Proposal for CT Operator-published log metadata

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Clint Wilson

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Oct 17, 2025, 7:08:52 PMOct 17
to ct-p...@chromium.org
Hello all!

Building on the fantastic work that’s occurred over the last year to provide more robust information about the state of CT Logs, such as https://googlechrome.github.io/CertificateTransparency/inclusion_request_schema.json and https://github.com/FiloSottile/sunlight/commit/49406f3a7f9339c4554ed0f94db6d2e8f2e46575, we want to propose a further evolution of CT Log metadata published by Log Operators to support additional automation within the CT Ecosystem.

The proposal is shared here: https://docs.google.com/document/d/1KIBO8OjTHcmf6e2OsEGYanovC9LWIQL6sS9N8XODmt4 and should be publicly accessible and allow comments from anyone.

We’d love to hear your thoughts on this proposal, from Log Operators, Monitors, technology maintainers, Log Programs, and interested parties or other stakeholders.

Thank you!
-Clint

Matthew McPherrin

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Oct 22, 2025, 3:01:15 PMOct 22
to Clint Wilson, ct-p...@chromium.org
In order to be able to try out the schemas and read them in something with nicer indentation than the doc, I've checked the schemas and examples into a repository at https://github.com/mcpherrinm/ctmeta

There is also a schema verification tool included now, and depending on how the discussion goes, may add a few more small tools for working with these files.

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