e-KYC setu authentication permitted under Aadhaar Act, enabling identity verification without disclosing full Aadhaar number. The notification permits entities onboarded under the Aadhaar Act to use the e-KYC setu system for section 11A purposes if the system meets Aadhaar privacy and security standards; NPCI will enable authentication without disclosing full Aadhaar numbers and will share digitally signed demographic details and the last four digits of Aadhaar with reporting entities, while NPCI and UIDAI must ensure compliance, maintain lists of onboarded and discontinued entities, and notify regulators of such actions within seven days.