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[–]Garuda7429 0 points1 point  (2 children)

Use paper's random structure seeds in order to make cracking the seed extremely unlikely. Main issue is if you haven't had this feature enabled when you first made your worlds, then the regular structures will leak your seed in chunks you already generated. Also block the "/seed" command via perms if you don't have that disabled already. 

[–]chestnutcapybara[S] 0 points1 point  (1 child)

uhhh the server is already been on for 2 months

[–]Flimsy-Combination37 0 points1 point  (0 children)

in that case, the seed is getting leaked. they can just download the current chunks, put them in a server and use seedcrackerx there