https://blog.cloudflare.com/introducing-certificate-transparency-and-nimbus/ https://blog.cloudflare.com/introducing-certificate-transpar... is a very good over

https://blog.cloudflare.com/introducing-certificate-transparency-and-nimbus/ https://blog.cloudflare.com/introducing-certificate-transpar... is a very good overview of Certificate Transparency. I've written my own Certificate Transparency monitor called Cert Spotter. I use both the standalone open source version (https://github.com/SSLMate/certspotter https://github.com/SSLMate/certspotter) and the hosted service (https://sslmate.com/certspotter https://sslmate.com/certspotter) to monitor my own domains as well as several test/example domains (example.com, test.com, etc.).