Decentralized Crowdfunding Smart Contract

A fully on-chain crowdfunding system written in Solidity.
Contributors can donate ETH, vote on fund usage, and approve project expenses through a decentralized governance mechanism.

Features

1. Contribution System

• Anyone can donate Ether.
• Enforces a minimum contribution.
• Tracks each contributor’s total amount.
• Deadline-based funding window.

2. Target & Refund Logic

• Funding target is set at deployment.
• If target is not reached before the deadline:
  • Contributors can claim a refund.
• If target is reached:
  • Funds are locked for spending requests only.

3. Spending Requests (DAO-style)

• Manager creates spending requests with:
  • Description
  • Recipient address
  • Requested amount
• Each request tracks:
  • List of voters
  • Vote count
  • Completion status

4. Voting Mechanism

• Only contributors can vote.
• Each contributor gets one vote per request.
• Payment is processed only if more than 50% of contributors approve.

5. Manager Permissions

• Only the manager (contract deployer) can:
  • Create spending requests
  • Execute approved payments

Contract Flow

1. Deploy contract → set target, deadline, minimum contribution
2. Users donate Ether → contributions tracked
3. If target not met → users can refund
4. If target met → manager creates spending requests
5. Contributors vote on requests
6. Once majority approves → manager releases funds to recipient

Tech Stack

• Solidity ^0.8.x
• Ethereum Virtual Machine
• OpenZeppelin (Strings library optional)
• Remix / Hardhat for deployment

How to Use

1. Deploy contract
2. Call donateth() to contribute
3. After deadline:
   • If goal not reached → call Refund()
   • If goal reached → manager creates requests
4. Contributors vote using voterequest(requestId)
5. Manager finalizes payment using makepayment(requestId)

Security Notes

• Uses mapping inside struct for voter tracking.
• Prevents double voting.
• Only manager can execute sensitive actions.
• Ensures democratic approval before fund release.