For me.. the time it takes for a single core to generate a UUIDv1 guarantees it will be unique. Even in a multi core situation if the UUID generator only allows one UUID to be generated at a time for your specific resource (keep in mind that multiple resources can totally utilize the same UUIDs however unlikely since the resource inherently part of the address) then you will have more than enough UUIDs to last you until the timestamp burns out. At which point I really doubt you would care.
