[Solved] Best Unique Identifier alternative [duplicate]

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The best post so far I have come up with: can be found here.
The post discuss many alternatives, the best one I have found is to generate the CFUUID and save it in the keychain. Because its very rare that a user will reset his device/keychain.

  1. Get UUID from keyChain
  2. if UUID found ok, return back the UUID.
  3. if no UUID found generate UUID.
  4. Save UUID in KeyChain
  5. Return UUID from keyChain.

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solved Best Unique Identifier alternative [duplicate]