In today’s world, our digital identities are present in multiple platforms in the form of normal accounts, social media accounts or bank logins. And in almost all of these cases we don’t own or control them: the sad reality is that big corporations and governments manage them for us, creating quite a few concerns around privacy.
This is where Self-Sovereign Identity (SSI) comes in: it’s a decentralized approach to digital identity that gives back power to individuals to own and control their personal information without relying on intermediaries.
The concept behind SSI needs a bit of a deep-dive in order to be explained, so let’s get into it.
What is Self-Sovereign Identity?
Self-Sovereign Identity is a digital identity model where individuals have full control over their personal data. Unlike traditional identity systems managed by centralized authorities (governments, banks or social media platforms), SSI allows users to manage their credentials securely without needing a third party’s permission.
With SSI you store your digital credentials (like your passport, university degree or driver’s license) in a decentralized digital wallet. You can then share a so called verified proof of your credentials without revealing unnecessary personal data (this concept is called selective disclosure).
Lets make an example: lets say you want to enter a club or a casino and need to prove you’re over 18. You don’t have to show your ID, revealing also other sensitive information. What you would do instead, is share a cryptographic proof stating only that you’re of legal age, without revealing your birth date, name or any other details.
Sounds cool right? Thats because it is. But how does it work exactly?
SSI relies on three key technologies:
- Decentralized Identifiers (DIDs): these are unique, verifiable digital identities stored on a blockchain such as Cardano or Ethereum or a Distributed Ledger (DLT) such as Hedera.
- Verifiable Credentials (VCs): these are digital proofs of identity (for example a digital diploma) issued by trusted entities and stored in your digital wallet.
- Blockchain or Distributed Ledger Technology (DLT): Ensures the integrity and immutability of identity-related transactions without a central authority, and its used to verify your identity without any intermediaries.
Self-Sovereign Identity (SSI) is designed to reflect real-world interactions as closely as possible.
Imagine you turn 18 and want to obtain your driver’s license. In the real world, you would visit the DMV, a well-known and trusted institution. In SSI this role is referred to as a Trusted Issuer (an entity authorized to issue credentials).
Once you receive your driver’s license (Credential), you are legally allowed to drive. Now, suppose a police officer stops you for a routine check. The officer is easily identifiable by their uniform, badge and patrol car. In SSI this role is known as the Verifier.
The officer asks you to present your driver’s license (he is requesting a specific credential not than unrelated documents like your golf club membership). In digital terms, this is called a Credential Presentation Request, which specifies the exact information the driver (or, in digital identity terms, the Holder) must provide.
In the real world, you would reach for your wallet and hand over your driver’s license, issued by the DMV. In SSI you would use your digital wallet to select and share only the required data from your credential. This process of securely proving your identity while maintaining control over your data is called a Verifiable Presentation.
The Three Key Players in SSI
- Issuer: The entity that provides verifiable credentials (e.g., a university issuing a digital diploma).
- Holder: The individual who stores and manages their credentials (e.g., a student keeping their diploma in a digital wallet).
- Verifier: A third party that requests proof of credentials (e.g., an employer verifying a diploma).
Real-World Applications of SSI
SSI is already being explored across various industries, including:
- Finance: KYC (Know Your Customer) processes without having to share sensitive data multiple times.
- Healthcare: Secure and portable patient records. This can come in handy when you switch doctors or even country, all your health data can follow you wherever you go and be instantly accessed by any doctor in the world under your approval.
- Education: Digital diplomas that employers can verify instantly. Think about the advantages and the cost cutting implications this can have with regards of doing background checks on applicants.
- Government Services: Digital passports and national IDs without centralized databases. No need to pay for centralized systems and their maintenance and security upgrades. The data is in the holder’s digital wallet and the DID is in the blockchain.
The Challenges Ahead
While SSI offers many advantages, adoption faces challenges, such as:
- Lack of Standardization: Different SSI frameworks need to work together seamlessly.
- Regulatory Compliance: Governments must adapt regulations to accommodate decentralized identity.
- User Adoption: Educating individuals and organizations on the benefits of SSI is crucial. Individuals need to take responsibility to have to manage their personal data without relying on third parties.
Despite these hurdles, SSI represents the future of digital identity: one where end users, not corporations or governments, have full control over their data.
Conclusion
Self-Sovereign Identity is a paradigm shift in how we manage digital identity. By leveraging blockchain and DLT technology, SSI provides a more secure and private alternative to traditional identity systems.
What are your thoughts on SSI? Was this article interesting to you?
Let me know in the comments section below.