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Crowdfunder (Solidity Smart Contract w/ Hardhat)

  • this is my personal implementation of a crowfunder project (similar to kickstarter)

Overview

The purpose of this project is the following:

  • Build a smart contract that allows creators to register their projects.
  • Other people can contribute ETH to that project.
  • Once the goal has been met, the creators can withdraw the funds.
  • When someone contributes 1 ETH, they receive a contributor badge NFT, which is tradable.

Main Commands (to see tests)

  • npm i
  • npx hardhat compile
  • npx hardhat test

Technical Implementation

  • I split the logic into 2 contracts Project.sol and ProjectFactory.sol. I am using factory pattern here.
  • Every time a new project is registered, I create a new contract in Project using ProjectFactory.

More Details

I added comments within contract where each of these features is added

  1. The smart contract is reusable; multiple projects can be registered and accept ETH concurrently.
  • (1a) Specifically, you should use the factory contract pattern.
  1. The goal is a preset amount of ETH.
  • (2a) This cannot be changed after a project gets created.
  1. Regarding contributing:
  • (3a) The contribute amount must be at least 0.01 ETH.
  • (3b) There is no upper limit.
  • (3c) Anyone can contribute to the project, including the creator.
  • (3d) One address can contribute as many times as they like.
  • (3e) No one can withdraw their funds until the project either fails or gets cancelled.
  1. Regarding contributer badges:
  • (4a) An address receives a badge if their total contribution is at least 1 ETH.
  • (4b) One address can receive multiple badges, but should only receive 1 badge per 1 ETH.
  • (4c) Each project should use its own NFT contract.
  1. If the project is not fully funded within 30 days:
  • (5a) The project goal is considered to have failed.
  • (5b) No one can contribute anymore.
  • (5c) Supporters get their money back.
  • (5d) Contributor badges are left alone. They should still be tradable.
  1. Once a project becomes fully funded:
  • (6a) No one else can contribute (however, the last contribution can go over the goal).
  • (6b) The creator can withdraw any amount of contributed funds.
  1. The creator can choose to cancel their project before the 30 days are over, which has the same effect as a project failing.