Verifiable Credentials &
Zero Knowledge Proofs

From Siloed Verification to Reusable Identity

Today, verifying identity is fragmented, costly, and friction-heavy. The same person undergoes repeated verification across different banks, platforms, and jurisdictions — each time submitting documents, waiting for manual checks, and exposing personal data to new databases. Verifiable Credentials fundamentally change this by making verified identity data portable, reusable, and cryptographically secured.

Built on the W3C Verifiable Credentials Data Model, these are tamper-proof digital files containing verified identity data that can be instantly checked for authenticity by any verifier, anywhere in the world — without contacting the original issuer.

How the Trust Model Works

At the heart of verifiable credentials is a three-party trust model that eliminates centralized databases:

• Issuer — The trusted entity (government, telecom operator, bank, university) that creates and cryptographically signs a credential based on verified data. The issuer's digital signature makes the credential tamper-proof
• Holder — The individual who receives and stores their credentials in a secure digital identity wallet on their phone or cloud. The holder decides what to share and with whom
• Verifier — The entity (social media platform, employer, financial institution) that requests and verifies the credential. Verification is instant and cryptographic — no phone calls, no manual checks, no waiting

Zero Knowledge Proofs: Prove Without Revealing

Zero Knowledge Proofs enable proving that a claim is true without revealing any information beyond the truth of the statement itself. Combined with BBS+ signatures and Selective Disclosure, this means:

• Age Verification — Prove you are over 18 without revealing your date of birth
• Income Qualification — Prove your income exceeds a threshold without revealing the exact amount
• Professional Licensing — Prove you hold a valid license without exposing the license number
• Nationality Confirmation — Prove citizenship of a specific country without exposing passport details

Practical Applications

Technology Foundation

• W3C Verifiable Credentials 2.0 — The global standard for digital credential interoperability
• Decentralized Identifiers (DIDs) — Globally unique identifiers created and controlled by the user without dependence on any central authority
• BBS+ Signatures — Enabling selective disclosure from signed credentials without invalidating the cryptographic proof
• SD-JWT — Selective Disclosure JSON Web Tokens for standards-based selective disclosure
• OpenID for Verifiable Credentials (OID4VC/OID4VP) — Standard protocols for credential issuance and presentation