P.S.A Do not try and deposit siacoin sc funds into Poloniex. I linked my Poloniex account with my a3 back in January when I received the unit. There were 4 separate deposits made during the first 2 days, totaling 2,500 SC. Here's a screenshot I took this morning, still no coins even though siamining.com has it as completed as well as all other transactions that I since switched over to hitbtc. No issues whatsoever with Hitbtc. I sent Poloniex support a message about it on the 30th of January, giving them 2 days to complete the trx before opening a ticket. As of today Feb 13th 2018, I still have received no correspondacnce, and have no idea where my 2500 SC are as of right now.
TLDR - Deposited 2500 Siacoin into Poloniex from siamining.com and still have not received them. Switched to Hitbtc, and no issues there.
Been lurking for quite sometime now, thought I'd give back and hopefully save someone from this happening to them.
Cheers Miners