Add ctlog landing page

content/ctlog.md

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+---
+title: 'Certificate Transparency'
+date: 2025-07-30
+url: /s/ct
+---
+
+Certificate Transparency logs are "append-only" and publicly-auditable ledgers of certificates being
+created, updated, and expired. This is the homepage for IPng Networks' Certificate Transparency
+project.
+
+Certificate Transparency [[CT](https://certificate.transparency.dev)] is a system for logging and
+monitoring certificate issuance. It greatly enhances everyone’s ability to monitor and study
+certificate issuance, and these capabilities have led to numerous improvements to the CA ecosystem
+and Web security. As a result, it is rapidly becoming critical Internet infrastructure. Originally
+developed by Google, the concept is now being adopted by many _Certification Authories_ who log
+their certificates, and professional _Monitoring_ companies who observe the certificates and
+report anomalies.
+
+IPng Networks runs our logs under the domain `ct.ipng.ch`, split into a `*.log.ct.ipng.ch` for the
+write-path, and `*.mon.ct.ipng.ch` for the read-path.
+
+We are submitting our log for inclusion in the approved log lists for Google Chrome and Apple
+Safari. Following 90 days of successful monitoring, we anticipate our log will be added to these
+trusted lists and that change will propagate to people’s browsers with subsequent browser version
+releases.
+
+We operate two popular implementations of Static Certificate Transparency software.
+
+## Sunlight
+
+[[Sunlight](https://sunlight.dev)] was designed by Filippo Valsorda for the needs of the WebPKI
+community, through the feedback of many of its members, and in particular of the Sigsum, Google
+TrustFabric, and ISRG teams. It is partially based on the Go Checksum Database. Sunlight's
+development was sponsored by Let's Encrypt.
+
+Our Sunlight logs:
+*    A staging log called [[Rennet](https://rennet2025h2.log.ct.ipng.ch/)], incepted 2025-07-28,
+     starting from temporal shard `rennet2025h2`.
+*    A production log called [[Gouda](https://gouda2025h2.log.ct.ipng.ch/)], incepted 2025-07-30,
+     starting from temporal shard `gouda2025h2`.
+
+## TesseraCT
+
+[[TesseraCT](https://github.com/transparency-dev/tesseract)] is a Certificate Transparency (CT) log
+implementation by the TrustFabric team at Google. It was built to allow log operators to run
+production static-ct-api CT logs starting with temporal shards covering 2026 onwards, as the
+successor to Trillian's CTFE.
+
+Our TesseraCT logs:
+*    A staging log called **Lipase**.
+*    A production log called **Halloumi**.
+
+## Operational Details
+
+You can read more details about our infrastructure on:
+*   **[[TesseraCT]({{< ref 2025-07-26-ctlog-1 >}})]**, published on 2025-07-26.
+*   **Sunlight** (todo)
+*   **Operational Notes** (todo)
+
+The operators of this infrastructure are **Antonis Chariton**, **Jeroen Massar** and **Pim van Pelt**. \
+You can reach us via e-mail at [[<ct-ops@ipng.ch>](mailto:ct-ops@ipng.ch)].
+