I discovered unusually low payout mining ETC and did some investigation on the matter.
From what I can see if you mine ETC you will be earning roughly
HALF of what you should on average against the difficulty. I will provide some examples
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Nano is reputable pool so they should be a good benchmark to use.
using this account as example
http://etc.nanopool.org/account/0x77b5f7633313bec7dba42c63ca2f22afd179791a#workersTab1558 MH for the average over 6 hours (time of this writing)
23.25 ETC per day shown
but if you calculate against the difficulty of 15.059 TH you should earn 44.69 ETC per day average
You can check it at
https://www.whattomine.com/coins/162-etc-ethash?utf8=%E2%9C%93&hr=1558&br=5.0&d=15051273568360.0&p=220.0&fee=0.0&er=0.00501003&cost=0.1&hcost=0.0&btc=537.002&commit=Calculate---------------
The stats on nano appear to be accurate, at first I ignored them as I thought it was just incorrect. But after some payouts they matched up to the charts they predict you will earn over a certain amount of time. So I went back to mining ETH and I earn as I should, given the difficulty.
So what do you guys think is happening here? Is a 51% attack making blocks invalid or is it some other issue? I doubt the pools are doing something shady as nano has been reliable.
Edit: Only nano was affected, they have resolved the issue and made back payments for the missing funds.