# Circular's Public Blockchains

The Circular network hosts multiple interconnected blockchains that coexist to support a wide range of use cases. The primary blockchain is divided into two distinct branches, each serving different functions within the network:

## Circular Public

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<mark style="color:blue;">**Circular Public**</mark> is the primary blockchain where most standard transactions take place. For exchanges integrating CIRX, the <mark style="color:blue;">**Circular Main Public**</mark> branch will be the key focus for integration. While fully interoperable with the main branch, the <mark style="color:blue;">**Secondary Branch**</mark> is designated for specific operations and use cases, distinct from the main transactional activities.

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**Circular Main Public**

0x714d2ac07a826b66ac56752eebd7c77b58d2ee842e523d913fd0ef06e6bdfcae
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**Circular Secondary Public**

0xacb8a9b79f3c663aa01be852cd42725f9e0e497fd849b436df51c5e074ebeb28&#x20;
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## Circular Documark Public

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Circular Documark is fully interoperable with the <mark style="color:blue;">**Circular Public Blockchain**</mark> but is specifically designed for secure certificate storage using <mark style="color:blue;">**Zero-Knowledge Proof (ZKP)**</mark>. While it can also be utilized for typical crypto transactions, its primary function is to serve as a specialized blockchain for certification and document storage.

{% hint style="info" %}
**Circular Documark Public**

0xe087257c48a949710b48bc725b8d90066871fa08f7bbe75d6b140d50119c481f&#x20;
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## Circular Sandbox

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<mark style="color:blue;">**Circular Sandbox**</mark> is the designated training blockchain within the Circular network. It operates with its own supply of CIRX, which is not interoperable with the other blockchains. Available on both testnet and mainnet, the Sandbox provides a safe environment for testing transactions and smart contracts before deploying them on the live blockchains with real digital assets.

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**Circular Sandbox**

0x8a20baa40c45dc5055aeb26197c203e576ef389d9acb171bd62da11dc5ad72b2&#x20;
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