Professional Item Duplication Detection & Prevention

Protect your server's economy and integrity
with fast & reliable enterprise-grade duplicate detection.

Best Anti-Dupe that can easily trace back how the exploit works

Check out the VERY detailed WIKI pages

Why Choose DupeTrace?

Item duplication exploits are the #1 threat to server economies. A single dupe glitch can:

Destroy months of careful server balancing
Make legitimate players quit in frustration
Crash your economy overnight
Force rollbacks that punish innocent players

DupeTrace stops dupes BEFORE they spread by:

✅ Tracking every non-stackable item with invisible UUID fingerprints
✅ Detecting when the same item appears in multiple locations simultaneously
✅ Auto-removing duplicates in real-time (configurable)
✅ Logging complete forensic histories for investigations
✅ Working passively without breaking other plugins or game mechanics

Built for performance. DupeTrace uses asynchronous database operations, connection pooling, and smart caching to handle 200-1000 events/second without impacting your server TPS.
(equal to 10-50 players actively spamming non-stackable item events. you're fine)

Key Features

🔍 Automatic Duplicate Detection: Tracks all non-stackable items with unique IDs stored in NBT data
🗃️ PostgreSQL Database: Enterprise-grade persistence handles millions of records without slowdown
⚡ Real-time Monitoring: Comprehensive event tracking across 30+ Bukkit events
🛡️ Auto-Removal: Optional automatic removal of duplicated items (keeps the oldest legitimate copy)
📣 Discord Webhook Alerts: Send duplicate alerts to your Discord server with formatted embeds
🎨 Creative Mode Support: Configurable handling of Creative mode duplication
📊 Deep Container Scanning: Recursively tracks items inside Shulker Boxes and Bundles
🔧 Highly Configurable: Fine-tune detection sensitivity, grace periods, and performance settings
🔬 Forensic Tools: Complete transfer history and player-based item searches for investigations
🚀 Zero-Lag Design: All database operations run asynchronously on separate threads

Performance Metrics

Lightweight & Fast

Memory Usage: ~25-35 MB total (plugin + connection pool + cache)
CPU Impact: < 1% on modern hardware
TPS Impact: None (all database operations are async)
Event Throughput: Handles 200-1000 item events/second without lag
Database Growth: 150-200 MB per million transfers (1-2 GB/month on active servers)

Optimized for Scale

Tested for servers with 500+ concurrent players
Connection pooling handles concurrent database access efficiently
Smart in-memory caching reduces database queries
Configurable TTL prevents memory leaks on long-running servers

Configuration (required!)

After first start, edit the generated plugins/DupeTrace/config.yml
Add your PostgreSQL details
Restart the server

Commands

command	description
`/dupetest give`	Give yourself a Diamond Sword tagged with a unique ID
`/dupetest uuid <uuid>`	View item's recent transfer history (latest 10 entries)
`/dupetest history <uuid> [limit]`	View full transfer log (default limit: 50)
`/dupetest stats`	View plugin and database statistics
`/dupetest search <player>`	List tracked items associated with a player

Command aliases: /dt & /dtrace

Large Servers

(Recommended for 100+ players)

scan-interval: 300 # Increase to 15 seconds
inventory-open-scan-enabled: false # Disable for max performance
database:
  postgres:
    pool-size: 20 # Increase pool size
known-items-ttl-ms: 300000 # Reduce to 5 minutes

Permissions

permissions	description	default
dupetrace.admin	Allows access to DupeTrace admin commands	op
dupetrace.alerts	Receive duplicate alerts from DupeTrace	op

Dependencies

A (remote) PostgreSQL Database is required!

Dependencies (included)

kotlin-stdlib-jdk8 - Kotlin standard library
HikariCP 5.1.0 - Database connection pooling
PostgreSQL 42.7.4 - PostgreSQL JDBC driver
adventure MiniMessage 4.25.0 - Minecraft Java UI Library

In Active and Continues development. Check out the VERY detailed WIKI pages

Discord

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DupeTrace

📖About DupeTrace