And yes! It's time for me to setup more miners! 25 Mh/s not cutting it anymore
"Earning interest" are coins that are RIGHT THIS VERY MOMENT staking for interest.
That difficulty has nothing to do with mining. It has to do with staking.
Oh, so its supposed to be 0? Little confusing. I've never seen it move from 0, but I have earned interest, seems like a useless statistic if it only moves from 0 for a quick moment?
When it moves from zero it lasts until the interest payment has confirmed, which can take hours, so it's not usually a quick moment.