check this link , you wil get much better understanding
https://medium.com/@EdChain/pow-vs-pos-a-comparison-of-two-blockchain-consensus-algorithms-f3effdae55f5

This is POW coin, you are maybe confused by node rewards, this pool for which they are getting rewards is made by miners, allocating 20% of each mined block for this purpose, 10% each class of nodes.