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Declaring new contracts

info

This command can be used to declare Cairo 0 contracts only. To declare a Cairo 1 contract, see declare command.

danger

This command has been renamed from declare and is deprecated. It won't be supported in the future releases. Please consider migrating your contracts to Cairo 1.

Overview​

Starknet provides a distinction between contract class and instance. To deploy a new contract, you need to:

  1. Declare a contract
  2. Use the deploy syscall with the class_hash from the declare transaction as an argument
    from starkware.starknet.common.syscalls import deploy

The basic inputs needed for this command are:

  • Path to the compiled contract file
  • Network you want to target (i.e. its name or gateway URL)

For detailed API description, see declare-cairo0 command reference.

Usage example​

To declare a Cairo 0 contract from the Protostar CLI, you need to build your project and use the protostar declare-cairo0 command.

protostar declare-cairo0 ./build/main.json --network testnet
Declare transaction was sent.
Class hash: 0x038cc...
Transaction hash: 0x3c6c...

https://goerli.voyager.online/contract/0x038cc...
note

If you need to print machine-readable output in JSON format, you should use --json flag.

This may come in handy for writing scripts that include protostar commands.

For more information, go to this page