The document discusses using IoT and blockchain solutions to address issues with street lighting in Jaipur, India and privacy with Aadhaar authentication. It notes that Jaipur has 198,000 street lights that use around 30,000 MW of energy annually at a cost of 1.13 billion rupees. A proposed IoT-based street light system could save up to 50% of energy costs through controlled dimming and switching based on sensors. It also proposes a blockchain solution to provide an auditable record of all Aadhaar authentications while maintaining individual privacy.