OP Sepolia에 컨트랙트 배포하기

curl -L https://foundry.paradigm.xyz | bash

foundryup

mkdir first-contract
cd first-contract
forge init

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Greeter {
    string greeting;

    event SetGreeting(
        address indexed sender,     // msg.sender
        string greeting
    );

    function greet() public view returns (string memory) {
        return greeting;
    }

    function setGreeting(string memory _greeting) public {
        greeting = _greeting;
        emit SetGreeting(msg.sender, _greeting);
    }
}

forge build

cast wallet new

export L2_RPC_URL=https://sepolia.optimism.io
export PRIVATE_KEY=0x...your-private-key...
export ACCOUNT_ADDRESS=$(cast wallet address --private-key $PRIVATE_KEY)

cast call --rpc-url $L2_RPC_URL $CONTRACT_ADDRESS "greet()" | cast --to-ascii

cast send \
  --private-key $PRIVATE_KEY \
  --rpc-url $L2_RPC_URL \
  $CONTRACT_ADDRESS \
  "setGreeting(string)" "Hello from OP Sepolia"

cast call --rpc-url $L2_RPC_URL $CONTRACT_ADDRESS "greet()" | cast --to-ascii