Bitcoin mining difficulty is down 3.6%, following a winter storm that led a number of miners to power down.

Difficulty refers to the complexity of the computational process behind mining, and it adjusts roughly every two weeks (or every 2,016 blocks) based on the average block time.

The estimated global network hashrate fell from 245 EH/s after the last update down to 222 EH/s last Wednesday and back up to 256 EH/s, according to data from The Block.

Meanwhile, revenues went up by a slight 0.9% month-over-month in December, with miners bringing in a combined $476.7 million.

Most bitcoin mining revenues came from the block reward subsidy ($467.34 million) and only a small portion from transaction fees ($9.31 million). Bitcoin's transaction fees as a share of total miner revenue decreased to around 2%.

Bitcoin miners generated about 5.9 times the revenues of Ethereum stakers in December.