What is PoS minting difficulty?

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1

What is the purpose of PoS minting difficulty? How is it calculated? How does it factor into the minting block selection?

2

The PoS difficulty relates to the target per coin day. Just like the PoW difficulty relates to the PoW target.

To find a block you need:

hashProofOfStake < CoinDayWeight * TargetPerCoinDay
3

here is a wiki how difficulty is calculated. Keep in mind that peercoin is a fork of bitcoin: https://en.bitcoin.it/wiki/Difficulty

The key difference between mining and minting is using a nonce and a timestamp. Thats it. A nonce is a random number you can generate millions per second while a timestamp just once a second.