01_hello.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

contract Hello
{
    string hello = "Hola mundo!";

    function setHello(string memory _hello) public
    {
        hello = _hello;
    }

    function getHello() public view returns (string memory)
    {
        return hello;
    }
}

02_SimpleToken.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract SimpleToken is ERC20 {
    constructor(
        string memory name,
        string memory symbol,
        uint256 initialSupply
    ) ERC20(name, symbol) {
        _mint(msg.sender, initialSupply * 1 ether);
    }
}

03_hardhat demo.md

Archivo de configuración

  networks: {
    scrollSepolia: {
      url: "https://scroll-testnet-public.unifra.io/" || "",
      accounts:
        process.env.PRIVATE_KEY !== undefined ? [process.env.PRIVATE_KEY] : [],
    },
  },

Comando de Deploy

npx hardhat run scripts/deploy.js --network scrollSepolia

04_eas_demo.sol

//////////////////////////////////////////////////////////////////
//EAS
// SPDX-License-Identifier: MIT

pragma solidity 0.8.24;

import { IEAS, AttestationRequest, AttestationRequestData, RevocationRequest, RevocationRequestData } from "@ethereum-attestation-service/eas-contracts/contracts/IEAS.sol";
import { NO_EXPIRATION_TIME, EMPTY_UID } from "@ethereum-attestation-service/eas-contracts/contracts/Common.sol";

contract EASDemo
{
    address easAddress = 0xaEF4103A04090071165F78D45D83A0C0782c2B2a;
    bytes32 schema = 0x27d06e3659317e9a4f8154d1e849eb53d43d91fb4f219884d1684f86d797804a;

    function sendIsFriend(address to, bool isFriend) public returns(bytes32)
    {
        return IEAS(easAddress).attest(
                AttestationRequest({
                    schema: schema,
                    data: AttestationRequestData({
                        recipient: to,
                        expirationTime: NO_EXPIRATION_TIME,
                        revocable: false,
                        refUID: EMPTY_UID,
                        data: abi.encode(isFriend),
                        value: 0 // No value/ETH
                    })
                })
            );
    }
}

05_chainlink_demo.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import {AggregatorV3Interface} from "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

contract DataConsumerV3 {
    AggregatorV3Interface internal dataFeed;

    constructor() {
        dataFeed = AggregatorV3Interface(
            0x87dce67002e66C17BC0d723Fe20D736b80CAaFda
        );
    }

    function getChainlinkDataFeedLatestAnswer() public view returns (int) {
        // prettier-ignore
        (
            /* uint80 roundID */,
            int answer,
            /*uint startedAt*/,
            /*uint timeStamp*/,
            /*uint80 answeredInRound*/
        ) = dataFeed.latestRoundData();
        return answer;
    }
}