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The amount of sensitive information that service providers handle about theirusers has become a concerning fact in many use cases, where users have no otheroption but to trust that those companies will not misuse their personalinformation. To solve that, Self-Sovereign Identity (SSI) systems have become ahot topic of research in recent years: SSI systems allow users to manage theiridentities transparently. Recent solutions represent the rights of users to useservices as Non-Fungible Tokens (NFTs) stored on Blockchains, and users provepossession of these rights using Zero-Knowledge Proofs (ZKPs). However, evenwhen ZKPs do not leak any information about the rights, the NFTs are stored aspublic values linked to known accounts, and thus, they can be traced. In thispaper, we design a native privacy-preserving NFT model for the Dusk NetworkBlockchain, and on top of it, we deploy Citadel: our novelfull-privacy-preserving SSI system, where the rights of the users are privatelystored on the Dusk Network Blockchain, and users can prove their ownership in afully private manner.

Citadel: Self-Sovereign Identities on Dusk Network