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Run seed in the Purpify game panel console to display the active Java world’s seed.
Start the server, open the console, and enter:
The result appears in the console or chat. Copy the complete value, including a leading minus sign when present.
Changing level-seed in server.properties does not rebuild terrain that already exists. Use a fresh world when you want all terrain generated from a different seed.

Java server properties

Review level-seed, level-name, and other world-generation settings.