Digital Property Smart Contract - RWA

Overview

The Digital Property Smart Contract is a blockchain-based solution designed for registering and managing ownership of digital or real-world assets. Built with Solidity, this contract ensures transparency, security, and immutability in asset ownership and transfers.

This project was developed and tested using Remix IDE, making it easy to deploy and interact with the smart contract directly in a web browser.

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Features

• Asset Registration: Allows users to register properties with a unique ID and description.
• Ownership Transfer: Owners can transfer properties to other users securely.
• Ownership Verification: Anyone can verify the current owner of a property.
• Event Logging: All important actions, such as registration and transfer, trigger blockchain events for transparency.

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Smart Contract Details

Functions

1. registerProperty(uint256 id, string memory description)

   • Registers a property with a unique identifier and description.
   • Emits the PropertyRegistered event.

2. transferOwnership(uint256 id, address newOwner)

   • Transfers ownership of a registered property to another user.
   • Emits the OwnershipTransferred event.

3. getProperty(uint256 id)

   • Retrieves details of a registered property, including its ID, description, and current owner.

Events

• PropertyRegistered(uint256 id, string description, address owner)
• OwnershipTransferred(uint256 id, address previousOwner, address newOwner)

Additional Functions for Flexibility

• fallback(): Handles unexpected or undefined function calls.
• receive(): Allows the contract to receive ether directly.

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How to Use

Prerequisites

• Remix IDE: Accessible via https://remix.ethereum.org.

Steps to Deploy and Test in Remix IDE

1. Open Remix IDE

   • Go to Remix IDE.

2. Create the Smart Contract File

   • In the File Explorer, create a new file (e.g., PropertyRegistry.sol).
   • Copy and paste the smart contract code into the file.

3. Compile the Contract

   • Navigate to the Solidity Compiler tab.
   • Select a compiler version compatible with the code (e.g., 0.8.x), in my case i used 0.8.24 .
   • Click Compile PropertyRegistry.sol.

4. Deploy the Contract

   • Go to the Deploy & Run Transactions tab.
   • Select the environment:
     • Remix VM (Cancun) for local testing.
   • Click Deploy to deploy the contract.

5. Interact with the Contract

   • Use the deployed contract interface to call functions like registerProperty and transferOwnership.

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Testing the Contract

Functional Tests

1. Basic Registration

   • Call registerProperty with:
     • id = 1
     • description = "House in Marbella"
   • Use getProperty(1) to confirm that the property is correctly stored.

2. Ownership Transfer

   • Call transferOwnership on a registered property to transfer ownership to another address.
   • Verify that the ownership has changed using getProperty.

3. Duplicate IDs

   • Try registering another property with the same ID. The contract should reject the transaction.

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Security Tests

1. Unauthorized Access

   • Attempt to transfer ownership of a property from a non-owner account. The transaction should fail.

2. Invalid Addresses

   • Test transferring a property to the 0x0 address. The contract should reject the transaction.

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Edge Case Tests

1. High and Low IDs

   • Register properties with extremely high or low ID values (e.g., 0, 2**256 - 1).

2. Long Descriptions

   • Register a property with a very long description to check if the contract handles large strings.

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Example Code Snippets

Registering a Property

registerProperty(1, "Apartment in Barcelona");

Transferring Ownership

transferOwnership(1, 0x123456789abcdef123456789abcdef123456789a);

Checking Property Details

getProperty(1);

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Future Enhancements

• Metadata Integration: Add ERC-721 standards to include metadata for properties.
• KYC System: Introduce user verification before registering or transferring properties.
• Multi-Signature Transfers: Enable multi-signature approvals for high-value properties.

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License

This project is licensed under the LGPL-3.0-only.

Visual Representation

A clear and interactive UI could be built using frameworks like React.js to interact with this contract for enhanced user experience. For now, enjoy the simplicity and power of Remix IDE! 🚀