Cryptojacking describes the creation of cryptocurrencies by a website that executes background mining software on a visitor’s computer. Since mining is a very computing-intensive process, this can lead to reduced battery life on mobile devices. The cryptojacked computer runs at full speed, the battery drains quickly, and the profit goes to the attackers. The St. Pölten UAS has now developed the free app CoinEater, which recognises online crypto mining and blocks its execution.