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Anti-Dupe

Anti-Dupe

A security tool for Minecraft servers, designed to prevent item duplication exploits.

31.2Kdownloads
42followers
31.2Kdownloads
42followers

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Details

Licensed ARR
Published 3 years ago
Updated last month
All versions

3.1

Release
Anti-Dupe 3.13 months ago 61
Download

Compatibility

Minecraft: Java Edition
26.2
26.1.x
1.21.x
Platforms
Bukkit
Paper
Purpur
Spigot

Changes

Anti-Dupe 3.1 — Hybrid Deep Scanner

Overview

Anti-Dupe 3.1 uses a hybrid detection system combining:

  • Immediate event-based verification
  • Periodic inventory audits
  • Ender Chest scanning
  • Loaded container scanning
  • Cross-inventory UUID checks
  • Ledger integrity audits
  • Optional deep scans
  • Automatic chunk-load scans
  • Safe recovery backups
  • Daily log files
  • Discord webhook alerts
  • Multi-language support
  • Admin whitelist
  • Original item preservation
  • Stack-safe accounting
  • SQLite transaction ledger

Scanner Configuration

scanner:
  enabled: true

  online-inventory-minutes: 5
  ender-chest-minutes: 10
  loaded-containers-minutes: 15
  uuid-crosscheck-minutes: 15
  ledger-audit-minutes: 30

  players-per-batch: 10

  automatic-chunk-scans: true
  chunk-scan-delay-ticks: 20

Scanner tasks are staggered to prevent lag spikes.

Scan Frequency

Scan Default
Online Player Inventories Every 5 minutes
Online Player Ender Chests Every 10 minutes
Loaded Containers Every 15 minutes
Cross Inventory UUID Check Every 15 minutes
Ledger Integrity Audit Every 30 minutes

Player scans are processed in configurable batches.

Immediate Event Verification

Immediately verifies all inventory transactions after Minecraft completes them.

Protected events include:

  • Inventory Click
  • Shift Click
  • Number Key Swap
  • Drag Distribution
  • Stack Split
  • Stack Merge
  • Double Click Collect
  • Offhand Swap
  • Hopper Transfer
  • Item Pickup
  • Item Drop
  • Crafting
  • Smithing
  • Anvil
  • Grindstone
  • Villager Trading
  • Player Login
  • Player Logout
  • Container Open
  • Container Close

Cursor items are included in every transaction snapshot preventing false positives during normal stack splitting.

Deep Scan Commands

Scan everything:

/antidupe scan all

Scans:

  • Online Players
  • Ender Chests
  • Loaded Containers
  • Chest Minecarts
  • Hopper Minecarts
  • Inventory Holding Entities
  • UUID Registry
  • Stack Fingerprints
  • Ledger Totals

Player inventories:

/antidupe scan players

Ender Chests:

/antidupe scan ender

Loaded Containers:

/antidupe scan containers

Current Chunk:

/antidupe scan chunk

Automatic Chunk Scanning

Whenever a chunk loads:

  • Wait 20 ticks
  • Scan every inventory holder

Supported block inventories:

  • Chest
  • Trapped Chest
  • Barrel
  • Shulker Box
  • Hopper
  • Furnace
  • Blast Furnace
  • Smoker
  • Crafter
  • Brewing Stand
  • Dropper
  • Dispenser

Supported entities:

  • Chest Minecart
  • Hopper Minecart
  • Inventory Holding Entities

Safe Removal & Recovery

Before removal:

Complete ItemStack is written to:

plugins/Anti-Dupe/recovery.yml

Stored:

  • Material
  • Amount
  • Name
  • Lore
  • Enchantments
  • Durability
  • Components
  • Persistent Data
  • UUID
  • Player
  • World
  • Coordinates
  • Detection Reason
  • Timestamp
  • Recovery ID
  • Restore Status

If writing fails:

  • Item remains untouched
  • Severe error logged

Recovery Commands

Recent entries

/antidupe recovery list

Lookup player

/antidupe recovery player <player>

Restore original owner

/antidupe recovery restore <id>

Restore to another player

/antidupe recovery restore <id> <player>

Permission:

antidupe.recovery

Admin Whitelist

Add

/antidupe whitelist add <player>

Remove

/antidupe whitelist remove <player>

Check

/antidupe whitelist check <player>

List

/antidupe whitelist list

Stored:

plugins/Anti-Dupe/admin-whitelist.yml

Permission:

antidupe.whitelist

Admin Test Command

/dupe

Duplicates the held item.

Ignores:

  • Whitelist
  • OP
  • antidupe.bypass

Used strictly for testing.

Permission:

antidupe.dupe

Private Detection Warnings

Players never receive detection messages.

Warnings go only to:

  • Server Console
  • Admins
  • Daily Log Files
  • Discord

Permission:

antidupe.notify

Daily Logs

Location

plugins/Anti-Dupe/logs/

Filename

anti-dupe-YYYY-MM-DD.log

Automatically rotates every day.

Discord Webhook Alerts

Rich embed notifications.

Config:

discord:
  enabled: true
  webhook-url: ""
  username: "Anti-Dupe"
  avatar-url: ""
  locale: en_US
  embed-color: "#FFB000"
  include-coordinates: true
  role-mention: ""

Embed contains:

  • Player
  • UUID
  • World
  • Coordinates
  • Time
  • Detection Reason
  • Removed Item
  • Removed Quantity
  • Recovery ID
  • Confirmation Item Removed

Webhook runs asynchronously.

Multi-Language Support

Supported locales:

  • de_DE
  • en_US
  • es_ES
  • fr_CA
  • fr_FR
  • it_IT
  • ja_JP
  • pl_PL
  • pt_BR
  • ru_RU
  • tr_TR
  • uk_UA
  • zh_CN

Config:

language:
  default: en_US
  use-client-locale: true

Language files:

plugins/Anti-Dupe/lang/

Discord may use a separate locale.

Permissions

antidupe.admin
antidupe.notify
antidupe.whitelist
antidupe.recovery
antidupe.dupe
antidupe.bypass

Recommended Deployment

Start in:

mode: AUDIT

Test:

  • Crafting
  • Smelting
  • Trading
  • Hoppers
  • Stack Splitting
  • Stack Merging
  • Ender Chests
  • Shulker Boxes
  • Modded Containers

After validation:

mode: QUARANTINE

Quarantine mode:

  1. Preserve original item.
  2. Backup duplicate.
  3. Remove duplicate.
  4. Log incident.
  5. Notify admins.
  6. Send Discord alert.
  7. Allow administrator restoration.