Data NFT & DAO Platform

Data NFTization & DAO Platform

Developed an innovative platform that transforms data assets into NFTs and implements a DAO-based governance system for NFT sales participation.

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System Architecture

Data Asset Tokenization

Designed a comprehensive system to convert data into tradable NFT assets with verifiable ownership and usage rights.

Supported Data Types:

• Research datasets
• Analytics reports
• Market intelligence
• User behavior data
• Proprietary algorithms

ERC-1155 Multi-Token System

Implemented ERC-1155 standard for efficient multi-token management.

// Data NFT Multi-Token Contract
contract DataNFT is ERC1155, Ownable {
    struct DataAsset {
        string dataHash;           // IPFS hash of encrypted data
        string metadataURI;        // Metadata location
        uint256 totalSupply;       // Maximum editions
        uint256 price;             // Base price per token
        address creator;           // Data provider
        uint256 royaltyPercent;    // Royalty for creator
        bool transferable;         // Can be resold
    }
    
    mapping(uint256 => DataAsset) public dataAssets;
    uint256 public nextTokenId;
    
    function mintDataNFT(
        string memory dataHash,
        string memory metadataURI,
        uint256 supply,
        uint256 price,
        uint256 royaltyPercent
    ) external returns (uint256) {
        uint256 tokenId = nextTokenId++;
        
        dataAssets[tokenId] = DataAsset({
            dataHash: dataHash,
            metadataURI: metadataURI,
            totalSupply: supply,
            price: price,
            creator: msg.sender,
            royaltyPercent: royaltyPercent,
            transferable: true
        });
        
        _mint(msg.sender, tokenId, supply, "");
        
        emit DataAssetMinted(tokenId, msg.sender, dataHash);
        return tokenId;
    }
}

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DAO Governance System

NFT Sales Participation

Implemented a unique DAO mechanism where token holders vote on which data NFTs to list for sale.

// DAO Governance Contract
contract DataNFTDAO {
    struct Proposal {
        uint256 tokenId;           // NFT to be listed
        uint256 proposedPrice;     // Suggested sale price
        uint256 votesFor;
        uint256 votesAgainst;
        uint256 deadline;
        bool executed;
        mapping(address => bool) hasVoted;
    }
    
    mapping(uint256 => Proposal) pub proposals;
    uint256 public proposalCount;
    
    uint256 public constant QUORUM = 30; // 30% participation required
    uint256 public constant APPROVAL_THRESHOLD = 60; // 60% approval needed
    
    function createProposal(
        uint256 tokenId,
        uint256 proposedPrice
    ) external returns (uint256) {
        require(governanceToken.balanceOf(msg.sender) > 0, "No voting power");
        
        uint256 proposalId = proposalCount++;
        Proposal storage proposal = proposals[proposalId];
        proposal.tokenId = tokenId;
        proposal.proposedPrice = proposedPrice;
        proposal.deadline = block.timestamp + 7 days;
        
        emit ProposalCreated(proposalId, tokenId, proposedPrice);
        return proposalId;
    }
    
    function vote(uint256 proposalId, bool support) external {
        Proposal storage proposal = proposals[proposalId];
        require(block.timestamp < proposal.deadline, "Voting ended");
        require(!proposal.hasVoted[msg.sender], "Already voted");
        
        uint256 votingPower = governanceToken.balanceOf(msg.sender);
        
        if (support) {
            proposal.votesFor += votingPower;
        } else {
            proposal.votesAgainst += votingPower;
        }
        
        proposal.hasVoted[msg.sender] = true;
    }
    
    function executeProposal(uint256 proposalId) external {
        Proposal storage proposal = proposals[proposalId];
        require(block.timestamp >= proposal.deadline, "Voting ongoing");
        require(!proposal.executed, "Already executed");
        
        uint256 totalVotes = proposal.votesFor + proposal.votesAgainst;
        uint256 totalSupply = governanceToken.totalSupply();
        
        require(
            totalVotes * 100 / totalSupply >= QUORUM,
            "Quorum not reached"
        );
        
        require(
            proposal.votesFor * 100 / totalVotes >= APPROVAL_THRESHOLD,
            "Proposal rejected"
        );
        
        proposal.executed = true;
        marketplace.listNFT(proposal.tokenId, proposal.proposedPrice);
    }
}

