There is an pretty complete description about POS and how the weight is calculated in the Bitcoin wiki. Have no idea if the XC implementation matches this design but it should be a nice base.
https://en.bitcoin.it/wiki/Proof_of_StakeThanks kimmy
But it still does not explain how the network weight is calculated.....
True, thats where i also starts asuming things, like the network weight is the combined weight of all addresses with a balance.
Guess we have to wait for the team to answer this 'in between' or publish the paper about the innerworkings of XC.
But for me its just curiosity, the only real answer i needed was: coins stake 3.3% a year. Based on my own wallet observations this is working like a charm.