A Duke University finance professor, Campbell Harvey, has said that a 51% attack on Bitcoin, long dismissed as a theoretical exercise that would only destroy value for whoever tried it, has quietly become something an attacker could profit from because of today’s derivatives markets.
However, many BTC supporters dismissed the claim made during the July 12 episode of Scott Melker’s Wolf of All Streets podcast, arguing that it ignores the practical economic barriers that would likely stop such an attack.
According to Harvey, a 51% attack, where a single entity gains the majority control of the Bitcoin network’s hash power, has always been technically possible but made little economic sense. This is because an attacker would need to spend billions of dollars on mining hardware but would only end up destroying the value of the asset they had just compromised.
“Why would you spend billions investing in mining equipment, take over the network, but the price of Bitcoin collapses to zero?” Harvey posited. “So you spend all that money and get nothing?”
But now, he believes that equation has changed, given that derivative markets carry enough liquidity for an attacker to short BTC before launching an attack and profit as the price falls.
“The difference today is the derivatives markets,” he told Melker. “What you want to do is simultaneously during the attack take a short position on Bitcoin, and with a short the ideal outcome is if the asset goes to zero.”
The professor did point out that the trade would have to take place on offshore derivatives platforms since it amounted to blatant market manipulation. In his research paper titled “Gold and Bitcoin,” he estimated that such an operation would cost about $8 billion, which is roughly 50 basis points of BTC’s total market value, although he framed the scenario as a risk management exercise and not a prediction, arguing that investors should consider every credible threat instead of dismissing uncomfortable possibilities.
When asked the same question, Grok estimated that anyone looking to carry out such an attack would need to spend more than $10 billion on mining machines and about $1.3 million in electricity costs every hour. It also noted that any attempt would most likely be detected immediately.
Interestingly, Harvey does not think the same scenario can work on Ethereum. According to him, since Ethereum switched to proof-of-stake, an attacker has to acquire more than half of the liquid ETH supply to control one-third of all staked Ether, which would rapidly drive prices higher during the attempt and eliminate the short-selling opportunity he described for Bitcoin.
The educator’s criticism of Bitcoin went beyond its network security, as he argued that the OG cryptocurrency is too volatile to qualify as a saf
小靓分析：
🦊 小靓解读
杜克大学教授指出，比特币因衍生品市场可能面临80亿美元的51%攻击风险，而以太坊因PoS机制更安全。但多数BTC支持者认为，这忽略了实际经济壁垒，攻击可行性存疑。
📊 市场影响
短期来看，该言论可能引发BTC价格小幅波动，但实际影响有限。中期若市场共识认为BTC安全受威胁，可能压制投资者信心，而ETH相对更受青睐。
💡 操作建议
建议交易者关注BTC和ETH的算力数据，监控网络健康度。控制仓位，避免因恐慌性消息追涨杀跌，保持风险中性策略。
风险提示：
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