60亿美元，“击溃”比特币？怎么回事？

Group 1: Core Concerns about Bitcoin - A recent study indicates that the threat of a "51% attack" on Bitcoin is significantly underestimated, with attackers needing approximately $6 billion to destroy Bitcoin [1][2] - The attack can be executed by purchasing $4.6 billion worth of hardware, investing $1.34 billion in data centers, and incurring weekly electricity costs of about $130 million, allowing control of the Bitcoin network within a week [1] - The economic feasibility of such an attack is enhanced by the current thriving derivatives market, where traders can establish short positions with less than 10% of daily trading volume to gain substantial profits that could cover attack costs [4] Group 2: Industry Perspectives - There is a divergence of opinions within the industry regarding the risk of a 51% attack, with some experts downplaying the feasibility of such an attack due to the time required to accumulate mining equipment and the need for significant collateral in short-selling [5][7] - Historical instances of 51% attacks on smaller blockchains like Bitcoin Gold and Ethereum Classic highlight vulnerabilities, but larger networks like Bitcoin may have more robust defenses [9] Group 3: Bitcoin as a Hedge Against Economic Risks - Bitcoin is increasingly recognized as a potential hedge against currency devaluation, especially in the context of rising U.S. debt and inflation concerns, with companies like MicroStrategy holding significant Bitcoin assets [10][11] - The narrative around Bitcoin's role as a "digital gold" is gaining traction, with institutional interest expected to surge by 2025, as the number of publicly traded companies holding Bitcoin has doubled this year [11] - A Deutsche Bank report suggests that Bitcoin and gold could become important components of central bank reserves by 2030, reflecting a shift in reserve strategies amid geopolitical risks and inflation concerns [12]