0 to 0. 4 bits are used to store version/type of UUID, random and generated from name, have other types. https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html#version-- Duplicates in cracked uuids? maybe... but... there isn't big chance, but IDK why mojang added that "OfflinePlayer:" I think that this make bigger chance for collision. So I think that it's safe enough.