Bitcoin's network hashrate fell by approximately 3% in December 2025, marking the second consecutive month of decline, according to JPMorgan. The hashrate decreased to 1045 EH/s, indicating a slight easing in miner competition. However, mining profitability continues to decline. Data shows that the average daily block reward income per EH/s dropped by 7% month-over-month and 32% year-over-year, reaching a historic low. This decline is attributed to falling Bitcoin prices, the impact of the recent halving, and rising energy costs.