Seasonal HiScores/Rewards

There are three rewards that you receive from winning a Seasonal Hiscores competition. A Crown of Supremacy which eventually becomes a Crown of Legends, a new emote called Round of Applause, and a title corresponding to the competition that you won.

Crown of Supremacy
After winning, the Crown of Supremacy becomes available in your Interfaces tab. It is a cosmetic override which means that it is not a phyiscal item, and therefore can not be equipped. You are only able to wear crown for as long as long you remain as rank one on the most recent competition. After that, the lose the cosmetic override and instead get the Crown of Legends overrride. They look extremely similar.

Round of Applause
The Round of Applause emote will not show up for most people on their emotes tab, it will only show up for the people that have won the competition.

Titles
The title that you unlock, corresponds with the competition that you won. Only one title known at the moment because only one competition has concluded.