What is Chainlink (LINK)?
- Author
- CRYPTO PORT Editorial
- Published
- Updated
- Reading time
- 6 min
In short
Chainlink is a decentralised oracle network that delivers off-chain data to smart contracts. Live since 2019, it is used across DeFi, primarily for price data. LINK is the token used to pay the node operators that supply that data.
Key points
- Fills the gap created by smart contracts' inability to read outside data
- Multiple nodes submit the same data and an aggregated value is written on-chain
- Also provides verifiable randomness and cross-chain messaging
- Many DeFi protocols rely on it for liquidation decisions
Definition
A decentralised oracle network that brings off-chain information to smart contracts through submissions from multiple independent nodes.
Smart contracts execute entirely inside the ledger and cannot call out to a website or API. This is the oracle problem. A rule like 'liquidate the collateral if ETH falls below a price' is useless unless someone writes that price on-chain. Chainlink exists to fill that gap.
Independent node operators each fetch a value from their data sources, submit it signed, and an aggregate is written on-chain. If one node reports a wrong or malicious value, aggregation limits the damage. Operators are paid in LINK, and some services require them to post LINK that can be slashed for misbehaviour.
It provides more than prices. Verifiable randomness (VRF) is used for game and NFT draws; automation triggers contract functions when conditions are met; and a cross-chain protocol (CCIP) moves messages and assets between blockchains, including in pilots with financial institutions.
The main uses all involve deciding amounts of money: valuing collateral in lending protocols, verifying stablecoin reserves, settling derivatives. Precisely because bad data here cascades into large losses, oracle design is inseparable from DeFi's safety.
Watch out for
- · Oracles are not infallible — if the source data is wrong, the wrong value lands on-chain
- · The operator set and source diversity differ from one feed to another
- · Holding LINK is not structurally tied to the network's fee revenue
Frequently asked questions
What happens if an oracle stops?
Prices stop updating, so liquidations or settlements may act on stale values. Most protocols pair the feed with staleness checks that pause operations.