AntiDupeSecure

SecureInventories is a lightweight but powerful inventory integrity & anti-duplication plugin for Paper servers.

It detects suspicious item creation by combining inventory snapshots, conservation rules, and optional Item UID (Item ID) duplication checks — without NMS, exploits, or invasive hooks.

Designed for modern Paper (1.21+) servers that want low false positives, clear staff visibility, and configurable enforcement.

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Core Features
Inventory Session Protection

• Takes snapshots on container open and validates changes on close
  
• Detects unexplained inventory gains
  
• Optional conservation rule credits items legitimately taken from containers

Item UID (“Item ID”) Duplication Detection

• Items are tagged with a unique UID using Bukkit PersistentDataContainer
  
• Detects when the same item ID appears more than once
  
• Optional actions:
  • Flag
  • Remove duplicates
  • Rollback
  • Rollback + Kick

Shulker-Aware Detection (Optional)

• Counts items inside shulker boxes
• Optionally scans ender chest shulkers
• Prevents hiding duped items in containers

Monitor Mode + Strikes

• Flagged players enter temporary stricter monitoring
• Strike system with decay
• Optional auto-quarantine workflow for staff review

Staff-Friendly

• Clean console logs
• Permission-based staff alerts
• Optional file logging
• Optional Discord webhook notifications

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⚙️ Commands

/secureinventories status
/secureinventories reload
/secureinventories inspect <player>
/secureinventories pardon <player|uuid>
/secureinventories rollback <player> [last]
/secureinventories quarantine <player>
/secureinventories unquarantine <player>

Aliases: /si, /antidupe
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Permissions

secureinventories.admin # Full access (default: OP)
secureinventories.alert # Receives staff alerts
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Compatibility

Server software: Paper
Minecraft versions: 1.21+
Java: 21
No NMS
No external dependencies
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Spigot-Safe Changelog
Version 1.3.1

• Added detailed, fully documented configuration
• Improved Item UID (“Item ID”) duplication detection
• Expanded comments and tuning guidance
• Minor internal cleanup and clarity improvements

Version 1.3.0

• Added Item UID duplication detection
• Added duplicate-ID handling actions
• Added shulker deep scanning support
• Added strikes and monitor mode enhancements

Version 1.2.0

• Conservation-based inventory ledger
• Accurate per-material delta detection
• Staff alerts and rollback support