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NFT Royalty System

Perpetual Creator Rewards

Designed sophisticated royalty distribution ensuring creators benefit from secondary sales.

contract RoyaltyManager {
    struct RoyaltyInfo {
        address recipient;
        uint256 percentage; // Basis points (100 = 1%)
    }
    
    mapping(uint256 => RoyaltyInfo[]) public royalties;
    
    function setRoyalties(
        uint256 tokenId,
        address[] memory recipients,
        uint256[] memory percentages
    ) external onlyCreator(tokenId) {
        require(recipients.length == percentages.length, "Length mismatch");
        
        uint256 totalPercent = 0;
        for (uint256 i = 0; i < percentages.length; i++) {
            totalPercent += percentages[i];
            royalties[tokenId].push(RoyaltyInfo({
                recipient: recipients[i],
                percentage: percentages[i]
            }));
        }
        
        require(totalPercent <= 2000, "Max 20% royalty");
    }
    
    function distributeRoyalties(uint256 tokenId, uint256 salePrice) 
        internal 
    {
        RoyaltyInfo[] storage royaltyInfo = royalties[tokenId];
        
        for (uint256 i = 0; i < royaltyInfo.length; i++) {
            uint256 amount = (salePrice * royaltyInfo[i].percentage) / 10000;
            payable(royaltyInfo[i].recipient).transfer(amount);
        }
    }
}

Royalty Features:

• Multi-recipient support (split royalties among collaborators)
• Customizable percentages per NFT
• Automatic distribution on every sale
• Immutable once set to ensure trust

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Blockchain Platform Research

Multi-Chain Evaluation

Conducted comprehensive analysis of blockchain platforms for optimal project requirements:

Evaluated Platforms:

1. Ethereum: High security, established ecosystem, but expensive gas
2. Polygon: Low fees, Ethereum compatibility, good for scaling
3. Klaytn: Asian market focus, fast finality, moderate fees
4. BSC: Low cost, wide adoption, centralization concerns
5. Solana: High throughput, low cost, but different programming model

Selection Criteria:

• Transaction cost vs. throughput
• Smart contract capabilities
• Developer ecosystem
• Target market accessibility
• Security and decentralization

Final Selection: Ethereum + Polygon (L2)

• Ethereum for high-value assets
• Polygon for frequent transactions and lower-value data sets

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Full System Design

Architecture Components

┌─────────────────────────────────────────────┐
│         Frontend (React + Web3.js)          │
│  - Data Upload UI                           │
│  - DAO Voting Interface                     │
│  - NFT Marketplace                          │
└────────────────┬────────────────────────────┘
                 │
┌────────────────▼────────────────────────────┐
│         Backend API (Node.js)               │
│  - Data Encryption Service                  │
│  - IPFS Integration                         │
│  - Blockchain Event Listener                │
└────────────────┬────────────────────────────┘
                 │
┌────────────────▼────────────────────────────┐
│      Smart Contracts (Solidity)             │
│  ├─ DataNFT (ERC-1155)                      │
│  ├─ DataNFTDAO (Governance)                 │
│  ├─ Marketplace (Trading)                   │
│  └─ RoyaltyManager (Distribution)           │
└──────────────────────────────────────────────┘

Data Flow

1. Upload: User uploads data → Backend encrypts → Stores on IPFS
2. Mint: User mints NFT with IPFS hash → Smart contract records ownership
3. Propose: Token holder proposes listing → DAO contract creates proposal
4. Vote: Community votes on proposal → Votes recorded on-chain
5. Execute: If approved, NFT listed on marketplace
6. Purchase: Buyer purchases → Royalties auto-distributed → Data access key transferred

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Technical Achievements