60亿美元“击溃”比特币？怎么回事？

Core Insights - Bitcoin faces a significantly underestimated threat of a "51% attack," which could be executed with approximately $6 billion [1][2] - 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] - The economic feasibility of such an attack is enhanced by the current thriving derivatives market for Bitcoin, allowing traders to short Bitcoin and potentially cover attack costs [5][7] Group 1: 51% Attack Threat - A "51% attack" occurs when a single entity controls more than half of the blockchain network's computing power, enabling them to alter the ledger and execute double-spending attacks [3] - The cost of executing a 51% attack is only 0.26% of Bitcoin's total network value, which is much lower than many investors expect [7] - Concerns about the feasibility of such attacks are heightened by the lack of effective market manipulation safeguards in many regions [7] Group 2: Industry Perspectives - There is a divide in the industry regarding the risk of a 51% attack, with some experts, like Matt Prusak, arguing that the economic feasibility is overstated due to the time required to accumulate mining equipment and the need for substantial collateral to short Bitcoin [2][8] - Historical instances of 51% attacks on smaller blockchains, such as Bitcoin Gold and Ethereum Classic, highlight vulnerabilities in less supported networks [8] - The growing acceptance of Bitcoin as a hedge against macroeconomic risks is reflected in the increasing number of publicly traded companies incorporating Bitcoin into their balance sheets, rising from under 100 to over 200 in 2025 [9] Group 3: Bitcoin as a Hedge - Bitcoin is increasingly viewed as a potential hedge against currency devaluation, similar to gold, especially in the context of rising U.S. debt and inflation concerns [9][10] - Reports indicate that central banks may begin to include Bitcoin in their reserves by 2030, reflecting a shift in the perception of digital assets as complementary to traditional currencies [11] - The decline in the dollar's share of global reserves from 60% in 2000 to an expected 41% by 2025 is contributing to the rising interest in both gold and Bitcoin [11]