Selective Disclosure Credentials: A Privacy-First KYC

Key Takeaway 1 Selective Disclosure Credentials (SDCs) allow users to prove claims about themselves (e.g., age, address) without revealing the underlying data itself, enhancing privacy.

Key Takeaway 2 Zero-knowledge proofs are the cryptographic foundation of SDCs, providing verification without information disclosure.

Key Takeaway 3 SDCs address the data minimization principle of GDPR and other privacy regulations, reducing the risk of data breaches and misuse.

Key Takeaway 4 Didit is pioneering the integration of SDCs into its identity platform, offering a more secure and user-centric KYC/AML process.

Understanding the Limitations of Traditional KYC

Traditional Know Your Customer (KYC) processes are often criticized for their privacy implications. Users are typically required to submit extensive personal documentation – passports, driver’s licenses, utility bills – to various service providers. This creates a fragmented landscape of sensitive data, increasing the risk of data breaches and identity theft. Furthermore, businesses accumulate massive databases of PII (Personally Identifiable Information), making them attractive targets for cyberattacks and subject to stringent regulatory compliance burdens. Each verification often requires 10+ data points, even if the service only needs to confirm a single attribute, such as age. This oversharing of information is not only a privacy concern but also inefficient and costly.

Introducing Selective Disclosure Credentials (SDCs)

Selective Disclosure Credentials (SDCs) represent a paradigm shift in digital identity verification. Built on the principles of self-sovereign identity (SSI) and powered by zero-knowledge proofs (ZKPs), SDCs enable individuals to selectively share verifiable claims about themselves without revealing the underlying data. Imagine proving you are over 21 without disclosing your exact date of birth, or confirming your residency in a specific country without revealing your full address. This is the core functionality of SDCs.

At the heart of SDCs lies the concept of a verifiable credential. This is a digitally signed statement issued by a trusted authority (the issuer) attesting to a specific claim about an individual (the holder). However, unlike traditional credentials, SDCs utilize ZKPs to allow the holder to prove the validity of the claim without revealing the credential itself. For example, a university could issue a verifiable credential stating a student has a degree. The student could then use an SDC to prove they hold a degree to a potential employer without revealing the university's name, the degree type, or the graduation date.

How Zero-Knowledge Proofs Enable Privacy

Zero-knowledge proofs are a cryptographic technique that allows one party (the prover) to prove to another party (the verifier) that a statement is true, without conveying any information about why it is true. A classic analogy is the “Ali Baba Cave” example: Peggy wants to prove to Victor she knows the secret word to open a magical cave door. She can enter the cave, go down either path, and Victor can choose which path she emerges from. If Peggy knows the secret word, she can always emerge from the path Victor chooses. If she doesn’t, she has a 50% chance of being caught. This demonstrates knowledge without revealing the secret itself.

In the context of SDCs, ZKPs enable the holder to generate a proof of a specific attribute within a verifiable credential. This proof can be verified by the relying party (e.g., a business conducting KYC) without requiring access to the original credential or the underlying data. Several ZKP schemes are used in SDC implementations, including:

• zk-SNARKs (Zero-Knowledge Succinct Non-Interactive Argument of Knowledge): Offer very short proof sizes but require a trusted setup.
• zk-STARKs (Zero-Knowledge Scalable Transparent Argument of Knowledge): More scalable and don't require a trusted setup, but typically generate larger proof sizes.

Implementing SDCs in KYC/AML Compliance

The application of SDCs to KYC/AML processes offers significant benefits. Consider a scenario where a financial institution needs to verify a customer's age for regulatory compliance. Instead of requesting a full copy of the customer’s passport, the institution could request an SDC attesting to the fact that the customer is over 18. The customer can then present a ZKP-based proof, verifying their age without revealing their exact date of birth or other sensitive information. This minimizes data exposure and complies with data minimization principles.

Furthermore, SDCs can streamline the KYC process. A user could obtain a verified credential from a government authority (e.g., a national ID card) and then selectively disclose specific attributes to multiple service providers, avoiding the need to repeatedly submit the same documentation. This reduces friction for users and lowers operational costs for businesses. Early adopters are seeing verification times reduce by 60% and manual review rates drop by 40%.

How Didit Helps

Didit is at the forefront of integrating SDCs into its identity platform. We are building the infrastructure to enable businesses to issue, hold, and verify SDCs seamlessly. Our approach includes:

• Wallet Integration: Support for popular digital wallets that enable users to securely store and manage their SDCs.
• Credential Issuance: Tools for trusted authorities to issue verifiable credentials that can be used to generate SDCs.
• ZKP Integration: Implementation of efficient ZKP schemes to ensure fast and secure proof generation and verification.
• API Access: Developer-friendly APIs for integrating SDC functionality into existing applications.

Didit's platform reduces the reliance on centralized databases and empowers users with greater control over their personal data. This not only enhances privacy but also builds trust and fosters a more secure digital ecosystem. We’re currently piloting SDC based KYC flows with select partners, seeing up to a 70% reduction in data storage requirements.

Ready to Get Started?

Selective Disclosure Credentials are poised to revolutionize KYC and digital identity verification. By embracing this privacy-preserving technology, businesses can build trust, reduce risk, and unlock new opportunities. Request a demo to learn how Didit can help you implement SDCs and transform your identity verification processes. Explore our pricing plans and technical documentation to get started today.