>>>>What is the need for randomness? Not clear from the post. Why not ask the server for a unique ID if GUID is considered too flakey?
>>>
>>>Don't think GUIDs are flaky (at least compared to other options). If you ask a server to generate an ID (what are you suggesting? An int?) you have problems with overlapping hits......
>>
>>calling into DB table, creating records with candidate key, perhaps with some rules invalidating to stem growth without prune
>
>But why bother ?

There are a couple of UC where the device / endpoint making changes has to be logged as well. -If/When the ID of the device has to enter the "DB space", the mechanics of the DB might be used again. Embolded part of my original post does not imply I think GUID is especially untrustworthy, but if there are very demanding specs I'd trust a DB based ID generating mechanism more.