VoidAuth

Until a player authenticates, VoidAuth holds the client in place: keyboard and mouse input are frozen, and the server sends a position lock packet that keeps the client at the server-given coordinates with zero velocity and no gravity. Render interpolation is locked as well, so a locked player does not drift or show flickering. Movement packets, including vehicle movement, are intercepted on the server, which closes the gap that older login mods left open when they only blocked packets on one side.

Players join and type a register or login command, and a help command lists the available commands in a clickable form. Passwords are checked for length in UTF-8 bytes, rejected above 72 bytes, and screened for simple letter and digit patterns, including ascending and descending sequences such as abc 123 or cba 321. A grace period setting, flightCheckGracePeriodSeconds, suppresses flight checks after login so a player still falling or gliding with elytra is not kicked, and the server loads a 7×7 chunk area around a joining player. Death state is recorded at logout and respawn runs automatically on rejoin.