Extending November’s own 48% increase, miner revenues continued to soar as bitcoin (BTC, -13.21%) rallied over 300% last year, briefly trading above $29,000 for the first time ever on New Year’s Eve. 

Revenue estimates assume miners sell their BTC immediately.

Measured by per terahash per second (TH/s), miner revenues nearly tripled in the past three months, reaching $0.284 Thursday, per data from Luxor Technologies, its highest level since August 2019, as CoinDesk previously reported. 

Network fees brought in $68.3 million in December, or nearly 10% of total revenue, a slight percentage decrease from the 10.5% of revenue represented by fees in November. 

Fees were quite volatile in December, bouncing between $4 to all the way to above $12 throughout the month, per Coin Metrics. 

Notably, fees as a percentage of total revenue continues a strong upward trend since April, prior to the network’s third-ever block subsidy halving in May. Increases in fee revenue are important to sustain the network’s security as the subsidy decreases every four years.

Taking advantage of the revenue increase, miners are bringing more machines online, pushing the network’s difficulty to record highs after Saturday’s adjustment. 

What’s more, miners have ordered so many new machines to capitalize on the period of increased profitability that leading manufacturer Bitmain, for example, has sold out until August even after nearly doubling the price of some models. 

As heavyweight investors offer six-digit price predictions for bitcoin amid its ongoing parabolic rally, miners eye continued revenue growth through early 2021 and beyond.