The account opening form is a contract between User (You) and Dhan (Moneylicious Securities Private Limited) Which is registered with SEBI as a broker and Depository Participant and Member of BSE,NSE and MCX. 

The company Grey Swift Private Limited (Leegality) is a service provider that provisions eSign as a software that is enabled via Protean (earlier NSDL) which runs the Aadhaar enabled eSign infrastructure. We use Leegality to enable eSign process.