Blockchain-Based Procurement System

This project implements a decentralized procurement system on the Ethereum blockchain using Solidity. It enables secure and transparent bidding. The project includes a smart contract deployed using Foundry.

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Features

• Owner Controls:

  • Set bidding duration.
  • Whitelist or remove bidders.
  • End the bidding process.

• Bidder Features:

  • Submit encrypted bids while maintaining privacy.
  • Check if whitelisted for participation.

• Post-Bidding:

  • Retrieve and display all submitted bids (accessible only by the owner).
  • List whitelisted bidders.

• Duration Tracking:

  • Display time remaining for bidding to end.

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Smart Contract Overview

The smart contract, ProcurementContract.sol, defines the core functionalities of the procurement system:

Core Elements

• Structs:

  • Bid stores the encrypted bid and corresponding bidder address.

• State Variables:

  • owner: The address of the contract owner.
  • biddingEndTime: Timestamp when bidding ends.
  • ended: Status of the bidding process.
  • whitelist: List of whitelisted addresses.
  • bids: Mapping of bidder addresses to their bids.
  • bidders: Array of bidder addresses.

Key Functions

• setBidDuration(uint duration)
  Sets the bidding duration.

• whitelistBidder(address _bidder)
  Adds a bidder to the whitelist.

• removeWhitelistBidder(address _bidder)
  Removes a bidder from the whitelist.

• submitBid(bytes memory _Bid)
  Allows whitelisted bidders to submit encrypted bids.

• endBidding()
  Ends the bidding process.

• getBids()
  Fetches all submitted bids and corresponding addresses (owner-only).

• getWhitelist()
  Retrieves the list of whitelisted addresses.

• getDurationLeft()
  Returns the time left for bidding to end.

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Installation and Setup

Prerequisites

• Node.js installed on your system.
• Foundry installed for contract deployment.

Steps

git clone https://github.com/Anirruth/Procurement-using-Blockchain.git
cd Procurement-using-Blockchain
cd project-frontend
npm install
npm start