Bitcoin’s network hashrate recently crossed 900 exahashes per second, a level that would have been unimaginable even two years ago. That’s not a routine milestone - it’s a signal that miner economics have fundamentally shifted since the April 2024 halving cut the block subsidy from 6.25 BTC to 3.125 BTC.

The orthodox expectation after a halving is that some portion of miners - those operating older, less efficient hardware - capitulate and go offline, causing a temporary hashrate dip before difficulty adjusts downward. That happened briefly in mid-2024. But by late 2024 and into 2025, hashrate began climbing again, and it hasn’t stopped.

The explanation isn’t mysterious: Bitcoin’s price appreciation partially offset the subsidy cut for miners holding BTC on their balance sheets, and next-generation ASIC hardware - particularly machines built around 3nm and 5nm chip architectures - dramatically improved joules-per-terahash ratios. Bitmain’s Antminer S21 series and competing rigs from MicroBT pushed efficiency benchmarks that made previously marginal operations viable again.

What’s less discussed is what this means for fee pressure.

With the block subsidy now contributing a smaller proportion of total miner revenue than at any point in Bitcoin’s history, the network’s long-run security model depends increasingly on transaction fees filling the gap. In 2024, fees as a share of miner revenue spiked during Ordinals and Runes activity, briefly exceeding 20% of block rewards. But that activity has cooled. As of mid-2026, fees are typically contributing somewhere in the low single-digit percentage range of miner income - not catastrophic, but not the trajectory the fee-market thesis requires.

Miner behavior is adapting in other ways. Publicly traded miners like Marathon Digital and Riot Platforms have been accumulating BTC rather than selling immediately post-block, functioning more like leveraged Bitcoin holding companies than pure infrastructure operators. That changes their risk profile significantly - they’re now exposed to price drawdowns in a way that purely cash-flow-focused mining operations are not.

The hashrate milestone is real and reflects genuine investment in the network. But it also means difficulty is high, margins are compressed for anyone running older hardware, and the fee market still hasn’t demonstrated it can sustain security at scale without price appreciation doing the heavy lifting. That’s the unresolved tension sitting underneath every new all-time high in hashrate.