We will use the FlowtyTestNFT contract as an example, you should replace it with your project smart contract

Requirements:

• Flow CLI installed into your computer https://developers.flow.com/tools/flow-cli/install

• Crescendo Flow CLI installed into your computer https://cadence-lang.org/docs/cadence-migration-guide#install-cadence-10-cli

Create a new testnet account

• Open the terminal and run the command: flow accounts create

• Enter the account name, for example: testnet-account

• Select testnet network

• At the end you will see that a new account has been added to your flow.json file

Deploy FlowtyTestNFT pre-crescendo contract version

• Open the flow.json file and inside the deployments object add:

    "testnet": {
      "your-testnet-account-name-here": [ "FlowtyTestNFT" ]
    },

• Run the command to deploy the contract on the testnet network using your new testnet account flow project deploy -n=testnet

Stage the updated version of the contract on the testnet

• Inside the flow.json file, update the testnet contract address present inside the contracts > FlowtyTestNFT > aliases > testing object, using the new testnet account address where you deployed you FlowtyTestNFT contract version

  • Current alises.testing value: 0000000000000007
  • To the new testnet wallet address that you created on previous step

• Inside the flow.json file, update the FlowtyTestNFT source, to use the crescendo update FlowtyTestNFT version, to it you will need to replace the:

  • Current source: "./contracts/FlowtyTestNFT.cdc"
  • To the one using cadence 1.0 contract version: "./contracts-v1/FlowtyTestNFT.cdc"

• With the updated paths in the flow.json file you can now run the command that will perform the migration to the updated contract:

flow-c1 migrate stage FlowtyTestNFT --network=testnet