Since 7 days is short to be listed by google, I hurried to write my entry to this contest ;-)
I have optimized it for the keywords: "earn cryptocurrency" and also for a long tail keyword "Earn cryptocurrency for consuming content". I think that the objective is to bring people to hive and I believe it will be easier to do so using long tail keywords because the competition is smaller on them.
It could be too short, but I had a post listed in a day and saw others the same.
Thank you for submitting an entry, I hope it finds it's way into the search!