Networks
Preview vs Preprod
Two Cardano testnets. Preview moves faster and matches the latest node; Preprod mirrors mainnet parameters. Pick one and stick with it for the whole build — your wallet, Blockfrost/Koios project, and dApp must all be on the same network.
Fast-moving testnet aligned with the latest node release. Best for hackathon builds.
- Network magic
- 2
- Address prefix
- addr_test1...
- CIP-30 networkId
- 0 (testnet)
Shorter epochs (1 day). Frequent resets. Match your Blockfrost/Koios project to the preview network.
Pre-production mirror of mainnet parameters and epoch length. Best for integration testing before mainnet.
- Network magic
- 1
- Address prefix
- addr_test1...
- CIP-30 networkId
- 0 (testnet)
5-day epochs like mainnet. Stable, longer-lived contracts. Match your provider to preprod.
Default to Preview — faster epochs mean less waiting for confirmations and the faucet is more generous. Move to Preprod only if you need mainnet-shaped epoch timing or if you plan to promote the dApp to mainnet later.