What is coin hive virus?

This is neither a virus nor a trojan, and it does not make the site unsafe to visit in any way whatsoever. Your antivirus package is crying wolf.

Coinhive is a cryptocurrency miner written in Javascript, which sends any coins mined by the browser to the owner of the web site.

Some users find this script annoying and inappropriate, as it will increase CPU usage (and, hence, power consumption) on your web browser while you have the web site open. However, this will end as soon as you leave the site.

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