It turns out that they have 2 types of tokens? And what are they used for?
I was at first confused with this too. It seems like the UCC token is used inside the system as a reward, and the UNS token is to use for exchange trading
And how can I earn UCC tokens?
You need to participate in their bug bounty program. Then you will become a "hunter" and you will be looking for vulnerabilities in the systems with other "hunters". Frankly, I cannot say exactly how much you will get for it