|Coin Proof||Proof of Stake|
The architecture of the next-generation NXT platform, NXT 2.0 [Ardor], will take the [NXT] system further, provide scalability, make it even more flexible, yet preserve its security and stability.
The fundamental concept of the NXT 2.0 design is a clean separation of "forging token" and "transactional token". Currently, it is the NXT coin that serves this dual purpose, being used both to determine forging stake, i.e. the right of an account to generate blocks, and to execute all kinds of value-transfer transactions, i.e. represent unit of value.
A separation of these two functions is what we believe can achieve both much greater scalability, by reducing blockchain bloat, and flexibility, by allowing multiple other transactional tokens to be used, in effect allowing custom "child chains" to exist and run on the same network of nodes. - source