Before using this....

Consider what you'll do if someone ever gets root in your web server and leaks the key.

Suddenly all your UUID's need to be replaced. That tends to be impossible since they're probably part of published URL's etc.

Big companies have made similar mistakes - that's probably why for example all private YouTube videos and Google docs had their links invalidated a few years back when the key security of a decade old key couldn't be certain and the key wasn't rotatable.

TL;DR: Never use anything where you cannot rotate a key, including this.