Monument
Secure device-linked authentication for offline and private Minecraft servers.
About
This mod is currently in BETA testing state! Please visit the Wiki for more information!
Monument adds secure, account-based authentication to Minecraft servers — even in offline mode. Instead of trusting just a username, Monument links each player to a verified Monument account and device, using modern cryptography (Ed25519 signatures, short-lived join tokens, and server-bound validation). This prevents username spoofing, unauthorized access, and common offline-mode exploits while keeping the login process smooth for legitimate players.
Players authenticate once through the Monument web portal, link their device, and from then on can join normally. The server verifies every login locally using signed JWT join tokens and server-specific validation, with no Mojang dependency required. Monument is designed for private communities, modded servers, LAN environments, and any setup where security matters but online-mode isn’t viable.
Visit Monument Mod Portal for registration.
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