> 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/developers/connect-to-cycle/connect-to-cycle-testnet/cycle-cuttlefish-archived.md).

# Cycle CuttleFish (Archived)

## **Introdction:**

CuttleFish testnet is a cycle test network running in parallel with the JellyFish testnet. This network has incorporated additional compatibility upgrades to integrate with various EVM-compatible blockchain networks, although there are some differences in details compared to traditional EVM virtual machines.

## **Network:**

Cycle

| **ChainId** | **chainName**    | **Currency** | **NetworkId** |
| ----------- | ---------------- | ------------ | ------------- |
| 1228        | Cycle CuttleFish | ETH          | 1             |

Security Layer

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

Extend Layer

| **ChainId** | **chainName**   | **NetworkId** |
| ----------- | --------------- | ------------- |
| 1802203764  | Kakarot Sepolia | 16            |

{% hint style="info" %}
Please check the Official Documentations of the extend layers listed above to learn the difference between their VM and standard EVM.
{% endhint %}

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