Automatic checks against certificate transparency


We want to create a tool / plugin for certbot, that would automatically check a certificate transparency (CT) database and email a summary to contact emails, or even send alerts when the check discovers suspicious certificates.

Would it be of any interest? Or maybe it already exists?


Hi @DanCvrcek,

You might be interested in SSLMate’s “Certspotter” which can do similar CT validation alerts:


Hmm, thanks Daniel (@cpu), looks like a good starting point! And it seems to have raised some interest as well.



I can’t see any API specs for the second. Is there any?

Thanks Tom


@DanCvrcek I’m not aware of an API.

Another web service:


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