WhatsApp, ordered by the Centre not to roll out its username feature without clarifying the matter, said today that it has put in place multiple layers of defence to address the very concerns the government has. In an exclusive interview with NDTV Profit a WhatsApp spokesperson said the really high-profile names — public figures, government entities and celebrities — have been withheld so they can be claimed by legitimate owners. Lookalike derivatives of known names have been withheld as well.