On the night of Wednesday, December 19, the difficulty of mining Bitcoin fell by 9.5%, which increased the profitability of mining the cryptocurrency.

Thus, according to BitCluster's development director Dmitry Shuvaev, at the moment a single Antminer s9 device with a hashrate of 14 TH/s, at a bitcoin price of $3700, brings three times more profit with monthly costs of 3700 rubles (about $55).

"With the upward trend in the bitcoin exchange rate that we have been observing since the start of the week, or with the current bitcoin value staying around $3700, mining profitability now stands at 35-42 % of monthly revenue," Shuvaev added.

At the beginning of winter, the mining difficulty of Bitcoin underwent the second largest drop in its entire history — by 15%.

On December 10, BitMEX analysts stated that since November the hashrate of the bitcoin network had fallen by approximately 31% along with the sharp drop in the price of the first cryptocurrency. Over the past month and a half, about 1.3 million Bitmain S9 mining devices have been shut down.