Can't help you with the info, sorry, just letting you know I actually liked that "coinhive mining captcha". You just wait few more seconds and it is done. (and I can even brag I was mining monero lol).
With the regular captcha I tend to get into trouble, needing to re-do it sometimes several times.
If "coinhive mining captcha" solved current Tor problem, I would go back to it.
P.s.
Thanks for doing this Faucet. I got today a little over 0.2GRC yay :-)
The same for me. Coinhive captcha is more convenient to solve than the google reCaptcha thing..
But many members of the community raised their concern, so I removed it.