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Citations & sources

A traceable list of the standards, specifications and vendor docs behind every technical claim on QRCode Suite — from SHA-256 IP hashing to ISO 18004 QR error correction. Built so engineers, compliance teams and AI search engines can verify the source directly.

Every technical claim on this site links back to the underlying standard, RFC, or vendor documentation.

  1. IP addresses are hashed with SHA-256 before storage and never persisted in raw form.

  2. QR code error correction supports four levels (L 7%, M 15%, Q 25%, H 30%) of redundancy.

  3. GDPR requires lawful basis, data minimisation, and rights of access, rectification, and erasure.

  4. WordPress 6.0 introduced full-site editing and PHP 8.1 was first formally supported in WordPress 6.1.

  5. Schema.org FAQ markup is supported in Google Search for FAQ rich results.

  6. Schema.org HowTo markup is recognised by Google for step-by-step instructional content.

  7. hreflang annotations help search engines serve the right language version of a page to each user.

  8. Stripe processes recurring subscriptions, handles 3-D Secure, and exposes a Customer Portal for self-service billing.

  9. WooCommerce order metadata can be extended with custom fields stored in `wp_postmeta`.

  10. OWASP recommends bcrypt with a cost factor of 10–12 for password hashing.

  11. Cloudflare R2 supports presigned URLs via the S3-compatible API.

  12. Next.js 15 emits hreflang via the `alternates.languages` field on the page metadata API.

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