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anyway, hashnest provides a cheap BTC cloud mining scheme. But it will make a cheap plan much better if their service is improved: e.g. use real hashrate instead of faking, improve the poor English, and answer the support damn support request (I submitted a request on September 3, and until now it is still "solving"!!!)
All we can do - is wait, and hope for the best 
But main problem for me - is the Traiding interface. It's horrible compare to CEX.io.
I hope when they open trades, they will rebuild it
p.s
Finally 5min and 15min values comes to normal.
who knows if it is really back to "normal"~~~
probably they save the money to hire a programmer and an interface designer, and thus lowers the mining cost
