Bitcoin mining difficulty reaches 148.2T; next reset expected around January 8, 2026
On December 29, 2025, Bitcoin's mining difficulty climbed to 148.2 trillion in the latest 2025 adjustment, marking the highest level since major miner disputes. The next recalibration is expected around January 8, 2026, and analysts say difficulty could exceed 149 trillion if elevated hash power persists. Smaller operators face tighter margins as costs rise.