Hi, say I have billions of things that I would like to individually name (give a unique identifying number), what is the best way to go about that? I would like to minimise the amount of data that is needed to uniquely identify each object, as it then takes less memory to store and transmit. So far what I have been thinking along the lines of concatenating the date and time of creation. This is fine but if things are made concurrently this would not work. Any ideas?