Other Pos Minting...NXT

How does say NXT and others wall handle pos in realtion to

Cold minting or equivalent
Check pointing

AFAIK NXT does not use check-pointing???

NXT does not have “cold-locked” minting. NXT also does not use checkpoints.

NXT has a “reorg prohibition” that protects it from the Nothing at Stake attack. Like Peerchemist said, there are no centrally broadcasted checkpoints (only the regular checkpoints delivered with software updates).

But it has a similar mechanism to Cold locked minting called “Leased forging”. But you only get transaction fees while “forging”, and there is no protection against “stake pools”, like intended in sigmike’s cold minting design.

how about NEM POI, how do the protect or not?