# AltLayer Nitrogen Testnet Launched! 🚀

By [Alexxi](https://paragraph.com/@alexxi) · 2024-01-11

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AltLayer Nitrogen Testnet Launched! 🚀 @alt\_layer today launched Nitrogen: a public @Arbitrum Orbit testnet using @CelestiaOrg as modular DA.

Make sure to try it out.

1.  Add chain: [https://rollup-info.altlayer.io/public/nitrogen](https://rollup-info.altlayer.io/public/nitrogen)
    
2.  Claim Nitrogen Testnet ETH: [https://l2faucet.com](https://l2faucet.com)
    
3.  Deploy a contract: [https://thirdweb.com/dashboard/contracts/deploy](https://thirdweb.com/dashboard/contracts/deploy)
    

Currently, no other dApps are available to test the chain. Stay tuned for upcoming deployments.

*   You might encounter a "chain ID" error while adding the chain. If so, just wait for the official update; I'm experiencing this issue too.
    

Official doc file: [https://docs.altlayer.io/altlayer-documentation/external-integrations/nitrogen-orbit-celestia-testne](https://docs.altlayer.io/altlayer-documentation/external-integrations/nitrogen-orbit-celestia-testnet)

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*Originally published on [Alexxi](https://paragraph.com/@alexxi/altlayer-nitrogen-testnet-launched)*