Bitcoin’s mining difficulty has fallen below its year-earlier level for only the second time in the network’s history as weak mining economics and the shift toward artificial intelligence weigh on capacity growth.The metric, which measures how difficult it is to mine a Bitcoin block, is now at 126.23 trillion after falling 0.74%, about 1.1% below the 127.62 trillion reached a year earlier and 19.1% from the 155.97 trillion all-time high seen in November 2025.Difficulty adjusts every 2,016 blocks, or roughly every two weeks, to keep Bitcoin’s average block time near 10 minutes. Falling difficulty indicates that less computing power was…

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