Sharp one-day drops in Bitcoin’s estimated hashrate have been recorded.

2025-12-14: 1,053 → 943 EH/s → Δ = −110.5 EH/s (−10.5% d/d)
2025-12-12: 1,179 → 1,068 EH/s → Δ = −110.5 EH/s (−9.4% d/d)
2025-12-09: 1,098 → 957 EH/s → Δ = −141.0 EH/s (−12.8% d/d)

This is based on network metrics. The causes cited in the press (shutdowns/closure of farms in Xinjiang) require separate external confirmation, these cannot be proven from the metrics alone.