As we all know that Tether was attacked, here is the official statement released by Tether team.
"Yesterday, It is discovered that funds were improperly removed from the Tether treasury wallet through malicious action by an external attacker. Tether integrators must take immediate action, as discussed below, to prevent further ecosystem disruption.$30,950,010 USDT was removed from the Tether Treasury wallet on November 19, 2017 and sent to an unauthorized bitcoin address. As Tether is the issuer of the USDT managed asset, they will not redeem any of the stolen tokens, and they are in the process of attempting token recovery to prevent them from entering the broader ecosystem.
The attacker is holding funds in the following address: 16tg2RJuEPtZooy18Wxn2me2RhUdC94N7r. If you receive any USDT tokens from the above address, or from any downstream address that receives these tokens, do not accept them, as they have been flagged and will not be redeemable by Tether for USD. The following steps have been taken to address this matter:
Tether issuances have not been affected by this attack, and all Tether tokens remain fully backed by assets in the Tether reserve. The only tokens that will not be redeemed are the ones that were stolen from Tether treasury yesterday. Those tokens will be returned to treasury once the Omni Layer protocol enhancements are in place. We will provide further updates as they come available, and we appreciate the community’s patience, understanding, and support while we work to rectify the situation in the best possible manner to everyone’s benefit.
The Tether Team "
The original announcement can be found at: https://tether.to/tether-critical-announcement/
Calling @originalworks to verify.