evire
  • ⚪EVIRE
  • INTRODUCTION
    • ▪️Key Features and Capabilities
    • ▪️High-Level Architecture
    • ▪️Roadmap
    • ▪️Finances
    • ▪️Licensing
    • ▪️Tokenomics
      • EVIRE ERC20 token
      • Token Vesting
    • ▪️Audit
  • Core Concepts
    • ▪️Blockchain Basics
    • ▪️Ethereum Virtual Machine (EVM)
    • ▪️Smart Contracts and Decentralized Applications
  • TESTNET
    • Adding Evire Testnet to Metamask
    • Using the Evire Faucet
  • FRAMEWORKS AND NATIVE FUNCTIONS
    • ▪️Overview
  • AI Framework
    • ▪️Smart Contract Libraries for AI
      • Example: Data Preprocessing Libraries
      • Example: Model Execution and Management Library
    • ▪️Off-Chain Compute Framework
      • Example: AI-Powered Predictive Analytics dApp
      • Example: Off-Chain Computation Request Handling
    • ▪️Decentralized Storage Integration
      • Example: Data Linking via Smart Contracts
      • Example: On-Demand Data Retrieval Implementation
    • ▪️Oracles for Real-Time Data
      • Example: Real-Time Data Fetching Oracle for Financial Models
    • ▪️Model Training and Deployment Tools
      • Example: AI Model Deployment
    • ▪️AI-Specific Governance Protocols
      • Example: AI Governance Smart Contract for Bias Audit and Consensus Decision
    • ▪️User-Friendly Developer Interfaces
    • ▪️Privacy Tools and Standards
  • Gaming Framework
    • ▪️Specialized Gaming Smart Contract Libraries
      • Example: Secure and Fair Random Number Generation Library
      • Example: Asset Trading Library
      • Example: Game State Management Library
      • Example: Evire Player Stats Library
    • ▪️Scalable and Efficient Consensus Mechanisms
    • ▪️Interoperability Features
    • ▪️Robust Developer Tooling
    • ▪️User-Friendly SDKs and APIs
    • ▪️Regulatory Compliance Tools
    • ▪️Flexible Asset Management
  • RWA Framework
    • ▪️Identity Verification and Management Libraries
      • Example: Identity Verification Library
    • ▪️Oracles and Data Feeds
    • ▪️Asset Tokenization Frameworks
      • Example: Real Estate Tokenization Library
    • ▪️Legal Compliance and Smart Contract Auditing Tools
    • ▪️Interoperability Solutions
    • ▪️Privacy Enhancements
    • ▪️DeFi Integration Tools
    • ▪️User-Friendly Interfaces and SDKs
    • ▪️Governance Frameworks
    • ▪️Customizable Smart Contract Templates
  • DePIN Framework
    • ▪️Smart Contract Libraries
      • Example: Physical Infrastructure Management Library
    • ▪️Oracles Integration
    • ▪️IoT Integration Framework
    • ▪️Interoperability Protocols
    • ▪️Developer Tooling
    • ▪️User Interface Components
    • ▪️Security Auditing Tools
    • ▪️Governance and Compliance Frameworks
      • Example: Governance And Compliance Library
    • ▪️Tokenization Support
    • ▪️Documentation and Community Support
  • EXAMPLES
    • ▪️AI Framework
    • ▪️Gaming Framework
    • ▪️RWA Framework
    • ▪️DePIN Framework
  • Legal
    • ▪️Terms and Conditions of Participation
  • More
    • ▪️Faucet
    • ▪️Partners
    • ▪️Contribute
  • Links
    • ▪️Website
    • ▪️Twitter
    • ▪️Telegram
    • ▪️GitHub
    • ▪️Medium
    • ▪️Linktree
    • ◾DeBank
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On this page
  • Step-by-Step Implementation
  • Benefits
  • Considerations
  1. AI Framework
  2. Decentralized Storage Integration

Example: Data Linking via Smart Contracts

Step-by-Step Implementation

  1. Smart Contract Definition

Define the smart contract that will store hashes of the data.

pragma solidity ^0.8.0;

contract DataLinker {
    struct DataReference {
        string dataHash;
        string description;
        uint timestamp;
    }

    mapping(uint => DataReference) public dataReferences;
    uint public dataCount;

    event DataLinked(uint indexed dataId, string dataHash, string description, uint timestamp);

    function linkData(string memory _dataHash, string memory _description) public {
        dataCount++;
        dataReferences[dataCount] = DataReference(_dataHash, _description, block.timestamp);
        emit DataLinked(dataCount, _dataHash, _description, block.timestamp);
    }

    function getData(uint _dataId) public view returns (string memory, string memory, uint) {
        DataReference memory dataRef = dataReferences[_dataId];
        return (dataRef.dataHash, dataRef.description, dataRef.timestamp);
    }
}
  1. Data Storage Off-Chain

Store the actual data on a decentralized storage network such as IPFS (InterPlanetary File System). Upload the data to IPFS and retrieve the hash.

ipfs add path/to/datafile

This command will return a hash, for example: QmXoYP4F2zYF3....

  1. Link Data to Smart Contract

Use the hash obtained from IPFS to link the data to the smart contract.

const Web3 = require('web3');
const web3 = new Web3('https://your-evire-node');

const contractABI = [ /* ABI from the compiled smart contract */ ];
const contractAddress = '0xYourContractAddress';
const dataLinker = new web3.eth.Contract(contractABI, contractAddress);

const dataHash = 'QmXoYP4F2zYF3...';
const description = 'Example data description';

dataLinker.methods.linkData(dataHash, description).send({ from: '0xYourAddress' })
    .on('receipt', function(receipt){
        console.log('Data linked:', receipt);
    });
  1. Retrieve Linked Data

Fetch the linked data from the smart contract using its ID.

dataLinker.methods.getData(1).call()
    .then(function(result) {
        console.log('Data Hash:', result[0]);
        console.log('Description:', result[1]);
        console.log('Timestamp:', result[2]);
    });

Benefits

  • Immutable References, with hashes stored on-chain serving as immutable references to the off-chain data, ensuring data integrity and security.

  • Data Integrity, by using cryptographic hashes, any alteration in the actual data will result in a different hash, making it easy to detect tampering.

  • Efficiency, by storing large data off-chain, reducing the storage burden on the blockchain, and improving performance and scalability.

  • Flexibility, allowing for the integration of various decentralized storage solutions, adapting to different application needs.

Considerations

  • Data Privacy, by ensuring that sensitive data is adequately encrypted before uploading it to decentralized storage.

  • Redundancy, through the utilization of multiple storage nodes and redundancy protocols to avoid single points of failure and enhance data availability.

  • Cost, by being mindful of the transaction costs associated with storing and retrieving data references on the blockchain.

Implementing data linking via smart contracts on the Evire blockchain provides a robust solution for maintaining the integrity and accessibility of off-chain data. By leveraging decentralized storage networks, this approach combines the strengths of blockchain immutability with the scalability of off-chain data management,

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Last updated 11 months ago

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