It's a temporary decision to sign a cert by myself, just not to mess with LetsEncrypt (it's kind of weird, like all free stuff). SSL isn't needed here, I will remove it. It's a part of a BIP39 web wallet development, sorry for the inconvenience.
It's all good. We have a lot of work ahead of us. 2019 will be another amazing year!

Crypto-city.com will be undergoing a massive site-wide update in the very near future that will vastly improve the scalability, performance and usability of the site.
https://www.crypto-city.com