Bitcoin’s mining environment has tightened significantly as the network’s computing power rebounded to near-record highs. On October 29, the protocol adjusted its mining difficulty upward by 5.54%, raising the barrier to entry for new blocks from 140.58 trillion to 148.36 trillion. This adjustment follows a similar 5.92% increase in mid-October, reflecting a period of intense competition among miners. While the surge in hashrate strengthens the network’s security, it simultaneously drives down the revenue available to individual operators, pushing daily earnings per unit of computing power to their lowest levels in three months.

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Hashrate Reversal After Sharp Decline

According to Jamie Coutts, chief crypto analyst at Real Vision, the current recovery marks a significant turnaround from a period of severe contraction. The network’s 14-day average hashrate fell by 23% between its peak in October 2025 and February 2026, a drop Coutts described as the steepest since the 2021 Chinese mining ban. This decline was driven by harsh winter weather and a growing trend among mining firms to pivot toward artificial intelligence infrastructure. However, Coutts noted that the trend reversed sharply after July 17. Over the subsequent 102 days, the hashrate climbed by 21%, adding roughly 185 exahashes per second. This recovery has brought the network within 6% of its previous all-time high, representing the largest absolute gain in a comparable recovery period since 2018.

AI Shift and Network Security

The resurgence in Bitcoin mining capacity is notable given that several publicly traded companies have redirected resources toward high-performance computing and AI data centers. These sectors often offer more predictable long-term revenue than volatile mining operations. Despite this corporate shift, data from Look Into Bitcoin indicates that the network’s total computing power has reached its highest level in seven months. This suggests that capacity is expanding in other parts of the ecosystem, offsetting equipment retired or repurposed by major players. Coutts argues that this influx of power enhances network security by increasing the cost of potential attacks. The willingness of operators to deploy resources despite thin margins signals continued confidence in Bitcoin’s long-term utility.

Revenue Squeeze and Efficiency Divide

The rising difficulty has immediate financial consequences for miners. The latest adjustment reduces expected earnings per unit of computing power by approximately 5.24%, while the two October increases combined cut revenues by about 10.5%. Consequently, the hashprice—the expected daily revenue per petahash—has fallen to around $33, its weakest point since August. This level is significantly lower than the $40 average seen in September. The drop creates a stark divide based on equipment efficiency. For miners using older machines operating at 25 joules per terahash, the current hashprice results in a daily shortfall if electricity costs exceed 5.45 cents per kilowatt-hour. In contrast, operators with more efficient 20 J/TH equipment can still maintain a modest surplus under the same conditions. This dynamic forces less efficient miners to either cut costs drastically or face insolvency, widening the gap between high-efficiency and low-efficiency operators.