On January 7, 2020, there was an attempted hack by way of the user registration system. For a very quick explanation of how this attack attempted, please see:

https://www.xkcd.com/327/
Needless to say, the attack was not successful. However, there has been a very steep rise in these kinds of attacks lately, and so I'm shutting down the user registration system until I can get a handle on it. That should take about 2-3 days.
If anyone has any questions, please feel free to ask them.
