Recently, Foundry USA, a leading Bitcoin mining operation, successfully mined eight blocks in a row, sparking discussion about the concentration of power within the Bitcoin mining ecosystem. This single pool now commands over 33% (specifically, 33.63%) of the entire Bitcoin network’s processing power. Combined with AntPool’s 17.94%, just two entities control approximately 52% of the computational resources dedicated to securing the Bitcoin blockchain. Such a concentration of hashrate raises concerns about the potential for a “51% attack,” where a single entity or group could theoretically gain control and manipulate the network [1].
A 51% attack could allow this dominant force to reorganize the blockchain ledger, potentially enabling the double-spending of Bitcoin or censoring specific transactions. This kind of interference would fundamentally damage the trust and security of the entire Bitcoin system. However, experts suggest that, while technically feasible, the economic realities and logistical complexities of mounting such an attack make it extremely unlikely to occur. Successfully launching a 51% attack would require coordinating the actions of potentially thousands of individual miners within these large pools, many of whom are incentivized to uphold the integrity and rules of the Bitcoin network [1].
This situation isn’t unprecedented in Bitcoin’s history. Back in 2014, another mining pool, GHash.io, briefly surpassed the 51% threshold, triggering widespread alarm within the Bitcoin community. This public pressure led to miners leaving the pool, reducing its overall hashrate. A similar dynamic is expected to influence Foundry and AntPool: Should either of these pools attempt to act maliciously or against the best interests of the Bitcoin ecosystem, miners are likely to migrate to other, more trustworthy pools, thereby diminishing the offending pool’s influence [1].
The current concentration of hashrate underscores a broader trend within the Bitcoin mining industry: the increasing dominance of large-scale, industrial mining operations. The barriers to entry for individual and small-scale miners have become significantly higher. Consequently, a small number of powerful pools now control roughly 80% of the global Bitcoin hashrate. While this industrial consolidation doesn’t represent a direct assault on the Bitcoin protocol itself, it does raise valid questions about the long-term sustainability of Bitcoin’s foundational principle of decentralization [2].
Despite the increasing consolidation of hashrate, many cryptocurrency analysts maintain that the economic incentives for launching a 51% attack remain very weak. The costs associated with acquiring and maintaining the massive computational power required are extremely high. Furthermore, any attempt to manipulate the network would likely trigger a sharp decline in Bitcoin’s market value and erode public trust, significantly harming the attacker’s own investments. Also, there is no verified case in history that proves a 51% attack against the Bitcoin network was successful, adding more weight to the idea that such an event is not likely to happen [2].
As hashrate continues to consolidate among a select few dominant mining pools, the ongoing debate surrounding Bitcoin’s level of decentralization is almost certainly going to persist. While the underlying Bitcoin protocol remains fundamentally decentralized, the practical reality of the mining landscape is becoming increasingly centralized. It remains to be seen whether this trend poses a serious long-term threat to Bitcoin’s core ideals. As of now, the Bitcoin network seems to have the ability to resist large-scale attacks [2].
Source:
[1] 2 Bitcoin pools now control 51% of the hash power: Is BTC … (https://www.cryptopolitan.com/2-bitcoin-pools-now-control-51-of-the-hash-power/)
[2] Could Bitcoin Face a 51% Attack? Mining Pools Near 50 … (https://icobench.com/news/could-bitcoin-face-a-51-attack-mining-pools-near-50-hashrate/)