Setup a virtual environment, currently only working with python 3.9

virtualenv venv -p python3.9

or

python3 -m venv env if your python version is still 3.9 (use python --version to determine your version.

Activate your virtual environment

source venv/bin/activate

Install OpenZepplin nile

pip install cairo-nile

Install StarkNet dev tools using nile

nile install

Setup yourself an account using nile

Either use a .env file (preferred) or export an environnement variable

nile setup bogusprivatekey

How to setup contracts, order matters for the artifacts and deployments, first build all, then deploy StarkNet, initialize and then deploy solidity contracts.

make build

nile deploy --network goerli counter

The contracts directory contains a simple Cairo contract with the following function:

Getters:

• getCounter(): returns the current counter value and wether or not it's on StarkNet.
• get_l1_gateway(): returns L1 ethereum address

Setters:

• count(): increment the counter by the given amount.
• SNtoEVM(): Send count value to L1 contract via StarkNet messaging.

Layer 1 Handler:

• EVMtoSN(): L1 handler to receive counter value and enable counter on StarkNet.

The contract is deployed at `` on StarkNet alpha 4.

make build

Deploy contract with latest StarkNet deployment

make deploy

Verify contract on Goerli with metadata from StarkNet and Forge

forge verify-contract --chain-id 5 --num-of-optimizations jq < out/counter.sol/Counter.metadata.json .settings.optimizer.runs --constructor-args \ $(cast abi-encode "constructor(uint256)"grep artifacts/abis/counter.json goerli.deployments.txt | tail -n 1 | sed -e 's/0x([0-9a-zA-Z]+)./\1/') \ --compiler-version vjq -r < out/counter.sol/Counter.metadata.json .compiler.version$(jq -r <ls out/deployment-Counter | sort -n | tail -n 1 .deployedTo) contracts/solidity/counter.sol:Counter <etherscan-api-key>

• etherscan-api-key: Sign in and go to Etherscan API key

Once you've created a project and installed dependencies with yarn install, start a development server:

yarn run dev


 or start the server and open the app in a new browser tab
yarn run dev -- --open

To create a production version of your app:

yarn run build

You can preview the production build with yarn run preview.

To deploy your app, you may need to install an adapter for your target environment.