SIGN perpetual contract is about to be launched SIGNUSDT contract trading opening time: 7:30pm on April 28th (UTC+8) Sign is the infrastructure for on chain verification, enabling legal identities, digital contracts, token ownership, and other digital information to be verified across borders by governments, financial institutions, and individuals. Sign's main revenue generating product, TokenTable, supports core functions of the crypto economy, such as token airdrops, unlocking, and over-the-counter trading.