SeedCracker VS EnchantmentCracker

If you don't respect this, you can use https://github.com/KaptainWutax/SeedCracker

Custom code, usually. KaptainWutax made a program a few years ago which can crack seeds just by scanning the world. When seed cracking, though, you are looking for certain features which can rule out many many seeds very easily. For example, finding specific dungeon coordinates and mossy cobble patterns can narrow it down dramatically. For this process, you need not scan that much since it's some simple maths applied to not that many blocks and not checking very many times.

Im not an expert but cords are needed or at least if you want to solve it in any time. you say you play on that SMP so maybe use seedcrackermod but KaptainWutax. It is a fabric mod that searches the world for structures like shipwrecks and once you find 5 of them it can crack the seed within minutes or even less (depends on your gpu)

Otherwise, I found a mod that will calculate a server's seed but you have to actually be on the server; most of the actual tools seem to be private, most likely due to security concerns as stated above.

Link: https://github.com/Earthcomputer/EnchantmentCracker/releases/tag/v1.6

Also I think it's actually possible to manipulate the enchantments you get from a table: https://github.com/Earthcomputer/EnchantmentCracker/releases

If there is any sort of client that does that, im sure that it isn't free, and it is probabily the easiest ways to get banned, but I recommend just using https://github.com/Earthcomputer/EnchantmentCracker to have good enchantments, but recommend looking into the description to see if your server is compatible with this mod

The RNG manipulation of some players on my server is too powerful(like this Earthcomputer/EnchantmentCracker: Cracking the XP seed in Minecraft and choosing your enchantments (github.com) ), which affects the balance of the game. Can the RNG be modified to achieve the purpose of disabling manipulation?

The GitHub for the Java tool (though there’s also a fabric mod now): https://github.com/Earthcomputer/EnchantmentCracker

Enchanting tables are random. There are like billions of possible XP seeds the game could pick. Once you get the player seed, you could manipulate the RNG. And then enchant to get the enchantments you want and not get the enchantments you don't want. There are like so many ways. There are rules. During the process, you cannot eat, sprint, use unbreaking tools, switch dimensions, die and possible many more. This is how you do it. You first need to download the tool here. Next, you start up Minecraft Java, prepare your inventory, dummy items, items you want to enchant, at least 6 lapis lazuli and of course at least 33 levels. There is a formula. Open up your Minecraft world, get full hunger, unbound sprint key (optional), remove unbreaking tools from inventory, chests to store items to be enchanted and a LOT of items. At one point, i needed to throw out 11 STACKS of items. Of course, get 7 blocks that you can break instantly and a 15 bookshelf level 30 setup. To start, you enchant a dummy item. Then you can discard it or store it. Then for the next item, you get the first XP seed. You need to know how many levels are needed for each slot and number of bookshelves. You will "reduce" the bookshelf count until you find the first XP seed. Once you find the seed, you can enchant the 2nd dummy item. Reset the cracker and get the second XP seed. Once you get it, don't enchant the dummy item just yet and calculate the player seed. So let's say you want to enchant a Netherite Pickaxe with Efficiency 4. Unbreaking 3 and Fortune 3, you can do that. You will do what it says. If it says no dummy, directly enchant the pick but if it says the items you need to throw, throw it, enchant the dummy and then enchant the real item. This process can be repeated many times if you have a lot of levels and lapis. This saves more levels than just wishing for the items you want. The items may also be cheap to rename so it's a win win. For more info, here is the video made by Earthcomputer.

The mod link