Re: Nothing-at-Stake & Long Range Attack on Proof-of-Stake (Consensus Research)
You weren't frothing at the mouth in your post so there is no reason why anyone else should be 
and you seem genuinely interested so the following applies to Nxt POS
Longest chain rule with highest difficulty applies in Nxt too. ...
and you seem genuinely interested so the following applies to Nxt POSLongest chain rule with highest difficulty applies in Nxt too. ...
Please explain to me difficulty in POS?
TL;DR cumulative difficulty is higher the larger the total amount of stake that forged the chain
More information:
Formula see here: https://wiki.nxtcrypto.org/wiki/Whitepaper:Nxt#Cumulative_Difficulty
"A cumulative difficulty value is stored as a parameter in each block, and each subsequent block derives its new difficulty from the previous blocks value. In case of ambiguity, the network achieves consensus by selecting the block or chain fragment with the highest cumulative difficulty."
"In Nxt higher difficulty of a branch means that this particular branch was forged by owners of a larger amount of coins."
(Come-from-Beyond)