity of the attack risk, with some experts downplaying the feasibility of such attacks [6] - Industry professionals argue that accumulating and deploying sufficient mining equipment would take years, making the attack impractical [7] - Concerns about collateral requirements for shorting Bitcoin and the potential for exchanges to halt suspicious trading further complicate the attack scenario [8] Group 3: Historical Context - Previous instances of 51% attacks on smaller blockchains like Bitcoin Gold and Ethereum Classic demonstrate vulnerabilities in less supported networks [9]