The best replacement for guid is mbr.

The best alternatives to guid are rated as following:
★★★★★  mbr
★★★★  uuid
★★★  apple partition
★★★  int
★★★  sid
★★  gpt
★  master boot
★  apple partition map
★  int primary key
★  random number
★  int sql server
★  identity
★  apm
  dll guid
  sequence
  bigint
  autonumber
  guid
  autoincrement
  sequence oracle
  integer primary key
  assembly guid

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guid
mbr
uuid