Originally posted by iaregamertom:

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EDIT

Not sure how world seeds work, I play single player and dont want anyone in/changing my world, I dont have the server button ticked so if its possible to share the seed without y world being affected I will post it tomorrow for anyone interested, if nothing else, it a great quick way to get cores in a pinch

It should say the world seed next to the world name, just post that and people making their own worlds can type it in. Folks can only change your world if you open it up as a server.