code: func SetNodeID(id []byte) bool {
  	if len(id) < 6 {
  		return false
  	}
  	defer nodeMu.Unlock()
  	nodeMu.Lock()
  	copy(nodeID[:], id)
  	ifname = "user"
  	return true
  }
docs: // SetNodeID sets the Node ID to be used for Version 1 UUIDs.  The first 6 bytes
  // of id are used.  If id is less than 6 bytes then false is returned and the
  // Node ID is not set.