Swapify is a decentralized application that enables trustless, peer-to-peer atomic swaps of NFTs on the Sepolia testnet. Built with security and simplicity in mind, it leverages Hash Time Locked Contracts (HTLC) to ensure that swaps are all-or-nothing, eliminating the need for trusted intermediaries.

Contract Address: https://sepolia.etherscan.io/address/0xb392a011a5f0547f64ac18f0414adb202e434691

Demo Link: https://swapify-sepolia.vercel.app/

Key Features:

• Trustless & Atomic: Swaps are executed directly between users. The entire transaction either completes successfully for both parties or fails, returning the assets to their original owners.
• Secure: Utilizes cryptographic secret hashes and a 24-hour timelock to protect users' assets from getting stuck indefinitely.
• User-Friendly Dashboard: A clean interface to create new swaps, view incoming offers, and manage all your active and completed swaps in one place.
• Real-Time Status: Track the progress of your swaps with clear status indicators (e.g., "Pending Initiator", "Awaiting Response", "Completed").

How It Works: The Swap Flow

The atomic swap process is secured by a secret known only to the initiator (User A). The swap can only be completed when the responder (User B) provides this secret.

• Create Swap: User A initiates a swap by specifying their NFT, the desired NFT from User B, and User B's wallet address. A secret is generated, and its hash is stored in the smart contract.
• Share Secret: User A securely shares the secret with User B off-chain (e.g., via a secure messaging app).
• Initiator Locks NFT: User A approves the Swapify contract to access their NFT and then locks it into the contract. The swap is now active and waiting for User B.
• Responder Completes Swap: User B sees the pending swap, approves their NFT for the contract, and provides the secret from User A to lock their NFT and finalize the swap. The smart contract verifies the secret, and instantly transfers both NFTs to their new owners.
• Safety Timelock: If User B does not complete the swap within 24 hours, either user can cancel the swap, safely returning the locked NFT to its original owner.