AntiSeedCracker

Stop seed crackers. Silently. Permanently.

AntiSeedCracker is a professional, multi-layer world seed protection plugin for Paper, Purpur, and Folia. It defeats every known technique that cheat clients, ghost clients, and tools like SeedCrackerX use to recover your world seed — without ever kicking, banning, or even alerting the player. Cheaters simply receive cryptographically random garbage and never know why their cracker fails.

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Why protect your seed?

Once a player knows your world seed, they can compute the exact location of every stronghold, ancient city, buried treasure, ore vein, and slime chunk on your server — from an external tool, with no in-game effort. Seed knowledge is wallhack-grade ESP for the entire map. AntiSeedCracker closes every leak.

Protection layers

• Packet-level seed spoofing — replaces the hashed seed in JOIN_GAME and RESPAWN packets with a per-player, cryptographically random fake before it ever leaves the server (Netty-level via bundled PacketEvents).
• Dynamic seed rotation — every player's fake seed rotates on a configurable interval, defeating crackers that accumulate data across sessions.
• Plugin API protection — patches the internal seed field every second, so even other plugins calling World.getSeed() receive a fake value.
• Eye of Ender redirection — thrown Eyes fly toward a per-player fake stronghold with randomized angular jitter, making triangulation useless.
• /locate spoofing — returns convincing fake coordinates; stronghold queries stay consistent with Eye of Ender behavior.
• Seed command blocking — /seed and friends are blocked for players, console, RCON, and stripped from tab-complete.
• End spike randomization — shuffles the bedrock cap heights of the ten End pillars, destroying the vanilla height fingerprint that uniquely identifies a seed.
• End City fingerprint removal — replaces the distinctive magenta glass pattern in End Cities.
• Treasure & explorer map scrambling — structure icons on maps are randomized in the MAP_DATA packet.
• Audit log — every blocked attempt is recorded to a lightweight flat-file log, with /asc stats summaries in-game.

Never punishes players

AntiSeedCracker follows a strict no-punishment philosophy: no kicks, no bans, no warnings. Cheat tools silently fail while legitimate gameplay is completely unaffected.

Safe for your world

• The real seed is never read into logs, files, or network traffic.
• World generation is never altered — protection happens at the packet and API layer.
• Optional cosmetic changes (End spike caps, End City glass) are single-block, physics-free, run at most once per chunk, and can be disabled in the config.
• Verified by live testing on Paper 26.1.2 and Folia 26.1.2 with zero errors and untouched world generation.

Performance

Fully asynchronous by design. Packet work runs on Netty I/O threads with lock-free map lookups; periodic tasks use the async scheduler; on Folia, block operations are dispatched to the owning region thread. Zero measurable TPS impact.

Requirements & compatibility

Server software	Paper, Purpur, or Folia
Minecraft version	26.1 and newer (26.1.x – 26.2)
Java	25 or newer
Dependencies	None — PacketEvents is bundled

Spigot/CraftBukkit and legacy Minecraft versions (1.16.5 – 25.x) are not supported by this release, as the plugin relies on modern Paper APIs for its async and region-threaded architecture.

Quick start

1. Drop AntiSeedCracker-3.2.0.jar into your plugins/ folder.
2. Restart the server. Protection is active immediately with sensible defaults.
3. Optionally tune plugins/AntiSeedCracker/config.yml (every layer, world list, message, and interval is configurable) and apply with /asc reload.

Commands

• /asc status — see every protection layer at a glance
• /asc stats — audit log statistics
• /asc reload — apply config changes live
• /asc info — version, platform, and update status

Permission: antiseedcracker.admin (default: op)

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Open source under the MIT License: https://github.com/SunsetRQ/AntiSeedCracker Issues and feature requests welcome on GitHub. Anonymous usage metrics via bStats (opt-out supported).