says its PoA (Proof of Authority):
https://medium.com/ultra-io/ultras-blockchain-is-carbonneutral-certified-edbc41251f87
which is correct?
Both technically, depending on your definition. The validator network is PoA as they are identifiable companies running permissioned nodes. The Ultra Power mechanism follows a DPoS model from the user perspective.
How to stake UOS then?
In the Ultra Platform, after launch.
Yep it's called a consortium Blockchain solution
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