Decentralized Identity (DID) and Verifiable Credentials Explained
Salman Haider
TelGates Team
The current model of digital identity (logging in with Google/Facebook) is broken. Decentralized Identity puts users back in control of their data.
What are DIDs?
A Decentralized Identifier (DID) is a globally unique identifier that does not require a centralized registry. It looks like this: `did:ethr:0x123...`. The user holds the private key associated with this DID, proving ownership.
Verifiable Credentials (VCs)
A VC is a digital, cryptographically signed version of a physical credential (like a passport or university degree). 1. Issuer: A university issues a VC stating "Alice has a CS Degree". 2. Holder: Alice stores this VC in her digital wallet. 3. Verifier: An employer asks Alice to prove her degree. Alice shares the VC. The employer verifies the university's cryptographic signature.
Zero-Knowledge Proofs in Identity
Combining VCs with Zero-Knowledge Proofs allows for selective disclosure. If a bar needs to know you are over 21, you can use a ZK-proof on your digital ID to prove `age > 21` without revealing your actual birthdate or name.
Building DID Applications
At TelGates, we implement DID solutions using frameworks like Polygon ID and Spruce. These solutions are critical for Web3 applications requiring Sybil resistance and compliance without compromising user privacy.