Anti-Dupe

Compatibility: Bukkit / Spigot / Paper / Purpur (1.21.11)
Author: CraniX@gmail.com
Discord: https://discord.com/invite/SfEHT6TEdm
Ko-fi: https://ko-fi.com/cranix

Key Features

Advanced Item Duplication Prevention (For un-stackable items)

• Uses a hybrid system of deterministic hashes and per-item unique IDs to safely detect duplicated items without false positives.

Lineage-Aware Serialization (For stackable items)

• Players can now combine similar stackable items even when items carry different lineage / NBT data.
• Lineage serial ranges are merged correctly
• No data is lost
• Inventory consolidation behaves like vanilla Minecraft

Inventory & Cross-Inventory Scanning

• Detects duplicate items within a player’s inventory and across all online players. Keeps legitimate copies and removes only excess items.

Custom Item Rules (Name-Based)

• Track custom items by display name, not NBT or material, preventing renamed items from bypassing detection.

Per-Item Hash Modes

• NAME – stackable items share a deterministic hash (ideal for currencies like Money Sachets)
• UNIQUE – non-stackable or special items get a unique ID per item

Custom Stack Sizes (Per Item)

• Define allowed stack sizes for both vanilla and custom items via commands or config.

Always-Scanned Custom Items

• Custom items are always checked, even when onlyscan mode or material exclusions are enabled.

Multi-Language Support

• Added in game language support for the following.

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

Safe Removal & Recovery System

• Excess duplicate items are backed up to recovery.yml instead of being deleted.

Multi-Language Discord Webhook Alerts (Embed Messages)

• Sends rich embed notifications in multiple languages to a Discord channel when a duplication is detected. )

Admin Whitelist

• Exempt trusted players from all anti-dupe checks.

OnlyScan Mode

• Scan only high-value items for performance, while still protecting all custom items.

Automatic Ban Option

• Optionally bans players caught duplicating, with full logging.

Hot Reload Support

• Reload custom item rules, stack sizes, hash modes, language files, and Discord config without restarting the server.

Detailed Logging

• Duplication attempts logged in dupe_log.yml, bans recorded in bans.yml.

Support

For bugs, suggestions, or questions, join us on Discord:
https://discord.com/invite/SfEHT6TEdm