KairoAuthentication
About
A production-ready authentication plugin for offline-mode Paper servers supporting both premium and cracked players. Features async Mojang API premium detection, PBKDF2 password hashing with salt, per-IP account limits, configurable login timeout with blindness/freeze restrictions, and a built-in PvP combat tagging system with ender pearl cooldowns. Premium players authenticate instantly; cracked players register/login via commands.