This sample dapp emits an event with the last account that clicked on the "capture the flag" button. We will integrate this dapp to work gaslessly with GSN v3. This will allow an externally owned account without ETH to capture the flag by signing a meta transaction.

1. first clone and yarn install
2. run yarn gsn-with-ganache to start a node, and also deploy GSN contracts and start a relayer service.
3. Make sure you have Metamask installed, and pointing to "localhost"
4. In a different window, run yarn start, to deploy the contract, and start the UI
5. Start a browser pointing to "http://localhost:3000"
6. Click the "Capture the Flag" button. Notice that you don't need eth in your account: You only sign the transaction.

You can see the integrations as GitHub pull requests:

1. (this branch) Basic: Minimum viable GSN integration
2. Advanced: Write your own custom Paymaster

Note: on testnet we maintain a public service "pay for everything" paymaster so writing your own is not strictly required. On mainnet, you need a custom paymaster, such as a token paymaster that allow users to pay for gas in tokens, and exchanging them for ETH ETH on Uniswap. Dapps will want to develop their own custom paymaster in order, for example to subsidize gas fees for new users during the onboarding process.

GSNv3 integration tutorial: https://docs.opengsn.org/tutorials

Documentation explaining how everything works: https://docs.opengsn.org/

terminal 1 : yarn gsn-with-ganache terminal 2 : yarn start

checker le cosole log du localhost