This CA is solely under control of Sergey Matveev. Look here for trust anchors to verify the signatures below. 
$ [fetch|wget] http://www.ca.cypherpunks.ru/cert.pem
$ [fetch|wget] http://www.ca.cypherpunks.ru/cert.pem.{asc,sig}
$ gpg --auto-key-locate dane --locate-keys stargrave@stargrave.org
$ gpg --auto-key-locate wkd --locate-keys stargrave@stargrave.org
$ gpg --auto-key-locate wkd --locate-keys stargrave@gnupg.net
$ gpg --check-sigs stargrave@stargrave.org
$ gpg --verify cert.pem.asc
$ echo stargrave@stargrave.org ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILPuHzjfrYfgcZ6pv2e/JtacNzFG3t1KQ6gRjyZtkHl3 > cert.pem.pub
$ ssh-keygen -Y verify -f cert.pem.pub -I stargrave@stargrave.org -n file -s cert.pem.sig < cert.pem

$ git config http.sslCAInfo `pwd`/cert.pem
$ export SSL_CERT_FILE=`pwd`/cert.pem