base on Fully async, multithreaded, predictive, open source, 3.01 reach, 1.005 timer, 0.01% speed, 99.99% antikb, "bypassable" 1.8-1.21 anticheat. # GrimAC GrimAC is an open source Minecraft anticheat designed for 1.21 and supports 1.8-1.21. It is free while in beta. It will eventually become paid and/or will include offering additional subscription based paid checks. Geyser players are fully exempt. This project is considered feature complete for the 2.0 (open-source) branch of this project. If you would like a bugfix or enhancement and cannot sponsor the work, pull requests are welcome. ## Downloads - [Modrinth](https://modrinth.com/plugin/grimac) - [Hangar](https://hangar.papermc.io/GrimAnticheat/GrimAnticheat) - [SpigotMC](https://www.spigotmc.org/resources/grim-anticheat.99923/) - *For bleeding edge builds use* [Github artifacts](https://nightly.link/GrimAnticheat/Grim/workflows/gradle-publish/2.0/artifact.zip) ## Installation notes > [!WARNING] > Java 17 is now required. More information [here](https://github.com/GrimAnticheat/Grim/wiki/Updating-to-Java-17). - Paper, Spigot, and Folia are currently supported. - If you use Geyser, place Floodgate on the backend server so grim can exempt bedrock players. Grim cannot access the Floodgate API if it is on the proxy. - If you use ViaVersion, it should be on the backend server as movement is highly dependent on client version. ## Support & wiki information - Support & discussion: [Discord](https://discord.com/invite/kqQAhTmkUF) - Report issues: [Issues](https://github.com/GrimAnticheat/Grim/issues/new/choose) - Wiki & examples: [Wiki](https://github.com/GrimAnticheat/Grim/wiki) ## Developer API Grim's API allows you to integrate Grim into your own plugins. - API repository: [GrimAPI](https://github.com/GrimAnticheat/GrimAPI) - Wiki info: [Wiki](https://github.com/GrimAnticheat/GrimAPI) ## How to compile 1. `git clone https://github.com/GrimAnticheat/Grim.git` 2. `cd Grim` 3. `./gradlew build` 4. The final jar will compile into the build/libs folder ## Grim supremacy What makes Grim stand out against other anticheats? ### Movement Simulation Engine * We have a 1:1 replication of the player's possible movements * This covers everything from basic walking, swimming, knockback, cobwebs, to bubble columns * It even covers riding entities from boats to pigs to striders * Built upon covering edge cases to confirm accuracy * 1.13+ clients on 1.13+ servers, 1.12- clients on 1.13+ servers, 1.13+ clients on 1.12- servers, and 1.12- clients on 1.12- servers are all supported regardless of the large technical changes between these versions. * The order of collisions depends on the client version and is correct * Accounts for minor bounding box differences between versions, for example: * Single glass panes will be a + shape for 1.7-1.8 players and * for 1.9+ players * 1.13+ clients on 1.8 servers see the + glass pane hitbox due to ViaVersion * Many other blocks have this extreme attention to detail. * Waterlogged blocks do not exist for 1.12 or below players * Blocks that do not exist in the client's version use ViaVersion's replacement block * Block data that cannot be translated to previous versions is replaced correctly * All vanilla collision boxes have been implemented ### Fully asynchronous and multithreaded design * All movement checks and the overwhelming majority of listeners run on the netty thread * The anticheat can scale to many hundreds of players, if not more * Thread safety is carefully thought out * The next core allows for this design ### Full world replication * The anticheat keeps a replica of the world for each player * The replica is created by listening to chunk data packets, block places, and block changes * On all versions, chunks are compressed to 16-64 kb per chunk using palettes * Using this cache, the anticheat can safely access the world state * Per player, the cache allows for multithreaded design * Sending players fake blocks with packets is safe and does not lead to falses * The world is recreated for each player to allow lag compensation * Client sided blocks cause no issues with packet based blocks. Block glitching does not false the anticheat. ### Latency compensation * World changes are queued until they reach the player * This means breaking blocks under a player does not false the anticheat * Everything from flying status to movement speed will be latency compensated ### Inventory compensation * The player's inventory is tracked to prevent ghost blocks at high latency, and other errors ### Secure by design, not obscurity * All systems are designed to be highly secure and mathematically impossible to bypass * For example, the prediction engine knows all possible movements and cannot be bypassed ", Assign "at most 3 tags" to the expected json: {"id":"10400","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"