What is $trac used for in the OriginTrail ecosystem?

Could you elaborate on the role and utilization of $trac within the OriginTrail ecosystem? As a cryptocurrency and finance practitioner, I'm interested in understanding how this token powers the network and what specific functions or services it enables. Does it serve as a utility token for transactions, governance, staking, or some other purpose? Clarifying its use cases would greatly assist in grasping the full scope of its significance within the OriginTrail platform.