How Can You Implement Off-Chain Data in a Blockchain Smart Contract?

#oracle #blockchaindata #web3 #ethereum

Problem Faced:
Smart contracts cannot directly fetch real-world (off-chain) data, such as asset prices, weather conditions, or sports scores.

Solution:
Use oracles like Chainlink to bring external data onto the blockchain.

Smart contracts request data from an oracle.
The oracle fetches data from trusted APIs and pushes it back on-chain.

Using Chainlink Price Feed:
solididty

pragma solidity ^0.8.0;
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

contract PriceConsumer {
    AggregatorV3Interface internal priceFeed;

    constructor() {
        priceFeed = AggregatorV3Interface(0x9326BFA02ADD2366b30bacB125260Af641031331); // ETH/USD on Rinkeby
    }

    function getLatestPrice() public view returns (int) {
        (,int price,,,) = priceFeed.latestRoundData();
        return price;
    }
}

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