# Blockchain-Based Identity Systems: A Comparative Analysis

#### **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/>


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