Certificate Transparency. Both Chrome and Safari implement it and you will receive an e-mail from Cloudflare if someone creates a certificate for your domain:

Certificate Transparency. Both Chrome and Safari implement it and you will receive an e-mail from Cloudflare if someone creates a certificate for your domain: It is kind of a blockchain with proof of authority. More precisely it is a Merkle tree with certificate authorities seen as trusted nodes by the web browsers. This idea was extended in something called General Transparency and implemented in the Google Trillian project: https://sites.google.com/site/certificatetransparency/general-transparency https://sites.google.com/site/certificatetransparency/genera...