Academic Research Issues Warning
On October 9, Duke University finance professor Campbell Harvey highlighted in his latest research that there may be significant misconceptions about Bitcoin's security in the market. He believes that the feasibility of the so-called "51% attack" is widely underestimated. An attacker could potentially control the Bitcoin network short-term with an investment of approximately $6 billion.
Breakdown of Attack Costs
In his research, Harvey further breaks down the costs: around $4.6 billion could be used to purchase mining hardware, about $1.34 billion for building and deploying large data centers, and approximately $130 million per week for electricity expenses. Overall, it could take just one week for an attacker to accumulate enough computing power to gain majority control of the Bitcoin network, allowing interference with transaction confirmations or initiating double-spending attacks.
Comparison Between Bitcoin and Gold
Harvey emphasizes that while investors often regard both Bitcoin and gold as hedges against currency devaluation, their risk characteristics are entirely different. Gold's physical properties make it difficult to manipulate on a large scale at low cost, whereas Bitcoin relies on computational power for security, theoretically permitting concentrated attacks. This implies Bitcoin is not an entirely invulnerable "digital gold".
Opposition from the Market
Despite the attention the research has garnered, some industry insiders question its practicality. Critics argue that gathering and deploying millions of mining machines in a short time would be nearly impossible, with global supply chain bottlenecks and production cycles significantly increasing implementation timelines. Additionally, attackers would face significant financial pressure, such as providing substantial collateral during Bitcoin short-selling, and exchanges might suspend trading if market manipulation is detected, reducing the attack's effectiveness.
Implications for Investors
This study is not the first to challenge Bitcoin's security model, but its quantification of specific costs has sparked widespread discussion. Analysts suggest that the research reminds market participants not to assume Bitcoin's security is untouchable based solely on its long-term price rise and blockchain's decentralized design. Institutional investors and regulators may need to reassess the role of crypto assets within the financial system.
Regulatory and Industry Response
Following Harvey's research, some industry experts have called for accelerated regulation of the concentration of computational power and the operational models of large mining firms. Bitcoin's security largely depends on the distribution of miners, but in recent years, the share of computing power by certain large mining pools has increased, inadvertently raising systemic risks. Regulatory agencies might need to collaborate with the industry to explore ways to mitigate the potential risks of excessive concentration of computational power.
Looking Ahead
Though controversial, Harvey's perspective undeniably serves as a wake-up call for the market. If Bitcoin indeed faces a risk of low-cost attacks, its narrative as a "safe-haven asset" could be challenged. In the future, as the structure of computing power changes, energy costs fluctuate, and regulatory intervention progresses, Bitcoin's ability to maintain network stability will be closely watched by investors.
The Digital Gold Myth Awaits Testing
Overall, Duke University's research highlights potential structural weaknesses in Bitcoin's security. Regardless of the feasibility of such attacks, the study at least urges the market to recognize that the myth of "digital gold" still requires more rigorous scrutiny. Bitcoin's future depends not just on price trends, but also on whether its technology and structures can withstand potential long-term risks.
