In the official whitepaper, Pax Gold CEO Charles Cascarilla explains that the PAXG protocol is created entirely on the [Ethereum] blockchain and is secured by the proof-of-work ([PoW]) model. However, PAXG is not exclusively tied to Ethereum and can be launched on other blockchains as well.
Proof-of-work protocols represent a classic approach to cryptocurrency mining, [Bitcoin] being the most prominent example. Ethereum has, however, recently begun its transition to the proof-of-stake ([PoS]) model, aiming to reduce the resources necessary for token mining, among other things.