Your Trophy Score is displayed on the top bar of the screen with a Trophy Icon. This is your overall Multiplayer score which can increase or decrease depending on your performance in an Event.
When an event ends, your trophy score will be updated to reflect the overall points gained or lost in that event.
In all Head-to-Head events, the maximum amount of trophies you can win or lose is 500. For example, if a user gets 1000 points in an event, you can only claim up to 500 trophies.