I have a 256bit signature and a certificate with a public key to verify it. I had little information about the signature scheme used, but I know now that it's "ECBNwithSHA256". I have never come across these Barreto-Naehrig Curves until now. My question to the community is: The certificate contains two point pairs (each 32 bytes) as the public key.
Can someone explain to me why the public key consists of 4 points here? This is a Screenshot of the certificate: