Bitcoin Mining Difficulty Ends 2025 at Record 148.2T, Further Increase Seen in January 2026

On 29 December 2025, Bitcoin's final difficulty adjustment of the year lifted the metric to about 148.2 trillion, setting a new all-time high. With average block times currently running slightly under the 10-minute target, another increase toward 149 trillion is projected for early January 2026, reinforcing network security while raising operational pressure on miners.