Each UNICOIN is backed by Hive, HP and some small swap.hive holdings

In what kind of ratio, can you be more specific?

New tokens will only be minted if they are backed (mostly backed by HP)

"Mostly..." When you are asking for people's money you have to be more exact. When terminology is as loose as this I believe it can allow or potentially cater for deception.

Finally, on the buying upvotes part.

Upvotes are not guaranteed

Is the curation manual? How do you ensure that upvotes just don't go automatically out to the top ten people that satisfy the criteria? This would in effect render it a vote buying and self voting service.

Please don't take my questions the wrong way but Hive has had many rugpulls and Honest John's sweatily swearing they are legit before run off. So I feel it is important to be specific and clear on what you are offering.