Self-Sovereign Identity Explained

As the famous 1993 cartoon saying goes, “On the internet, nobody knows you’re a dog.” This iconic phrase still captures a core challenge of the digital world: verifying identity online remains difficult. In today’s digital economy, this lack of reliable identity verification creates friction across many business processes, from confirming legal representatives and authorised signatories to validating company credentials. Without a secure and trustworthy way to prove who is who, digital collaboration becomes slow, risky, and difficult to scale. These gaps are actively exploited, with cybercrime projected to cost the global economy $10.5 trillion annually by 2025, highlighting the scale and profitability of attacks that steal payment and identity data unnoticed.

SSI fundamentally changes how digital trust works. By giving individuals, organisations, and companies direct control over their digital identities, SSI enables secure, verifiable, and privacy-first interactions. In this article, we explain what Self-Sovereign Identity is, how it works, why it matters, and how businesses can benefit from it.

What Is the Self-Sovereign Identity (SSI) Concept?

Self-Sovereign Identity (SSI) is a digital identity model built on a simple principle: identity is no longer something you log into, but something you control and use: securely and on demand. This applies equally to individuals, organisations, and enterprises. Instead of relying on centralised databases or intermediaries, SSI allows identity owners to hold trusted digital credentials themselves and present them selectively when needed.

The idea behind SSI is not entirely new. Early concepts of decentralised trust can be traced back to the Web of Trust introduced with Pretty Good Privacy (PGP), as well as academic work exploring identity systems without centralised certification authorities. These ideas gained renewed momentum in the mid-2010s, as the digital identity and cryptography community actively sought alternatives to password-based systems and centralised identity providers. The goal was to create a model that reflects real-world identity interactions: credentials are issued by trusted authorities, carried by the identity owner, and presented selectively depending on the context, using cryptography and decentralised technologies to enable this securely.

How SSI Works: The Trust Triangle Explained

At the core of Self-Sovereign Identity is a simple interaction model known as the Trust Triangle. This model explains how trust can be established digitally without centralised intermediaries, and it consists of three clearly defined roles working together:

• Issuer: a trusted entity, such as a government authority or business registry, that verifies information and issues a verifiable credential.

• Holder: an individual or organisation that receives and manages the credential in a secure digital identity wallet.

• Verifier: a third party, such as a bank, regulator, or business partner, that needs to confirm the credential’s authenticity.
  

Each participant plays a distinct role in establishing trust, without repeated manual checks or unnecessary data sharing.

Use Case: Opening a Bank Account with SSI

Imagine an individual applying to open a bank account, where the bank must verify the person’s identity before the account can be created.

Holder: Maria, a citizen opening a bank account

Issuer: A government authority issuing identity credentials

Verifier: A bank offering current and savings accounts

Step 1: Issuer

A trusted public authority verifies Maria’s identity and issues her a verifiable digital credential, which is stored in her digital identity wallet.

Step 2: Holder

Maria remains in control of her data. When opening the bank account, she shares only the information required: nothing more.

Step 3: Verifier 

The bank instantly verifies the credential’s authenticity and opens the account, without manual checks or storing sensitive identity data.

Because the bank trusts the issuer and Maria controls her data, the process is faster, privacy-preserving, and resistant to fraud. Any attempt to tamper with the credential would fail verification immediately, as the cryptographic signature would no longer match the issuer’s identity.

How Businesses Can Benefit from Self-Sovereign Identity

Self-Sovereign Identity provides organisations with a reliable and scalable way to establish trust digitally, supporting both internal processes and external interactions.

• Easier digital onboarding and access: SSI allows businesses to rely on verified identity information when granting access to services, platforms, or processes, reducing friction for customers, partners, and employees.

• More efficient business processes: By enabling identity data to be verified once and reused, SSI helps streamline interactions across departments, partners, and ecosystems, saving time and effort.

• Reduce fraud and impersonation risk: Cryptographically verifiable credentials make it easier for organisations to trust digital information, reducing the risk of fraud, impersonation, and errors in identity-related decisions.

• Better handling of sensitive data: SSI supports selective sharing of information, helping businesses limit the amount of personal or organisational data they receive, store, and manage.

• Future-ready digital interoperability: SSI enables identities to work across systems and borders, helping organisations prepare for interoperable digital ecosystems and evolving regulatory and market requirements.

  
  

Why Act Now

Europe has already taken important steps toward user-centric, secure, and interoperable digital identity through initiatives such as the EU Digital Identity Wallet, EU Digital Identity Wallet Consortium and the eIDAS Regulation toward enterprise-ready digital identity frameworks. Spherity contributes to this ecosystem by providing an eIDAS-compliant solution, the European Business Wallet (EIDA).

Visit Spherity’s European Business Wallet (EIDA) to discover how Spherity can support your organization’s business processes or contact us to learn more.