The code takes the CT hostname and tries to access a bunch of different buckets that might exist related to that hostname. So if you get a cert for foo.example.

The code takes the CT hostname and tries to access a bunch of different buckets that might exist related to that hostname. So if you get a cert for foo.example.com it will ask s3 if foo.example.com.s3.amazonaws.com and www-foo.example.com.s3.amazonaws.com exist.