Undocumented String in getGJLevels21.php?

[CoderQCYT]

After the end of every request from getGJLevels21.php, there seems to be this weird UUID thing. (f424a5e278a6971ea4af35b2324cd1ad8c5c8166)

Does anyone know what this is?

[Cvolton]

verification hash, see genMulti here https://github.com/Cvolton/GMDprivateServer/blob/master/incl/lib/generateHash.php#L4