Whenever I deployed my Ethereum test net, I usually typed 'genesis.json' from the example code.
In this point, all I want to know is the difference between difficulty and mix hash.
I know that difficulty is a value corresponding to the difficulty level applied during the nonce discovering of this block.
but, I think that If mix hash is low value, calculation finding a target value is more difficult.
So, I conclude myself.
difficulty is personally. (each miner's difficulty) mix hash is network difficulty. (not personally)
it is right?