I used the patchouli guide book in 1.16.5, what about porting this feature to all versions.
And also what EXACTLY does the difference between the key and heavy key in supplesqared mod
Like the heavy key sync between worlds or if you craft them they are unique and cannot manipulated.
Make it so that they make a random NBT tag with a code like the UUID of the player who craft them and their owner on the key's tool tip for easier distinguish between the keys

Add a keyring
Stores 10 keys and works like a bundle

I am having troble of creating a door lock system for my create parkour map

the book wasnt maintained by me. patchouli changed a bunch of stuff in 1.17 so the thing was never ported.
Heavy keys have a password that is unique to the item using a random UUID that cant be obtained with a normal key. Not a fan of the key ring. keys already work in all slots and they are niche enoiugh that i couldnt justify another item just for that. as for the tooltip idk what it could be, i think a better way would be to let players name them with an anvil to tell them apart or add item lore to them wiht a name tag in anvil