> For the complete documentation index, see [llms.txt](https://docs.cyclenetwork.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cyclenetwork.io/cycle-network-docs/quick-start/connect-to-cycle/connect-to-cycle-testnet/cycle-jellyfish.md).

# Cycle JellyFish

## **Introdction:**

JellyFIsh is a Comprehensive Upgrade of StarFish TestNet. Which launched july 7 2024. With cost-effective DAC integrated and further enhancement of network security, JellyFish has significantly optimized state synchronization efficiency and reduced synchronization costs while enhancing security.

## **Network:**

Cycle

| **ChainId** | **chainName**   | **Currency** | **NetworkId** |
| ----------- | --------------- | ------------ | ------------- |
| 1223        | Cycle JellyFish | ETH          | 1             |

Security Layer

| **ChainId** | **chainName** | **Currency** | **NetworkId** |
| ----------- | ------------- | ------------ | ------------- |
| 11155111    | Sepolia       | ETH          | 0             |

Extend Layer

| **ChainId** | **chainName**    | **NetworkId** |
| ----------- | ---------------- | ------------- |
| 10143       | Monad Testnet    | 16            |
| 5611        | opBNB Testnet    | 6             |
| 421614      | Arbitrum Sepolia | 4             |
| 11503       | BEVM Testnet     | 10            |
| 195         | X Layer Testnet  | 9             |

{% hint style="info" %}
Attention: Testnet is not suitable for long-term data storage as data will be periodically reset.
{% endhint %}


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