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Flow Previewnet

About Flow Previewnet​

Flow 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:


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access.previewnet.nodes.onflow.org:9000

You can also access the network using the Flow Go SDK:


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import "github.com/onflow/flow-go-sdk/client"
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func main() {
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flowAccessAddress := "access.previewnet.nodes.onflow.org:9000"
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flowClient, _ := client.New(flowAccessAddress, grpc.WithInsecure())
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// ...
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}

Generating Keypair​

You can generate a new keypair with the Flow CLI as follows:


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> flow keys generate
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🙏 If you want to create an account on Previewnet with the generated keys use this link:
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https://previewnet-faucet.onflow.org/?key= cc1c3d72...
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🔴️ Store private key safely and don't share with anyone!
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Private Key 246256f3...
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Public 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 the Previewnet to identify which ones you want to import into your project.