Flow Previewnet
About Flow Previewnet
Previewnet is Flow's official testing and development network for the Crescendo upgrade. It is intended to provide an early experimentation environment for app developers. It aims to balance similarity with Mainnet with being a productive development environment, resulting in the following key differences:
- Significantly fewer validator nodes, resulting in a faster block rate compared to Mainnet
- Shorter epochs (about 12 hours, compared to 7 days on Mainnet)
Accessing Flow Previewnet
Previewnet is available for access at this URL:
_10access.previewnet.nodes.onflow.org:9000
To access the network using the Flow Go SDK:
_10import "github.com/onflow/flow-go-sdk/client"_10_10func main() {_10 flowAccessAddress := "access.previewnet.nodes.onflow.org:9000"_10 flowClient, _ := client.New(flowAccessAddress, grpc.WithInsecure())_10 // ..._10}
Generating Keypair
You can generate a new keypair with the Flow CLI as follows:
_10> flow keys generate_10_10🙏 If you want to create an account on Previewnet with the generated keys use this link:_10https://previewnet-faucet.onflow.org/?key= cc1c3d72..._10_10_10🔴️ Store private key safely and don't share with anyone!_10Private Key 246256f3..._10Public Key cc1c3d72...
Note: By default, this command generates an ECDSA key pair on the P-256 curve. Keep in mind, the CLI is intended for development purposes only and is not recommended for production use. Handling keys using a Key Management Service is the best practice.
Account Creation and Token Funding Requests
Accounts and tokens for testing can be obtained through the previewnet faucet. If you generated the keypair through the CLI, you can click on the URL provided to create an account and request FLOW tokens.
Important Smart Contract Addresses
You can review all available core contracts deployed to identify which ones you want to import in your project.