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A comment on UUIDv47: Store UUIDv7 in DB, emit UUIDv4 outside (SipHash-masked timestamp). Parent comment

Re:UUIDv47: Store UUIDv7 in DB, emit UUIDv4 outside (SipHash... by tart-lemonade on Wednesday September 17, 2025 @01:44PM (#45278996)
Just to clarify, do you mean that UUIDv4 in general is worse, or just this 7->4 obfuscation?
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Re:UUIDv47: Store UUIDv7 in DB, emit UUIDv4 outside (SipHash... by the_mitsuhiko on Wednesday September 17, 2025 @01:50PM (#45279057)
I'm not saying anything about better or worse. I'm saying that UUID v4 by definition has high entropy and UUID v7 does not. You can always go from low to high entropy, but not the other way around.
[ Parent | on HN ]