SPT token is one of the popular token among the splinterlands players. And when you blog about the splinterlands, you earn this token. I have written blog on how this token works, do give it a read if you want :) Check out the article: https://hive.blog/hive-167922/@esmeesmith/spt-token-how-does-spt-token-work https://leofinance.io/@esmeesmith/spt-token-how-does-spt-token-work
But the token does nothing all you can do is collect it lol