Digging into the discussions in the repo’s issues, I found someone linking to this comparison between ULIDs and UUIDs: https://uuid.ramsey.dev/en/stable/rfc412

Digging into the discussions in the repo’s issues, I found someone linking to this comparison between ULIDs and UUIDs: https://uuid.ramsey.dev/en/stable/rfc4122/version7.html https://uuid.ramsey.dev/en/stable/rfc4122/version7.html In short, it seems UUIDv7 is storage-wise compatible with ULID but not vice versa due to UUID’s versioning bits.