Test on Sepolia before deploying to mainnet
Every project has a Network toggle (Testnet / Mainnet) inside the chain picker. Testnet = free practice deploy with real block-explorer + marketplace presence but zero monetary value. Mainnet = the real release. Recommended path is always testnet first.
Where the toggle lives
Open /editor/setup → step 3 'Destination blockchain'. Below the Ethereum / Solana cards you'll find a Network sub-toggle with two options: 'Sepolia testnet' (or 'Devnet' on Solana) and 'Ethereum mainnet' (or 'Mainnet-beta' on Solana). The same toggle is mirrored on /deploy so you can flip it last minute. New projects default to Testnet for safety.
What testnet actually means
Sepolia (Ethereum testnet) and devnet (Solana) are full clones of the real networks. Block explorers (sepolia.etherscan.io, explorer.solana.com?cluster=devnet), wallets (MetaMask, Phantom, Rainbow) and marketplaces (testnets.opensea.io, devnet variants of Magic Eden) all work — the only difference is that the ETH / SOL has no value. You can rehearse the entire deploy + Collect flow end-to-end without spending real money.
Get free testnet funds
Ethereum / Sepolia: sepoliafaucet.com (Alchemy, 0.5 ETH / 24h with a free account) or cloud.google.com/application/web3/faucet/ethereum/sepolia (Google, no sign-up, lower amounts but reliable). Solana / devnet: solfaucet.com or `solana airdrop 2` if you have the CLI installed. Faucet ETH lands in seconds; ignore the 'value' column on Etherscan since it'll show $0.
What happens at deploy time
When you click Deploy, artsunami reads your project's Network setting and checks your connected wallet's chain id. If they don't match, the green Deploy button is replaced by an orange 'Switch wallet to {Mainnet|Sepolia}' button — clicking it asks your wallet to swap. The deploy button unlocks automatically once the wallet aligns. You can't accidentally deploy to mainnet when the project is set to testnet.
The recommended path
1) Set Network to Testnet, deploy on Sepolia (or devnet). 2) Open your Collect page at /c/<slug>?preview=1 and try a self-Collect with a second test wallet. 3) Check the metadata + image render at testnets.opensea.io/assets/sepolia/<contract>/1 to confirm IPFS / Arweave resolved. 4) Flip Network to Mainnet, hit Deploy again — same .zilla project, same trait files, but on the real network. Total cost of the dry run is just the Sepolia gas (free).
Other chains (roadmap)
Tezos and Bitcoin (Ordinals) show up in the chain picker as 'Coming soon' cards — pick them to see what's planned but you can't deploy on those networks yet. Solana's picker is live but the deploy pipeline itself is still being finalized; for a guaranteed working deploy today, stick to the Ethereum + Sepolia path.
ChatZilla lives at the top of the Help center. It knows every topic in this center and can walk you through your specific collection, wallet or transaction.