If your old SC is on Bittrex, you'd better get it out soon.  We've dropped them because they would not update to our new ticker SILK.  As far as I know all previous SC is still accounted for on our wallet; however, there will be a fork coming soon as we implement our new POS staking.  The community has unanimously decided to stake at 111%.  I recommend moving your SILK (old SC) to the latest wallet client.