}
    }
    
    public WitnessRegisterResponse register(WitnessRegisterRequest request) throws IOException {
        try {
            WitnessRegisterStub stub = new WitnessRegisterStub(request);
            handle.sendrecv(stub);
            return stub.getResponse();
        } catch (Exception e) {
            throw new IOException("Witness register RPC failed", e);
        }