Decentralized Identity (DID) is an architectural change in how identity, credentials, and reputation are managed, moving control away from centralized tech companies and back into the hands of the individual user. In Web2, identity is heavily fractionalized and rented; you sign into services using Google, Facebook, or Apple credentials, and these mega-corporations retain absolute power to monitor, restrict, or entirely revoke your digital existence at their sole discretion. A DID flips this dynamic. It assigns an individual a unique, cryptographically verifiable identifier stored on a blockchain or distributed ledger, securely anchored by their own private key. Users then collect Verifiable Credentials (VCs) - such as a university degree, a government ID, or credit history - issued to their DID. Because this system uses Zero-Knowledge Proofs, users can selectively disclose information. For instance, you can cryptographically prove to a smart contract that you are over 18 years old or reside in a specific jurisdiction without ever revealing your actual date of birth, name, or address. DIDs form the fundamental base layer required to enable undercollateralized DeFi lending, decentralized social media, and sybil-resistant democratic governance.
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