* be at least 2 characters long, and contain only valid, lower-cased hexadecimal characters.
   *
   * <p>This method accepts the exact format generated by {@link #toString}. If you require more
   * lenient {@code base 16} decoding, please use {@link com.google.common.io.BaseEncoding#decode}
   * (and pass the result to {@link #fromBytes}).
   *
   * @since 15.0

  // does not indicate otherwise, the first block is the issued certificate,
  // and subsequent blocks should be treated as intermediate certificates and presented in TLS handshakes.
  //
  // The certificate is encoded in PEM format.
  //
  // When serialized as JSON or YAML, the data is additionally base64-encoded, so it consists of:
  //
  //     base64(
  //     -----BEGIN CERTIFICATE-----
  //     ...
  //     -----END CERTIFICATE-----

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