How to Change Your Minecraft Username:
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Minecraft Username Change Frequency: You can change your Minecraft username once every 30 days.
Availability of Old Usernames: After changing your Minecraft username, you can switch back to your previous one after 30 days. Other users must wait 37 days before they can claim your old username.
Understanding UUID (Universally Unique Identifier): UUID stands for Universally Unique Identifier. Each Minecraft account has a distinct UUID. For example, Notch's UUID is 069a79f4-44e9-4726-a5be-fca90e38aaf5. The UUID remains constant, allowing servers to consistently track players, ensuring that bans, ranks, etc., persist even if the player changes their name.
Uploading Your Minecraft Skin: To upload your Minecraft skin: