ETH + AVAX Proof Smart Contract Management Project

Introduction

This project demonstrates a Solidity smart contract named Assessment designed for managing Ether deposits, withdrawals, and transfers. It integrates error-handling techniques and connects to a React-based frontend for decentralized application (DApp) interactions.

Contract Overview

The Assessment contract enforces an onlyOwner modifier to restrict key operations (deposit, withdraw, transfer) to the contract owner. Key features:

Deposit/Withdraw/Transfer Functions
Balance Tracking
Event Logging

Core Functions

Function	Description
`deposit(uint256)`	Owner deposits Ether into the contract. Emits `Deposit` event.
`withdraw(uint256)`	Owner withdraws Ether. Checks balance sufficiency. Emits `Withdraw` event.
`transfer(address,uint256)`	Transfers Ether to a specified address. Emits `Transfer` event.
`getBalance()`	Returns the contract's current Ether balance (read-only).

Events

Deposit(uint256 amount)
Withdraw(uint256 amount)
Transfer(address indexed to, uint256 amount)

👉 Learn more about smart contract security best practices

Frontend Integration (React DApp)

The React interface enables users to:

Connect MetaMask wallets.
Deposit/withdraw Ether.
Transfer funds via a user-friendly UI.

Key Components

Wallet Connection: getWallet and connectAccount functions handle MetaMask integration.
Contract Interaction: Functions like deposit, withdraw, and transferFunds use ethers.js to call smart contract methods.
Dynamic UI: Displays real-time balance updates and transaction forms.

Project Requirements

GitHub Submission: Public repository with README.md detailing project purpose.
Video Demonstration: 5-minute review of three contracts (optional for this project).
Code Quality: MIT-licensed, modular Solidity code with error handling.

Usage Instructions

Local Development Setup

Clone the repository and run:

npm i
npx hardhat node
npx hardhat run --network localhost scripts/deploy.js
npm run dev

Access the DApp at http://localhost:3000.

MetaMask Configuration

RPC URL: https://8545-metacrafterc-scmstarter-msotxik1s10.ws-us104.gitpod.io
Chain ID: 31337
Currency Symbol: ETH

👉 Troubleshoot MetaMask connection issues

FAQ

How do I deposit Ether into the contract?

Call the deposit function via the DApp or directly through Etherscan, specifying the amount in Wei.

What happens if a non-owner tries to withdraw?

The onlyOwner modifier reverts the transaction with an error.

Can I test this without real ETH?

Yes! Deploy to a local Hardhat network or testnets like Goerli.

License

MIT License.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;