ItemCheck v1.1.9

Anti-dupe with NBT fingerprinting and packet analysis protection.
New
  • Added MySQL support - keep your data in a database instead of a local file
  • The plugin is now fully translated, so menus and messages match the language you pick
  • Added a Quick Actions menu in player profiles - toggle trust, clear flags, scan or kick in one click
Improvements
  • Cleaned up the player inventory view - hotbar sits at the bottom like a real inventory
  • Clicking an item in a player's inventory now shows its full details
Fixes
  • Fixed translations not showing up in menus and messages
  • Fixed menus misbehaving after switching language
Fixes
  • Fixed a duplication bug that could happen when picking items up with a nearly-full inventory
  • Fixed items sometimes losing their tracking ID after being dropped and picked back up
  • Fixed ghost items appearing in the inventory after a blocked pickup, move, or craft
  • Fixed stacked items losing their IDs when merged by hand or shift-click
  • Fixed mass scan (/antidupe scan all) causing lag and occasional crashes on busy servers
  • Fixed batch scan sometimes corrupting item data
Compatibility
  • Now runs cleanly on 1.20 through 1.21.x+
Performance
  • Improved pickup and stacking performance
  • Reduced memory usage during long sessions
  • Scans moved to a safer execution path to prevent server hitches
Detection Settings
  • Fixed Grace Period settings not saving to config
  • Fixed all settings not updating display after changes
  • Fixed settings using stale values instead of reading from config
  • Debug mode now properly saves to config
Transaction History
  • Fixed filter system (ALL, TRADE, CRAFT, DROP, PICKUP) not working
  • Filters now properly display filtered transactions
  • Active filter now shows with green highlight
Player Management
  • Fixed search player feature not capturing chat input
  • Search now properly opens player profiles
Item Stacking System
  • Fixed tracked items not stacking in inventory
  • Fixed dropped items not merging on ground
  • Manual stack merging now works with left/right-click
  • Shift-click stacking properly combines item IDs
  • Items from different slots now stack correctly
  • Fixed: Dropping Item would not stack with tracked items
  • Added: Full 1.20.x - 1.21.x server support
  • Added: Automatic SpigotMC update checker
  • Added: /antidupe version command for compatibility info
- Fixed: Items weren't stacking due to anti-dupe tracking keys interfering with stack merge detection
Particle Effects
- Added Visual particle effects now appear on flagged items during scans
- Added Three severity levels: Low (green), Medium (orange), High (red)
- Added Toggle on/off in Detection Settings GUI
- Added Configurable particle types in config.yml

Detection Weights Customization
- New GUI to customize confidence weights for all 17 detection types
- Fine-tune detection accuracy per flag type (0.00 to 1.00)
- Adjustable in increments of +0.05 or +0.10 (shift-click)
Fixed an issue where items would stop stacking after the grace period ended
EULA: Free EULA
1,042 Views
66 Downloads
Oct 2, 2025 Published
May 16, 2026 Updated
Not yet rated
1.4 MB File size
Open source
  1. No
DRM-free
  1. Yes
Unobfuscated
  1. Yes
Type
  1. Protection
  1. Anticheat
  1. Optimization
Game mode
  1. Survival
  1. Factions
  1. Prison
Supported software
  1. Bukkit
  1. Spigot
  1. Paper
Supported versions
  1. 1.21.11
  1. 1.21.8
  1. 1.21.5
  1. 1.21.4
  1. 1.21.2
  1. 1.21
  1. 1.20
Supported languages
  1. English
  1. Spanish
  1. Russian
  1. Chinese
  1. Japanese
Creator
Owner
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1,042 Views
66 Downloads
Oct 2, 2025 Published
May 16, 2026 Updated
Not yet rated
1.4 MB File size
Open source
  1. No
DRM-free
  1. Yes
Unobfuscated
  1. Yes
Type
  1. Protection
  1. Anticheat
  1. Optimization
Game mode
  1. Survival
  1. Factions
  1. Prison
Supported software
  1. Bukkit
  1. Spigot
  1. Paper
Supported versions
  1. 1.21.11
  1. 1.21.8
  1. 1.21.5
  1. 1.21.4
  1. 1.21.2
  1. 1.21
  1. 1.20
Supported languages
  1. English
  1. Spanish
  1. Russian
  1. Chinese
  1. Japanese
Creator
Owner
Recommended for you
#1 BuiltByBit Plugin ~ Protects your server from crash packet exploits ~ Folia Support
5.00 star(s) 141 ratings
4,195 purchases
Create items, blocks, mobs, emojis, and more with automatic resourcepack generation!
5.00 star(s) 53 ratings
3,148 purchases
Protect your server from crash/dupe/packet exploits with the ultimate security fix plugin.
5.00 star(s) 44 ratings
3,084 purchases
High Performance | Customizable | Cross-Version | GeyserMC | Folia Support
4.50 star(s) 71 ratings
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All-in-one dungeon creator. Create unlimited, timed dungeon experiences with your own builds
4.50 star(s) 72 ratings
2,578 purchases
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