Good move. Indorse will need a lot of promotions like this to get users. I am not expecting a lot of (crypto) users to just give a (to them) 'random blockchain startup' all sorts of info without something to entice them :-)
Good luck, I hope you guys gain a lot of users through this.
p.s. I only stumbled upon this competition by pure coincidence, might want to look for ways to make people actually notice you a bit more.