Bitcoin Hash Rate Plunges 19% in Longest-Ever Decline as Miners Abandon BTC for $70 Billion AI Pivot

Capital reallocation to AI. This is the structural wildcard. Every major US-listed Bitcoin miner has shifted resources toward AI and high-performance computing (HPC) data centers . Publicly listed miners have now committed to over $70 billion in cumulative AI/HPC contracts, and AI services could constitute up to 70% of these companies' revenue by end of 2026, up from ~30% in early 2025 . Mining revenue for these firms is expected to fall from ~85% of total revenue in early 2025 to under 20% by late 2026 .

How mining firms are pivoting to AI infrastructure

The pivot is massive and accelerating:

• IREN, Core Scientific, TeraWulf, and Hut 8 are among the leaders retrofitting existing power and cooling infrastructure for AI data center workloads . TeraWulf acquired a 285-acre site in Kentucky for over 1 GW of AI/HPC capacity .
• Hut 8 is a visible example of a miner converting facilities originally built for Bitcoin ASICs into GPU-based AI compute clusters .
• The economic logic is straightforward: AI inference and training demand premium rental rates per megawatt, while Bitcoin mining margins have collapsed. Bernstein analysts report that every major US-listed miner has moved toward AI in some form .

What this means for Bitcoin's network

Network difficulty — Because difficulty adjusts downward when miners leave, the network has seen multiple large negative difficulty adjustments. Difficulty dropped 10.09% at block 953,568 (second-largest decline of 2026), falling from 138.9 trillion to 124.9 trillion, and there have been three consecutive negative adjustments — the first such streak since July 2022 . More drops are likely if hash rate continues falling.

Security budget — Bitcoin's "security budget" (the total dollar value paid to miners to secure the network) is under its most severe test. The block subsidy declines every four years, and transaction fees have not risen enough to fill the gap . With fewer miners earning less revenue, the absolute amount of energy and hardware dedicated to securing the chain is shrinking. The Fidelity Digital Assets analysis notes the long-running debate: Bitcoin proponents argue rising transaction fees will eventually replace the subsidy, but that has not materialized so far .

Mining economics — Hash price has fallen further to ~$29/PH/s/day in Q1 2026, implying continued pain . CNBC reported in February 2026 that the majority of publicly traded miners are no longer profitable . The remaining active miners are largely the most efficient operators with the lowest power costs (often sovereign-backed or institutionally funded), while marginal operators have been forced offline .

Key takeaway

The hash rate decline is not temporary — it reflects a permanent capital allocation shift away from Bitcoin mining toward AI infrastructure. The network's difficulty is adjusting downward to accommodate fewer miners, which keeps the chain running but with a smaller security footprint. Whether transaction fees eventually compensate for lost subsidy revenue — or whether the network's security budget structurally diminishes — is the open question facing Bitcoin's long-term security model.