That is the principle purpose of which this (Aadhaar) was intended to be used and that is where the interplay of over a billion Aadhaar number, over a billion bank accounts and mobile phones itself has an important role,” the Fince Minister said. Jaitley said that once the identity network is created through Aadhaar, it is used to make sure the social benefits reach those segments of population for whom it is specifically targeted. “There are important questions which arise and therefore (Aadhaar) legislation was necessary and because of evolving detail, the confidentiality of the data and to build some iron wall around the data itself was also equally important,” he said.