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.su/cert.pem{,.asc}
$ 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

$ [fetch|wget] http://www.ca.cypherpunks.su/stargrave@stargrave.org.pub{,.asc}
$ [fetch|wget] http://www.ca.cypherpunks.su/cert.pem.sig
$ gpg --verify stargrave@stargrave.org.pub.asc
$ ssh-keygen -Y verify -f stargrave@stargrave.org.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