---
title: "stateless-me/uuidv47: ⚡ UUIDv47 = v4 privacy + v7 performance"
url: https://daily.dev/posts/k8onkogi7
source_url: https://github.com/stateless-me/uuidv47
type: share
source: "Deleted user"
author: "Deleted user"
published: 2025-09-17T17:05:48.657Z
updated: 2025-09-17T17:06:19.954Z
tags: ["performance", "database", "c", "cryptography"]
upvotes: 20
comments: 1
language: en
---

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> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# stateless-me/uuidv47: ⚡ UUIDv47 = v4 privacy + v7 performance

**[Deleted user](https://daily.dev/sources/404)** · [@ghost](https://daily.dev/ghost) · 20 upvotes · 1 comments

## Summary

UUIDv47 is a C library that combines UUIDv7's database performance benefits with UUIDv4's privacy features. It stores sortable UUIDv7 internally for better database indexing while presenting UUIDv4-looking identifiers externally through SipHash-masked timestamps. The library provides deterministic, invertible mapping with key-recovery resistance and maintains RFC compatibility.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://github.com/stateless-me/uuidv47>

## Community discussion

Top comments from developers on daily.dev.

**@debajyatidey** · 1 upvotes

> next level!!!

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---

Tags: [#performance](https://daily.dev/tags/performance), [#database](https://daily.dev/tags/database), [#c](https://daily.dev/tags/c), [#cryptography](https://daily.dev/tags/cryptography)

[View this post on daily.dev](https://daily.dev/posts/k8onkogi7)