Ctp is the tribe token from ctptalk.com

If you add the tag ctp to your posts, then your posts will appear on the feed in ctptalk.com and you will earn some ctp along with your hive rewards.

You can do the same with palnet, neoxian, archon and other tribes. This will make sure you start earning their tokens as well and then you receive them in your hive-engine.com wallet.