# \ud83d\udee1\ufe0f ProstoCaptcha (by JustPlugins)<\/p>\n
**ProstoCaptcha** is a professional-grade anti-bot solution for **Velocity** proxy servers. Unlike traditional text-based captchas, this plugin leverages the **LimboAPI** to create a fully interactive verification environment, forcing bots to simulate complex human behavior at the protocol level.<\/p>\n
## \ud83d\ude80 Key Features<\/p>\n
### \ud83e\udde9 Multi-Stage Interactive Quests
\nThe plugin features a unique “Quest System” where players must interact with the environment to prove they are human:
\n* **Resource Gathering:** High-precision tracking of mining tasks including wood, stone, iron, coal, and diamonds.
\n* **Crafting & Smelting Logic:** Sophisticated checks where players must interact with Crafting Tables or Furnaces in a logical sequence (e.g., you cannot use a furnace without first obtaining fuel\/ore).
\n* **Action Validation:** Deep inspection of player interactions to prevent automated script bypasses.<\/p>\n
### \ud83d\uddfa\ufe0f Dynamic Map-Captcha
\nHigh-security graphical verification rendered directly on Minecraft maps:
\n* **Advanced Rendering:** Uses `Graphics2D` with anti-aliasing and gradient paints to generate unique codes on the fly.
\n* **OCR Protection:** Random font transformations and custom character sets make it extremely difficult for automated OCR bots to read the code.
\n* **Smart Interaction:** Dedicated session handling for map updates and input verification.<\/p>\n
### \ud83e\ude82 Physics-Based Fall Check
\nA movement-based verification module that monitors gravity and player physics:
\n* **Gravity Analysis:** Requires players to perform a controlled fall to prove they are subject to standard game physics.
\n* **Cheat Detection:** Detects and blocks “Spider,” “Fly,” or “SlowFall” hacks by analyzing movement packets in the Limbo world.<\/p>\n
### \ud83d\udeab Integrated Anti-VPN & Proxy Detection
\nBuilt-in protection against malicious network sources:
\n* **External API Support:** Integrated support for providers like ProxyCheck.io.
\n* **Smart Caching:** Local TTL-based cache for IP decisions to ensure zero latency for legitimate returning players.<\/p>\n
## \ud83d\udee0\ufe0f Technical Specifications<\/p>\n
* **Platform:** Velocity Proxy (Java 17+)
\n* **Dependencies:** LimboAPI (Required).
\n* **Protocol Handling:** Custom implementation of `BlockDigPacket` and `UseItemOnBlockPacket` for low-level action tracking without overhead.
\n* **Visuals:** Full **MiniMessage** support for modern hex-gradients in BossBars, Titles, and Chat.<\/p>\n
## \ud83d\udce6 Project Structure<\/p>\n
* **`me.prostoac.captcha.protocol`**: Custom packet decoders for serverbound-only actions, ensuring efficient communication handling.
\n* **`CaptchaSessionHandler`**: The core logic engine managing the entire lifecycle of player verification from join to success.
\n* **`CaptchaConfig`**: Optimized YAML loader with fallback memory defaults for maximum stability.<\/p>\n
—
\n**Developed with \u2764\ufe0f by JustPlugins**
\n*Empowering server owners with elite-level protection.*<\/p>\n","protected":false},"excerpt":{"rendered":"
\u26a1 Professional Velocity anti-bot by JustPlugins! \ud83d\udee1\ufe0f Map-captcha, interactive quests & smart VPN check. \ud83d\udd17 Works perfectly with LimboAuth \/ LimboAPI! \ud83d\ude80<\/p>\n","protected":false},"featured_media":89179,"template":"","meta":{"_minecraft_slug":"justcaptcha","_minecraft_project_id":"yxp7U0jM","_minecraft_author":"JustPlugins","_minecraft_license":"MIT","_minecraft_downloads":13,"_minecraft_follows":0,"_minecraft_client_side":"unsupported","_minecraft_server_side":"required","_minecraft_storage_type":"zip","_minecraft_archive_name":"justcaptcha.zip","_minecraft_size_bytes":178872,"_minecraft_version_count":3,"_minecraft_updated_at":"2026-05-15T22:55:20.220675Z","_minecraft_date_created":"2026-05-11T01:54:01.039119Z","_minecraft_date_modified":"2026-05-12T11:19:45.510209Z","_minecraft_project_url":"https:\/\/modrinth.com\/mod\/justcaptcha","_minecraft_icon_attachment_id":89179,"_minecraft_imported_at":"2026-06-05T02:16:25+00:00","_minecraft_import_hash":"9f3fc70b23af35c5f551b6736e30c0b8","_minecraft_versions":"","_minecraft_links":"","_minecraft_gallery":"","_minecraft_api_metadata":""},"mod_category":[126,867,92,985],"mod_loader":[986],"minecraft_version":[118,119,120,46,47,48,49,50,51,52,53,54,55,56,57,58,59,36,60,93,94,101,102,62,37,40,41,73,74,38,78,79,80,81,82],"class_list":["post-89178","mod","type-mod","status-publish","has-post-thumbnail","hentry","mod_category-management","mod_category-social","mod_category-utility","mod_category-velocity","mod_loader-velocity","minecraft_version-1-16","minecraft_version-1-16-1","minecraft_version-1-16-2","minecraft_version-1-16-3","minecraft_version-1-16-4","minecraft_version-1-16-5","minecraft_version-1-17","minecraft_version-1-17-1","minecraft_version-1-18","minecraft_version-1-18-1","minecraft_version-1-18-2","minecraft_version-1-19","minecraft_version-1-19-1","minecraft_version-1-19-2","minecraft_version-1-19-3","minecraft_version-1-19-4","minecraft_version-1-20","minecraft_version-1-20-1","minecraft_version-1-20-2","minecraft_version-1-20-3","minecraft_version-1-20-4","minecraft_version-1-20-5","minecraft_version-1-20-6","minecraft_version-1-21","minecraft_version-1-21-1","minecraft_version-1-21-10","minecraft_version-1-21-11","minecraft_version-1-21-2","minecraft_version-1-21-3","minecraft_version-1-21-4","minecraft_version-1-21-5","minecraft_version-1-21-6","minecraft_version-1-21-7","minecraft_version-1-21-8","minecraft_version-1-21-9"],"yoast_head":"\n