ItemCheck [1.20 - 1.21] icon

ItemCheck [1.20 - 1.21] -----

Anti-dupe with NBT fingerprinting and packet analysis protection.

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1.4 MB .jar


Update v1.1.8
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
----------, Apr 22, 2026
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Resource Information
Author:
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Total Downloads: 187
First Release: Sep 25, 2025
Last Update: May 16, 2026
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All-Time Rating:
4 ratings
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