Aadhaar signature is a revolutionary way to digitally sign documents that allow individuals to sign their documents by using their Aadhaar number. eSign Aadhaar is a government-backed initiative that brings security and transparency to the world of digital signatures. To sign a document using Aadhaar eSign, individuals must have a valid Aadhaar number linked with a registered mobile number. Along with that, these signatures hold the same legal validity as traditional ink-based signatures, so that one can sign their official documents as well.