The NFT Marketplace is a decentralized platform for buying, selling, and auctioning NFTs (Non-Fungible Tokens). This contract allows users to list their NFTs for sale or auction, and buyers can purchase or bid on these NFTs. The marketplace also supports royalty payments to the creators of the NFTs.
- NFT Sale: List NFTs for sale at a fixed price.
- NFT Auction: List NFTs for auction with a starting price and deadline.
- Royalty Payments: Automatically distribute royalties to the creators of the NFTs on each sale.
- Cancel Sale/Auction: Sellers can cancel their listings if they are not sold or auctioned.
- Secure Payments: Ensure secure payment transfers between buyers and sellers, including a marketplace fee.
- Bid System: Allow users to place bids on NFTs listed for auction.
- Finish Auction: Automatically finalize the auction process and transfer the NFT to the highest bidder.
- Ownership Verification: Verify the ownership of NFTs before listing them for sale or auction.
- Upgradeable Contract: Support for contract upgrades using a proxy model.
Before starting the project, I set up the development environment and installed the necessary dependencies. These dependencies included Hardhat, OpenZeppelin Contracts, Slither, and Echidna. This step laid a solid foundation for the project and helped me carry out subsequent steps more efficiently.
I developed the smart contracts for the NFT Marketplace. In this phase, I carefully defined the structures for items listed for sale and auction. I successfully implemented functions for initiating, canceling, and purchasing NFTs through sales and auctions. This established the core functionality of the marketplace, providing a platform that meets users' needs.
To ensure that the smart contracts functioned as expected, I wrote and executed comprehensive tests. I performed in-depth static analysis with Slither to identify potential security vulnerabilities and conducted fuzz testing with Echidna to ensure robustness. This step enhanced the project's reliability and resilience, providing a secure environment for users.
Finally, I meticulously reviewed the smart contract code and optimized it for gas efficiency and security. I addressed issues identified during testing and static analysis with great care. This step maximized the project's performance and security, enhancing the user experience.
Create a .env file and set the necessary environment variables:
INFURA_PROJECT_ID=your-infura-project-id
DEPLOYER_PRIVATE_KEY=your-private-keynpx hardhat run scripts/deploy.js --network sepolia