The Aadhaar program in India has gone much farther than just a direct benefit transfer scheme.
Aadhaar is used as a 2nd Factor Authentication
You can make payments using only Thumb - as Aadhaar card (social security number) is linked to bank accounts
Adhaar is also linked to KYC database
the eKYC has reduced the documentation (lengthy paper process) and reduced time from some days to some minutes
The government is taking every step to securely manage the database for 1.2 billion Indians, it has organized numerous hack-a-thons for companies to participate and attempt to break open...
Now, the government is planning to tackle issues of black money by linking aadhaar to income tax....
Technology + Conscience has a long future
following you now.. :)