[dkersten]

The version bits are for the UUID version though, not for your own versioning use. It doesn't sound like your v5 UUID was actually a UUID v5 (with namespace), so are your new UUID's even RFC 4122 compliant anymore?

At this point, you could just use one of these not-a-UUID replacements and include a few versioning bits of your own. Of course, you'd have to plan it in advance, my point is you used a lucky hack, not a feature of UUID's.

[js2]

If I hadn't been using RFC 4122 UUIDs, I wouldn't have had any reserved bits to work with. There are a bunch of places in this system that restricted the report ID to be a hex string of length 32 that would have needed updating if I switched to a different format.

There's also no functional difference between a v4 UUID and a v5 UUID with fixed namespace and random bits for the name portion, so I disagree what I'm doing is no longer RFC 4122 compliant.

It's lucky I used RFC 4122 UUIDs in the first place, that I could take advantage of the designers foresight to set aside some extra bits.