인증서 투명성 API

{
  "domain": "example.com",
  "certificates": [
    {
      "issuer": "Let's Encrypt",
      "serial": "0a:1b:2c:3d:4e:5f",
      "not_before": "2024-01-01T00:00:00Z",
      "not_after": "2024-04-01T00:00:00Z",
      "san": ["example.com", "www.example.com"],
      "fingerprint_sha256": "AB:CD:EF..."
    }
  ],
  "total_certificates": 1,
  "has_valid_cert": true
}