It's probably just variance as the nethash calculations are just based on the timing between blocks and are just an estimate.
Hadn't considered that. Doesn't it take like 24 hours or so for the net hash/difficulty to catch up w/ the actual hash rate?
Is all this hash rate new?
Edit:
I love the charts on the website.
Seems like the good doctor has picked up the interest of a large friend, looking at the chart, you're correct, we're dealing with both variance and a surge in hashrate within the last day:
http://boolberry.com/state.html
Hope they're looking to hold!
I'm not so sure it's just variance. I wrote a script for monero that xnbya runs with some modifications here (
http://minexmr.com/pools.html ), and in my experience it's not sometimes, it is all the time that the sum of the known pools hashrates adds up to be 20-33% larger than the hashrate calculated from the diff. I think the diff is based on last 24 hours, and the pools base their hashrate on the diff of blocks over the last 10 or 30 minutes. Maybe I'm wrong, but if it was just variance in the hashrate, then at some point the calculated network hashrate would be higher than the sum of the pools (since this isn't even including unknown/private pools and solo miners), but in my experience this is never true - the sum of the known pools is always greater than the calculated network hashrate. I don't know why this would be, just an observation from monero that also seems to hold true for boolberry and bytecoin.