IronCore is a library/utility mod required by the Iron-collection mods like Iron Chest (more to come). The mod is used to provide shared, common logic between these mods, as well as some useful utilities.
Lock any supporting container with a Container Key (Shift + Right-Click). The owner and trusted players can access it; everyone else gets no access. Locked containers cannot be used in automations (like hoppers). Keys carry a trusted list: edit it once, every linked container syncs. Rename a key in an anvil to label it. Locking can be switched off entirely with enableLocks in config/ironcore.json without losing data.

Upgrade items upgrade a container into its next tier in place, inventory included. Shift + Right-Click the container with the matching upgrade.

Relocate filled containers with contents and lock intact. Shift + Right-Click to lift, Right-Click to set down.
config/ironcore.json.
Loader API only (Fabric API on Fabric, nothing extra on NeoForge).