Identity Index, an evolution in decentralized identity. Connect your keys, accounts, profiles, data, social graphs, and more across platforms. DIDs are the W3C standard for globally-unique decentralized identifiers that commonly identify an entity across the web. A DID is the minimum requirement for establishing an interoperable, platform-agnostic digital identity. However, a digital identity is much more than a decentralized identifier. An identity is the complete set of resources that give context and capability to a DID including all of its keys, accounts, profiles, social graphs, data, settings, services, and more. Oftentimes, these resources are scattered across the web on many different centralized platforms (application servers) and decentralized networks. Decentralized identity depends on the ability for users to bring their identifier and resources to an application, as opposed to the current "Web2" paradigm of applications and platforms controlling identities and data. However to date, this has not been possible. Currently there is no standardized and decentralized way of associating resources to a DID. This limits an application's ability to permissionlessly query, discover, and resolve a DID's many resources. In turn, this limits the value of decentralized identities. We believe this is one of the reasons "Web3" has not realized its full potential. Identity Index (IDX) is a standard for constructing an identity-centric index of resources. IDX is decentralized, cross-platform, and DID-agnostic so it can be used by any DID, to map to any resource, on any platform. By standardizing how resources are associated to a DID, IDX solves discovery, routing, and resolution. This enables any app to lookup a DID and seamlessly interact with its resources regardless of where they exist or which application first created the data. As a result, IDX can unlock true identity-centric interoperability across the web. IDX achieves this by specifying a top-level resource directory, called the Root Index (CIP-12), which links to various subdirectories including a Profiles Index (CIP-13), Keychains Index (CIP-15), Accounts Index (CIP-14), Connections Index (CIP-18), Collections Index (CIP-16), Services Index (CIP-17), Settings Index (CIP-24) and more.