 About $31 million of USDT tokens were stolen from Tether in November 2017.Later analysis of the Bitcoin distributed ledger showed a close connection between the Tether hack and the January 2015 hack of Bitstamp.In response to the theft, Tether suspended trading, and stated it would roll out new software to implement an emergency "hard fork" in order to render all of the tokens that Tether identified as stolen in the heist untradable.