Chainlink
LINK
Chainlink (LINK) is a decentralized oracle network that provides real-world data to smart contracts on the blockchain. Smart contracts are self-executing agreements, but they cannot access data from outside their native network (off-chain data). Chainlink solves this "oracle problem" by acting as a secure bridge between blockchains and external data sources, such as market prices, weather information, or sports results. This service is fundamental for the functioning of many decentralized finance (DeFi) applications, dynamic NFTs, and other advanced blockchain use cases. The network's native cryptocurrency, LINK, is used to pay Chainlink node operators for providing these critical data services.
Who created Chainlink? Chainlink was co-founded by Sergey Nazarov and Steve Ellis. The project's foundational whitepaper was published in 2017, and its mainnet was launched on the Ethereum blockchain in 2019. The underlying company, SmartContract, was founded in 2014 with the initial goal of building bridges between external data and smart contracts.
How does Chainlink work? When a smart contract requires external data, it places a request on the Chainlink network. A network of independent, decentralized computers, known as Chainlink nodes, retrieves the requested information from multiple external sources. These nodes then aggregate and validate the data to ensure its accuracy and reliability before delivering a single, trusted data point back to the smart contract. This decentralized approach eliminates single points of failure and ensures the data fed to smart contracts is tamper-proof. Chainlink has since expanded to offer other services, such as the Cross-Chain Interoperability Protocol (CCIP), which enables smart contracts to communicate and interact across different blockchains.