I can confirm that one of the premium pools is a scam, I mined at smc.hash.so for 2.5 hours at 5 m/h, today I have a total of 0.00000000 coins confirmed/unconfirmed there, never got one satoshi of s coin, THAT IS A SCAM POOL!!!!!!!!!!!!!
Check what coin you was digging .... you must select coin. Some one report that dig not SMC but something else.