🌍 Landsol - Decentralized Real Estate NFT Platform

🚀 Overview

Landsol is a blockchain-powered decentralized application (DApp) that revolutionizes real estate transactions in India by leveraging ERC-721 NFTs for property ownership and IPFS (via Pinata) for secure document storage. The platform ensures transparent, fraud-proof, and tamper-resistant land dealings using smart contracts on the Ethereum blockchain.

🏗 How It Works

1. Admin Creates a Property Token:

   • Each property is minted as an ERC-721 NFT.
   • The NFT contains ownership details and legal documents stored on IPFS.

2. Token Transfer to Buyer:

   • The admin transfers the property NFT to the buyer.
   • The token can be resold to another buyer directly without middlemen.

3. Escrow-Free Transactions:

   • Smart contracts ensure transactions occur securely without third-party involvement.
   • Ownership is verified on-chain, reducing fraud risk.

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🔥 Features

✅ NFT-Based Land Ownership: Each property is tokenized as a unique ERC-721 NFT ensuring immutable ownership records.

✅ IPFS-Based Document Storage: Property documents, agreements, and metadata are securely stored on IPFS via Pinata.

✅ Smart Contract Transactions: Automated, secure transactions using escrow-free smart contracts.

✅ KYC Verification: Only verified users can list, buy, or transfer property.

✅ Fractional Ownership (Future Scope): Enables multiple users to co-own properties via NFT fractions.

✅ Low Transaction Fees: Future Polygon integration to minimize gas fees.

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🛠 Tech Stack

Technology	Usage
Solidity	Smart Contracts
Ethereum	Blockchain Network
ERC-721	NFT Standard for Tokenized Properties
IPFS (Pinata API)	Decentralized File Storage
React.js, Next.js	Frontend Development
Node.js, Express.js	Backend Services
MongoDB	Database for User & Property Metadata
Web3.js & MetaMask	Blockchain Authentication

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🔄 Smart Contract Implementation

ERC-721 NFT Contract

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract LandsolNFT is ERC721URIStorage, Ownable {
    uint256 private _tokenIdCounter;

    constructor() ERC721("LandsolProperty", "LAND") {}

    function mintPropertyNFT(address to, string memory tokenURI) public onlyOwner returns (uint256) {
        uint256 tokenId = _tokenIdCounter++;
        _mint(to, tokenId);
        _setTokenURI(tokenId, tokenURI);
        return tokenId;
    }
}

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📂 IPFS Storage with Pinata

To securely store property documents and metadata:

1️⃣ Upload JSON Metadata to Pinata

curl -X POST https://api.pinata.cloud/pinning/pinJSONToIPFS \
    -H "Authorization: Bearer YOUR_PINATA_JWT" \
    -H "Content-Type: application/json" \
    --data '{ "name": "Property1", "description": "Land in Mumbai", "image": "https://ipfs.io/ipfs/{CID}" }'

2️⃣ Store IPFS CID in NFT Metadata

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🏗 Deployment Steps

🔹 1. Clone the Repository

git clone https://github.com/your-repo/Landsol.git
cd Landsol

🔹 2. Install Dependencies

npm install

🔹 3. Run Tests

npx hardhat test

🔹 4. Start Hardhat Local Blockchain

npx hardhat node

🔹 5. Deploy Smart Contract

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

🔹 6. Start the Frontend

npm run start

➡ Open http://localhost:3000 in your browser to interact with the DApp.

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🔗 MetaMask Installation

Step 1: Install MetaMask Extension

🔗 Download MetaMask

Step 2: Connect to Landsol

1️⃣ Open MetaMask.
2️⃣ Select Ethereum Mainnet or Localhost:8545 (for testing).
3️⃣ Import your test account using Hardhat’s generated private key.

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📅 Roadmap

✔ Polygon Integration – Reduce gas fees.
✔ Aadhaar-Based KYC – Enhance identity verification.
✔ Fiat Payment Support – Enable INR transactions.
✔ AI-based Property Valuation – Predict prices based on location & market trends.

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Screenshots :

📜 License

This project is licensed under the MIT License.

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