Bitcoin’s hashrate crossed 1 zettahash per second earlier this summer, a milestone that would have seemed implausible even three years ago. To put that in concrete terms: the network is now performing more than one sextillion SHA-256 computations every second. It is, by any engineering measure, the most computationally fortified system humans have ever built. The price of BTC at the time of that crossing? Quietly range-bound.
This decoupling between network strength and market price is not new, but the degree of it is striking post-halving. The April 2024 halving cut the block subsidy to 3.125 BTC. Miners have continued to expand capacity regardless - a signal that large-scale operations are either betting on higher future prices or running efficient enough rigs to remain profitable at current levels. Publicly traded miners like Marathon Digital and Riot Platforms have continued deploying next-generation ASICs through 2025 and into 2026, even as margins compresseed.
What sustained hashrate growth actually means for Bitcoin is underappreciated in most market commentary. A higher hashrate raises the cost of a 51% attack to levels that make such an attack economically incoherent for any plausible attacker - state-level or otherwise. It also means the difficulty adjustment algorithm keeps pushing the bar upward, locking in that security in a self-reinforcing cycle.
Mining Is Increasingly Industrial, and Increasingly American
The geographic composition of Bitcoin mining has shifted materially since China’s 2021 ban. The United States now hosts a plurality of global hashrate, with significant concentrations in Texas, Kentucky, and Wyoming. This matters for regulatory risk: it makes an outright ban politically and practically harder than it was when mining was concentrated offshore. American utilities have also begun treating Bitcoin miners as flexible load customers - entities that can be curtailed during peak demand, which has made miners more palatable to grid operators rather than a target for them.
The Fee Market Is Still the Unanswered Question
The block subsidy declining on a fixed schedule means transaction fees must eventually carry more of the weight for miner revenue. That transition is not imminent - subsidies will remain meaningful through the next halving in 2028 - but it is a structural question that hashrate milestones do nothing to resolve. Whether Bitcoin’s fee market can generate sufficient revenue to sustain current security levels without a subsidy is arguably the most important long-term question in the protocol, and it remains genuinely open.
The network has never been stronger. What it earns from fees, long-term, is a different story entirely.