UUIDv47: Store UUIDv7 in DB, emit UUIDv4 outside (SipHash-masked timestamp)

Re:UUIDv47: Store UUIDv7 in DB, emit UUIDv4 outside (SipHash... by timando on Thursday September 18, 2025 @12:20AM (#45285348)

Why does it use version 4 instead of version 8? Version 4 implies that it's random bits, but it's actually not random. Version 8 doesn't imply anything about what the bits mean.

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Re:UUIDv47: Store UUIDv7 in DB, emit UUIDv4 outside (SipHash... by flowerthoughts on Thursday September 18, 2025 @02:51AM (#45286356)

I can't answer that, but as long as it's a high entropy algorithm, this seems fair game. You could see it as a seeded PRNG. The whole point of the exercise is to make it look random to the outside. Perhaps v8 stands out too much.

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