Discover the benefits, pillars and how it work the SSI or self sovereign dentity system of ddigital identity

Self Sovereign Identity (SSI)

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The Decentralized Digital Identity System

Self Sovereign Identity (SSI) represents a paradigm shift in digital identity management, offering individuals, organizations, and devices unprecedented control over their digital personas and personal data. This comprehensive guide delves deeper into the technical intricacies of SSI, exploring its conceptual foundations, benefits, and problem-solving capabilities. For a more detailed understanding, we’ve referenced key sources from the World Wide Web Consortium (W3C) and relevant insights from the Extrimian blog.

Technical Foundations of SSI

Decentralized Identifiers (DIDs)

Decentralized Identifiers (DIDs) serve as the linchpin of SSI. These globally unique, cryptographically verifiable identifiers are built on decentralized networks or blockchains. DIDs enable users to establish their digital presence while eliminating the need for central authorities or intermediaries. They offer immutability and resilience, enhancing the security and reliability of digital identities.

DID Specification by W3C

*Illustration: Decentralized Identifiers W3C Syntax.

Verifiable Credentials (VCs)

Verifiable Credentials (VCs) are the digital equivalents of traditional attestations or claims, such as educational diplomas, driver’s licenses, or memberships. VCs are cryptographically signed by trusted entities and can be selectively disclosed by users to prove specific attributes or qualifications without divulging sensitive information. The W3C has developed a comprehensive data model for VCs.

Verifiable Credentials Data Model by W3C

*Illustration: Verifiable Credential circuit.

Zero-Knowledge Proofs (ZKPs)

Zero-Knowledge Proofs (ZKPs) are cryptographic techniques that enable one party to prove knowledge of certain data to another party without revealing the data itself. Within the SSI context, ZKPs play a pivotal role in ensuring privacy. They allow users to authenticate or validate claims without exposing personal information, thus safeguarding user privacy and data integrity.

Zero-Knowledge Proofs on W3C

Conceptual Framework


Self-Sovereign Identity places individuals at the helm of the identity ecosystem. This paradigm shift empowers users to assert control over their digital identities, determining what information to share and with whom. The user-centric approach redefines the relationship between individuals and their digital personas, fostering autonomy and consent.


Decentralization forms the backbone of SSI, eradicating central authorities and intermediaries. The utilization of DIDs and VCs on decentralized networks grants users full control over their digital identities. This decentralization enhances security, resilience, and user empowerment.

Benefits of SSI decentralization

Privacy and Data Sovereignty

SSI’s selective disclosure capabilities and cryptographic security protocols bolster privacy and data sovereignty. Users can divulge only essential information, mitigating the risk of personal data exposure. This aligns with evolving data protection regulations, preserving individuals’ control over their personal information.

Self Sovereign Identity Interoperability

SSI solutions are inherently interoperable. Users can fluidly employ their digital identities across diverse platforms and services without the need for multiple accounts. This seamless interoperability enhances user convenience and streamlines online interactions.

Certainly, the trust triangle is a fundamental concept in Self-Sovereign Identity (SSI) that underscores the principles of trust and security within the ecosystem. Here’s a paragraph that explains the trust triangle in SSI:

Trust Triangle in SSI: 

Self-Sovereign Identity (SSI) operates on the foundation of the trust triangle, which comprises three essential elements: the Identity Holder, the Verifier, and the Issuer. The Identity Holder represents individuals or entities who assert control over their digital identities. Verifiers are the parties that seek verification of specific attributes or claims presented by the Identity Holder. Issuers are trusted entities that issue verifiable credentials, such as universities granting diplomas or government agencies issuing identification documents. 

The trust triangle emphasizes that trust in the SSI ecosystem is not placed in a centralized authority but distributed among these three parties. Identity Holders have trust in Verifiers to accurately verify their claims, while Verifiers trust the Issuers to issue valid and authentic credentials. This distributed trust model enhances security, privacy, and user control in digital identity transactions.

*Illustration: Trust Triangle Self-Sovereign Identity (SSI).

Security and Trust

The incorporation of cryptographic signatures, DIDs, and ZKPs fortifies security and trust within the SSI ecosystem. Users can trust the authenticity of digital identities and claims, reducing the susceptibility to fraud and identity-related incidents.

Problem-Solving Capabilities

Identity Fragmentation

Traditional identity systems often lead to identity fragmentation, with individuals managing numerous accounts and credentials across various services. SSI addresses this issue by providing a unified, user-centric digital identity that effortlessly integrates into different applications and contexts.

Centralized Control

Centralized identity systems raise concerns about data privacy and security breaches, as centralized authorities hold significant control. SSI empowers individuals to reclaim control over their digital identities, reducing the influence of intermediaries and enhancing individual autonomy.

More about Self Sovereign Identity System and Decentralized Technologies

Learn more about technology and digital identity system with the Extrimian Academy in this lessons:

For further insights into Self-Sovereign Identity (SSI) and its practical applications, explore relevant blog posts and resources on the Extrimian Blog. These articles provide real-world perspectives on SSI implementation and its impact on the digital identity landscape.

*Illustration: Current ID System vs. Self-Sovereign Identity (SSI).