In earlier versions of the Minecraft launcher (before Dungeons was added to the main launcher), the file is instead launcher_profiles.json.Open file launcher_accounts.json in a text editor such as Notepad.This is located at %APPDATA%\.minecraft on Windows, ~/Library/Application Support/minecraft on macOS, and ~/.minecraft on Linux.Note that this only works offline, in singleplayer – you will not be able to join any online mode multiplayer servers under any situation in any name you have not purchased and will be prevented from joining any online mode multiplayer servers if your client username does not match. This tutorial will show you how to load up multiple instances of Minecraft with different usernames on the same computer to join the same world via LAN. As shown here, the usernames can be any string of characters, although this will break commands.Įvery so often there comes a time where you need to test out a multiplayer map in singleplayer and you don't have quick access to other accounts. Having alternate accounts is useful for testing multiplayer maps in singleplayer. To determine the version-3 UUID corresponding to a given namespace and name, the UUID.This tutorial is exclusive to Java Edition. The specification provides UUIDs to represent the namespaces for URLs, fully qualified domain names, object identifiers, and X.500 distinguished names but any desired UUID may be used as a namespace designator. The namespace identifier is itself a UUID. Version 3 uses MD5 as the hashing algorithm, and version 5 uses SHA-1. Version-3 and version-5 UUIDs are generated by hashing a namespace identifier and name. More info can be found on Wikipedia: en. Universally unique identifier | Versions 3 and 5 (namespace name-based) These transformations are required for it to be a valid version 3 UUID. We can see that byte 7 ( md5Bytes) and byte 9 ( md5Bytes) are different, which corresponds to the transformation that UUID.nameUUIDFromBytes performs. Md5Bytes |= 0x80 /* set to IETF variant */ Specifically: md5Bytes
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