The bitcoin blockchain doesn't need to contain every SSL certificate. It just needs to contain a SINGLE transaction conducted each day where the comment field c

The bitcoin blockchain doesn't need to contain every SSL certificate. It just needs to contain a SINGLE transaction conducted each day where the comment field contains the hash of a document published by the root authority. That document would be published elsewhere (on the site of the owner of the root certificate) -- the bitcoin blockchain would be used only to provide proof that the document hadn't been changed since it was published.