Using cryptography and distributed ledger blockchain technology it is now possible to secure a zero-sum cryptographic proof of identity, and control who you share your information with. Hyperlegder indy is completely open source and puts people — not the organizations that traditionally centralize identity — in charge of decisions about their own privacy and disclosure. This enables all kinds of rich innovation: connection contracts, revocation, novel payment workflows, asset and document management features, creative forms of escrow, curated reputation, integrations with other cool technologies.
https://github.com/hyperledger/indy-sdk/blob/master/doc/getting-started/getting-started.md#what-indy-and-libindy-are-and-why-they-matter