Bad news for Sib holder.. Abra announced earlier that they ceased supporting Sib..since their custody partner Bittrex no longer support this assets for users.. There's nothing Abra can do but to remove this coins on their lists. The grace period to withdraw or exchange is until April 15th failure to do so will risk of losing funds.. That kinda sucks especially to those (whales)who wrongly put their assets in one basket..