ModsJava
OCAIP
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
What's it do?
It adds a bit of auth to offline-mode, while allowing normal online connections.
which prevents account trolling when playing in a LAN. (also skins)
How does it do it?
- Client creates a private key (this is kindof like a password but more secure and automatic)
- Client connects to server
- If the client hasn't connected before the server will prompt a registration password/proof of work
- The server will remember the public key and later logins will be seamless
see github readme for config details
Required on both Client and Server
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.20.2, 1.20.3, 1.20.4
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as OCAIP-1.3.5.jar — drop this file into the mods folder
- Download size: 115 KB
- Download link checked 25 Sept 2026 — working
These come from our own check of the pack file, not from the source page.