code: def verify_signature(uid, signed_cert_file_name, issuing_address):
      
  
      logging.info('verifying signature for certificate with uid=%s:', uid)
      with open(signed_cert_file_name) as in_file:
          signed_cert = in_file.read()
          signed_cert_json = json.loads(signed_cert)
          to_verify = uid
          signature = signed_cert_json['signature']
          verified = verify_message(issuing_address, to_verify, signature)
          if not verified:
              error_message = 'There was a problem with the signature for certificate uid={}'.format(uid)
              raise UnverifiedSignatureError(error_message)
  
          logging.info('verified signature')
docs: Verify the certificate signature matches the expected. Double-check the uid field in the certificate and use
      VerifyMessage to confirm that the signature in the certificate matches the issuing_address.
  
      Raises error is verification fails.
  
      Raises UnverifiedSignatureError if signature is invalid
  
      :param uid:
      :param signed_cert_file_name:
      :param issuing_address:
      :return: