Tell us a fact about one of your favorite cryptocurrency

Hello friends! Since i joined this sub i learned a lot from you people. In this discussion i would like you to share with us something about a cryptocurrency that you might find interesting, useful, less known or whatever you think it's worth mentioning really.

There are a lot of interesting and unique projects and i think it could be useful to learn a thing or two about them.

I will start:

Did you know that around 4 million bitcoin out of the 21 million that will ever exist are lost forever?