Bitcoin executed its fourth scheduled halving over the weekend, with block 840,000 cutting the per-block subsidy from 6.25 to 3.125 BTC and reducing daily issuance from roughly 900 coins to 450. The transition was exactly as the protocol's monetary policy has scheduled it since 2009, and ran without missed blocks or unusual reorgs. ViaBTC mined the milestone block, which was relayed across the global node graph in under two seconds.
The halving is the fourth in a quadrennial sequence designed to taper Bitcoin's issuance schedule asymptotically toward its 21-million-coin terminal supply. Roughly 19.7 million coins are now in circulation, leaving fewer than 1.3 million still to be minted across the protocol's remaining one hundred and sixteen years of subsidy. Annual issuance, which once stood at fifty BTC per ten minutes, now runs at an annualized inflation rate well below the long-run target inflation rate of most reserve fiat currencies — a fact that Bitcoin advocates have long described as the asset's defining monetary feature.
The economic stakes for miners are immediate. Operating cost per coin doubles overnight in real terms, and the share of revenue derived from transaction fees becomes meaningfully more important to fleet economics. Hashprice, the per-terahash daily revenue metric tracked by Luxor and others, dropped from roughly $0.12 in the days before the halving to a flatline near $0.06 by Monday morning. Older-generation rigs running at 25 to 30 joules per terahash are now unprofitable at average U.S. industrial power tariffs of seven cents per kilowatt-hour. CleanSpark, Riot, Marathon, Hut 8 and Iris Energy have all guided publicly toward more aggressive immersion-cooling rollouts and ASIC fleet upgrades through the second half of the year.
Analysts are split on what the price action means. Bernstein's digital-assets team reiterated a $150,000 cycle target on the basis that issuance halvings have historically preceded — though not directly caused — multi-quarter price expansions. Others, including Fidelity Digital Assets and Glassnode, argue that this halving is structurally different because the spot ETF complex has already pulled in tens of billions of dollars of demand, blunting the supply-shock thesis by front-loading institutional accumulation into the months before the cut. The honest answer, most traders concede, is that the precedent set is small. Three previous halvings is a sample size that does not generate strong statistical inference.
For the broader network, the more interesting question is how miners reallocate. Several large U.S. operators have already telegraphed plans to lean harder on demand-response curtailment revenue, in which a Bitcoin miner agrees to power down during ERCOT or PJM grid stress events in exchange for capacity payments. Texas-sited fleets have effectively become flexible loads on the grid, monetizing both Bitcoin block subsidies and the value of being interruptible to the local utility. The economics of that arrangement get more attractive at lower hashprice, which paradoxically protects mid-tier operators from the worst of the post-halving margin squeeze.
Watch for two data points over the next quarter. The first is hashrate. A decline of more than fifteen percent in the seven-day moving average would suggest that older fleet capitulation is meaningful and would, mechanically, increase profitability for surviving operators via the difficulty adjustment. The second is the share of block reward derived from transaction fees. The protocol's long-run security model assumes fees will eventually replace the disappearing subsidy; halving cycles are the moments at which that transition is most visible, and the post-840,000 fee market will be examined closely.