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I wonder why they didn't choose SIA? SC was silkcoin and we're no longer supporting 2 letter symbols on Bittrex which is why Steem Dollar trades as SBD.

Why aren't you adding two-letter symbols for coins? It's arbitrary and will cause confusion for coins that trade with two on other exchanges. Might as well go with it.

Is the above mentioned account even a verified account to the bittrex owner/staff?

Could be anyone for all we know according to his post history.