Bitcoin hashrate declined about 4% year-to-date in Q1 2026 to roughly 1 ZH/s, the first first-quarter drop since 2020. Weak mining economics (production costs near $90k vs. spot ≈ $67k) have driven many public miners to reallocate capital into AI and high-performance computing, financed by debt and bitcoin sales. That reduces reinvestment in mining, makes hashrate growth more price-sensitive, risks exits by smaller operators, and could raise security concerns while possibly increasing geographic decentralization as U.S. public miners’ share (>40% of global hashrate) falls.

Facts from the summary: hashrate fell ~4% YTD to ~1 ZH/s (first Q1 decline since 2020); production costs are near $90k vs. spot ≈ $67k; public miners are reallocating capital into AI/HPC funded by debt and bitcoin sales, reducing reinvestment and increasing price-sensitivity and risk of smaller-operator exits; U.S. public miners account for >40% of global hashrate so reduced dominance could increase geographic decentralization. These points imply negative mining economics and added selling pressure, supporting a moderately bearish short-term view and meaningful market impact.