Cryptocurrency mining represents 0.1% of electricity generation worldwide. This consumption, evolving with the rate of the virtual currency (bitcoin, ether...), follows a growing trend in regions of the world where connectivity is high and electricity is cheap. For example, in Quebec, one-third of electricity generation was absorbed by cryptocurrency mining activity in 2017. The Francophone province has had to temporarily suspend the mining activity and is therefore considering increasing its electricity tariffs. Energy efficiency has thus become the new economic issue for miners. Currently, several technological innovations are making it possible to considerably reduce the level of energy consumption, such as more efficient cooling of data processing centres or, in terms of mining equipment, the transition from CPU processors to GPU graphics cards, which consume less electricity!