Bitcoin’s mining difficulty adjusted upward again this month, continuing a run that has pushed the metric to successive all-time highs in 2026. The network’s hashrate has followed the same trajectory, consistently printing above 800 exahashes per second - a figure that would have seemed implausible even two years ago.
The proximate cause is straightforward: institutional mining operations have deployed next-generation ASIC hardware at scale, and energy procurement deals struck in 2024 and 2025 have kept their operating costs low enough to remain profitable despite compressed block rewards. The April 2024 halving dropped the block subsidy to 3.125 BTC, and those economics have fully worked their way through the industry now.
For smaller miners - typically operations running under 5 petahashes - the arithmetic is brutal. Their cost per bitcoin mined has risen in lockstep with difficulty, while they lack the leverage to negotiate industrial power rates or the capital to refresh hardware on an 18-month cycle. Some in the mining community have observed that the post-halving consolidation phase this cycle has been sharper than after 2020, though direct data comparisons across cycles are complicated by different energy price environments.
The Efficiency Gap Is Widening
The machines dominating hashrate in 2026 - units from Bitmain, MicroBT, and Canaan operating in the 20–25 joules-per-terahash range - are not accessible to hobbyist or small-commercial miners in any practical sense. The upfront hardware cost combined with lead times and minimum order requirements effectively gate that tier of the market.
What this produces, structurally, is a mining industry that increasingly resembles traditional commodity extraction: capital-intensive, dominated by a small number of large players, with thin margins determined by energy cost rather than technical ingenuity.
Publicly listed miners like Marathon Digital and CleanSpark have disclosed hashrate targets and expansion plans that assume continued difficulty growth, which is something of a self-fulfilling dynamic - their own deployment schedules contribute to the difficulty increases that pressure their smaller competitors.
Transaction Fees Aren’t Saving Anyone
One anticipated offset to lower block subsidies was higher fee revenue, driven by Ordinals, Runes, and increased on-chain activity. That thesis has had mixed results. Fee revenue remains volatile and episodic rather than providing the steady income floor miners need for capacity planning.
The network is more secure than it has ever been by hashrate measures. Whether that security is being purchased at the cost of meaningful mining decentralization is a harder question, and one the industry hasn’t settled.