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Anti-Dupe Pack

A simple Anti-Dupe for Worlds, Realms and Servers. Stops the Join-Leave Dupe, Grass-Piston and Bundle Methods entirely. Works with normal/custom items, any stack size, and does not require Beta API - includes alerts/logs, and an administrator menu.
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Anti-Dupe V3 1.21.90+

ByShadowFrazer
  • R
  • Jul 13, 2025
  • 2.94 KB
  • 2.4K
  • 1.21.93+1

File Name

Anti-Dupe V3.mcpack

Supported Versions

  • 1.21.93
  • 1.21.90

Version 2.0.0 – Tall Grass / Piston Dupe Patch

  • Added protection against the "Tall Grass" duplication exploit.

  • Blocks all duplication attempts involving two-block-high plants.

  • Automatically removes pistons used in the exploit setup.

  • Publicly announces the player caught attempting the dupe, along with the plant involved.

Version 3.0.0 – Bundle Dupe Patch

  • Implemented detection and prevention of duplication using Bundles.

  • Identifies the player and specific Bundle variant used, displaying this in chat.

  • Automatically clears Bundles from any Hopper inventories associated with the attempt.