IDentix: Blockchain-Based Decentralized Identity Verification System

Abstract

Abstract— Traditional identity systems rely on centralized authorities, which creates single points of failure and privacy risks. We propose IDentix, a decentralized identity framework leveraging blockchain and cryptography to secure user credentials while preserving privacy. In IDentix, each user owns a self-sovereign identity (SSI) represented by a public/private key pair and a Decentralized Identifier (DID) registered on an Ethereum smart contract. Trusted issuers (e.g. governments, banks) provide verifiable credentials (VCs) to users off-chain, and users present cryptographic proofs (such as zero-knowledge proofs) of specific attributes to verifiers. Verifiers authenticate credentials by checking issuer signatures against public keys on the blockchain and querying an immutable credential registry. Our prototype on the Ethereum Sepolia testnet demonstrates that this design yields tamper-evident identity proofs without exposing personal data. As shown in prior work [1], blockchain-based SSI greatly reduces risks of identity theft while giving users full control over their data. Keywords— Blockchain; decentralized identity; self-sovereign identity; verifiable credentials; decentralized identifiers; identity verification; Ethereum; zero-knowledge proof.