NFT Marketplace Developed Using Ethereum (ERC-20,721,6551)

The client wanted to create an innovative NFT marketplace that moved beyond traditional buying and selling of NFTs, focusing instead on functional NFTs with built-in utilities. Their goals included:

1. NFT Wallet Integration

Each NFT purchased on the platform needed to have its own wallet embedded inside it, allowing it to hold both fungible (ERC20) and non-fungible (ERC721/1155) tokens. This concept aligns with the ERC6551 standard for Token Bound Accounts, creating NFTs that act as fully functional accounts themselves.

2. Configuration Drafts

To improve user experience, the platform required a feature to save ongoing NFT configurations as drafts, enabling users to pause and resume their setup without losing progress.

3. Subscription Management

The marketplace needed smart contracts for subscription-based NFTs, with flexible payment options and automatic token distribution over time.

4. Referral Program

To drive growth and user engagement, each NFT owner should be able to generate a unique referral code to invite new users, earn rewards, or share NFTs.

5. QR Code Functionality

Each NFT should have a dynamic QR code that could act as a ticket or pass to an event. This QR code should be viewable as a PDF and/or downloadable to share, and also to use if your event is virtual or in-person.

6. Document NFTs

An added requirement was being able to tokenize personal documents in NFT format in the same way a Soul Bound Token (SBT) does. These document NFTs would need to be stored securely and be accessible only by the owner to ensure privacy and exclusivity. 

Seaflux delivered a custom-built NFT marketplace that not only fulfilled all client requirements but also elevated the user experience with cutting-edge blockchain integrations.

1. Token Bound NFT Wallet

• Developed an ERC721 contract extended with ERC6551 standards, enabling each NFT to function as a wallet with its own unique address.
• These wallet-enabled NFTs could hold ERC20 tokens, ERC721 tokens, or even other NFTs, unlocking new use cases like NFT bundles, event access tokens, or in-game assets.

2. Subscription Smart Contract

• Built a subscription management contract where users pay upfront fees (calculated in MATIC at the time of purchase).
• We put into place a 12-month subscription model that allows users to subscribe for a specific number of tokens and cancel at any time. 
• Once a user cancels, they will continue to get their tokens; this subscription allows for fair and distributed tokens while providing predictability.

3. Referral Code System

• Implemented a referral code generation feature using AccessControl contracts, ensuring only NFT owners could generate referral codes.
• Referral codes could be used by new users for discounted purchases or by existing users to earn rewards.
• This feature boosted community-driven marketing, encouraging owners to promote the platform.

4. Dynamic QR Codes

• Designed a dynamic QR code generation system, where each NFT gets its unique QR code that can be:
  • Used as an event pass or digital ticket.
  • Shared as downloadable PDFs or embedded on websites.
• The QR system was integrated with the blockchain to verify NFT ownership in real time during events.

5. Secure Document NFTs

• Leveraged IPFS for decentralized storage of documents while maintaining immutability.
• Integrated Fully Homomorphic Encryption (FHE), ensuring only NFT owners can access and decrypt their stored documents.
• Transformed NFTs into secure digital vaults for sensitive files like certificates, tickets, and personal IDs.

6. Bulk Upload & Configuration Versioning

• Implemented a bulk upload feature to let users upload multiple NFTs via .txt configuration files.
• Introduced version control for configurations, enabling users to reload previously saved setups even if the original file was lost.

The platform gave users more control, security, and capabilities to offer a new standard in NFT marketplace innovation. It exceeded the collectible space of NFTs to offer real-world utility by using Token Bound Accounts, dynamic QRs, and encrypted document NFTs. Users benefited from enhanced utility, flexibility, and trust, making the marketplace not just a place to buy NFTs, but a platform to manage identity, events, assets, and more through blockchain.

• 9% increase in NFT listings thanks to the draft-saving feature, which allowed users to experiment and iterate on their NFT configurations.
• 30% of platform users now store personal documents as NFTs, leveraging FHE-backed security, which has transformed the platform into a trusted solution for secure document storage.
• Higher user engagement due to QR-code-based event passes and the referral program, which incentivized both new and returning users.
• Improved brand credibility, as the advanced feature set positioned the platform as one of the few next-generation NFT marketplaces integrating TBAs and secure document storage.