Overstock.com's security token trading platform, tZERO, went live Thursday, Jan. 24, 2019. As of now, tZERO's own security token is the only available token. Investors can sign up via 'introducing' broker Dinosaur Financial Group, LLC. tZERO's launch has been years in the making and was funded by a months long token sale ending in August 2018 which raised $134 million.