🛡️ Cheats Preventer

DupeGuard | The Ultimate Anti-Dupe for Bedrock

DupeGuard is a powerful anti-cheat addon designed to protect your Minecraft Bedrock server or realm from duplication glitches. It patches 99% of known exploits, ensuring a fair economy and survival experience for all players.

If you want a cheap and extremely good server, check out gravelhost, use my link or the code for 25% off for your purchase. 

• Exploit Protection: Blocks hopper/dispenser loops, bundle glitches, and piston-push exploits.
• Crash Defense: Features "Anti-Crash" protection to prevent items from being duplicated during client disconnects.
• Anti-Rollback: Includes strict inventory sync to stop "Force Quit" and inventory-related glitches.

Server Optimized: Lightweight, lag-free, and works perfectly on 1.21+, Realms, and BDS.

COMMENT HERE, Join the discord (OR EMAIL ME) IF YOU FIND ANY DUPING GLITCH IN-GAME, I PLAN TO MAKE THIS ADDON BLOCK ALL OF THEM!

Stop duplication glitches on your server!

This is the most used glitch on bedrock, and it allows duping of EVERY ITEM, this addon blocks it... COMPLETELY.

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📋 Overview

RIGHT NOW, This addon blocks basically all possible dupes in the game, Including the inventory glitches which some said were not possible to be fixed. if you have this, then there is 99.99999% chance that no one will be able to dupe in your world/realm/server. the 0.00001% doubt is only because sometimes minecraft may get a new glitch that i haven't patched yet.

Cheats Preventer is an addon that automatically blocks common item duplication exploits involving hoppers, bundles, pistons, and client crashes and more. Perfect for survival servers, realms, and multiplayer worlds where you want to maintain a fair economy and gameplay experience, and to prevent cheating in your own world.

The addon works silently in the background—no chat spam, no clutter. Just a subtle warning sound when an exploit is blocked.

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✨ All Checks

🔄 Hopper & Dispenser Loop Prevention

Prevents players from placing hoppers, dispensers, or droppers that face directly into each other. This prevents simple 2-block duplication loops.

• Automatic blocking — The placement is simply cancelled, they can't create the loop.
• No exploits — Players cannot create item loops
• Refunds — The blocked block is dropped back to the player with an alert.

🧱 Piston Push Detection

Detects when pistons are used to push hoppers into illegal configurations and prevents it from running. If a player is able to somehow still place 2 pointing hoppers together like by pushing with piston, this check will not let the duper run.

• Smart scanning — Checks the area around activated pistons, only once, no lag.

🎒 Bundle Dupe Protection

Blocks the bundle-in-container duplication exploit for Hoppers, Dispensers, Droppers, and Auto Crafters.

• Toggleable — Server admins can enable/disable this feature
• Smart tracking — Only monitors containers that players with bundles interact with (Main hand or Offhand)
• Auto-cleanup — Bundles placed in these containers are automatically removed
• No loop, so no lag at all...

💥 Anti-Crash/Disconnect Duplicatoin

Prevents duplication glitches involving dropping items and immediately crashing the game.

• Heuristic Detection — Monitors player stats and detects when items spawn at the exact location of a player who just crashed/disconnected.
• Instant Removal — Any items dropped during a crash are immediately removed to prevent duplication.
• Strict Mode — Customizable via commands.

🔄 Strict Inventory Sync (Anti-Rollback) (fixes the inventory related glitches)

Prevents "Force Quit" or "Kill Client" duplication glitches where inventory items are rolled back to a previous state while duplicated items exist in the world. ITs not possible to dupe items by inventory glitches. let them cry when their yt tutorials no longer work on your server :)

• Inventory Snapshots — Periodically saves player item counts to a secure server database.
• Probation Period — Changes to inventory are only saved after a 15-second safety verification window.
• Auto-Correction — When a player joins, if their inventory contains more items than the server authorized (e.g., from a crash rollback), the surplus is automatically removed.
• Toggleable — Use /cheats:invcheck to enable this strict protection (Recommended!).
• This is not foolable unless a new glitch comes up in the game :)

All in all no dupe is possible with this addon

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🎮 Commands

• /cheats:status (Everyone) — View the current status of all protection features
• /cheats:bundles (Operators) — Toggle bundle-in-container protection on/off
• /cheats:coursedrop (Operators) — Toggle Anti-Crash Drop protection on/off
• /cheats:invcheck (Operators) — Toggle Strict Inventory Sync (Anti-Rollback) on/off

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🔊 Audio Feedback

Instead of spammy chat messages, the addon plays a subtle bass note sound when:

• A loop placement is blocked
• A bundle is removed from a container
• A piston-created loop is destroyed
• An inventory rollback occurs

This lets players know something happened without cluttering the chat and it keeps it unnoticeable.

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📦 Installation

1. Download the behavior pack
2. Apply it to your world or server/realm
3. That's it! Protection is automatic

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⚙️ Requirements

• Minecraft Bedrock Edition 1.21.130+
• NO need for beta-apis/experiments.

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🤔 FAQ

• Q: Will this affect normal hopper usage?
  • A: No! Regular hoppers, hopper chains, and item sorters and all other related things work perfectly fine. Only illegal configurations are blocked. 
• Q: Does this work on Realms?
  • A: Yes!
• Q: Can players bypass this?
  • A: The addon covers all major exploit methods (Hoppers, Bundles, Crash Dupes, Rollbacks, save and quit dupes etc), making it nearly impossible to bypass.
• Q: Is bundle blocking on by default?
  • A: Yes, but operators can toggle it off with /cheats:bundles if needed.

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Icon from: "https://www.flaticon.com/free-icons/duplication" modified by me.

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 Part of the Survival Essentials collection by Areed.