In the context of GST, EVC stands for Electronic Verification Code. It is a method of user authentication on the GST portal, which authenticates the identity of the user by generating a One-time Password (OTP) . The OTP is sent to the registered mobile number of the authorized signatory at the time of GST registration. EVC is one of three methods by which user authentication is done on the GST portal, the other two being DSC and e-Sign. While DSCs are issued by DSC certifying authorities only and can be obtained through them, e-Sign and EVC are methods that enable users to affix their signature digitally on forms filed on websites such as the GST Portal.