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Managing identity and privacy online is more complex than ever. In this section, we explore how blockchain technology enables individuals to own and protect their digital identities securely. You will learn about decentralized identifiers (DIDs), self-sovereign identity, and privacy-preserving tools that help users stay in control of their personal information.
We also discuss the broader impact of these innovations on trust, access to services, and data protection in a digital-first world. This chapter provides essential knowledge for navigating privacy and identity in the age of blockchain.

What is self-sovereign digital identity?

DIDs (Decentralized Identifiers): how they work

Verifiable Credentials (VCs) in Web3

Biometrics on blockchain: ethical dilemmas

Examples of identity in crypto projects (Civic, Polygon ID)

How is privacy protected in these systems?

What is selective privacy in blockchain?

Privacy and pseudonymity on public chains

Use cases: voting, decentralized KYC
