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Everyone does not have the same mana. 1 KOIN has 1 Mana. So if you have 100 KOIN, you have 100 Mana.

so it is kinda like HP but you don't have to stake. Thanks

Yup. Mana is an evolution of the RC system that underpins Hive which was written by Michael (one of the architects of Koinos). The main difference is that you don't have to stake in order to use the blockchain and Koinos is a general purpose blockchain.