Blockchain-Based Identity Systems: A Comparative Analysis

(Cardano, Ethereum, Polygon, KILT, Identus)

Cardano

• Focus on regulatory compliance and identity-layer privacy.

• Partners with Identus and Midnight for DID and ZK identity management.

Ethereum

• Used by projects like uPort and SpruceID.

• Flexible smart contract system supports Verifiable Credential issuance and verification.

Polygon

• Scalable Ethereum-compatible chain with Verite and Polygon ID.

• Enables private proof generation and credential verification.

KILT Protocol

• Built on Polkadot for Web3 credentials and reputation systems.

• Allows issuance of claim-based identities.

Identus (Cardano-based)

• Built for SSI-compliant credential issuance with strong W3C alignment.

• Integrates into Fairway Wallet and other regulated ID solutions.

Cheqd

• Focused on decentralized credential monetization.

• Offers DID & VC support with incentive layers and trust registries.

🔗 Sources:

• Cardano Atala PRISM: https://www.atalaprism.io/

• Polygon ID: https://polygon.technology/polygon-id

• KILT Protocol: https://www.kilt.io/

• Cheqd: https://cheqd.io/

• Identus: https://www.identus.org/