Coinhive, the Java-based web script that uses the hardware of website visitors to mine cryptocurrencies, contributes 1,271 or 1.18 percent of Monero ($XMR) coins mined in a month, according to a study by German RWTH Aachen University. Additionally, the research method discovered that the popular tools for detecting sites running the Coinhive code, such as the NoCoin block lists, are not effective in 82 percent of the cases. Coinhive was created last year with the purpose of providing some income for websites offering free content or services. However, it has been abused by cryptojackers to make profits while crippling the users' computers.