String schemaName = "IdentityAuthentication";
        String schemaVersion = "1.2."+new Date().getTime();
        List<String> schemaAttributes = new ArrayList<>();
        schemaAttributes.add("name");
        schemaAttributes.add("birth_date");
        schemaAttributes.add("gender");
        schemaAttributes.add("mno");
        schemaAttributes.add("mobile_num");
        schemaAttributes.add( "is_foreigner");

        // Schema 생성하기
        String schemaId = ssi.createSchema(schemaName, schemaVersion, schemaAttributes).join();

        String credDefTag = "V1";

        // Credential Definition 생성하기
        shared.setDemoCredDefId(ssi.createCredentialDefinition(schemaId, credDefTag, false).join());
        return shared.getDemoCredDefId();