Chainlink (LINK) LINK

Chainlink (LINK) is a decentralised oracle network: it connects blockchains to data and systems that live outside them, such as market prices, interest rates or reserve audits. Without this kind of bridge, a smart contract cannot know the price of an asset or the result of an event. LINK is the token used to pay node operators and to stake for the network’s security. Here is how Chainlink works, its history, its uses and its risks.

What is Chainlink?

Blockchains are closed systems: they can verify their own transactions, but not what happens in the outside world. This is the “oracle problem”. Chainlink was created to solve it with a network of independent node operators who fetch, check and publish data on-chain.

The project was created by Sergey Nazarov and Steve Ellis. Its first whitepaper, published on 4 September 2017, was co-written with Cornell professor Ari Juels. The company behind it, Chainlink Labs, still leads most development, alongside a large ecosystem of node operators and partners.

How Chainlink works

Decentralised oracle networks

An oracle on Chainlink is not a single server but a network of nodes. For a price feed, each node collects prices from several data providers; the results are aggregated into a single value that is written on-chain and used by smart contracts. Because many independent operators take part, a single faulty or dishonest source has less impact.

The main services

• Data Feeds: asset prices used by lending protocols, derivatives and stablecoins.
• CCIP (Cross-Chain Interoperability Protocol): messages and token transfers between blockchains, introduced in 2023.
• Proof of Reserve: on-chain checks of the reserves backing a token, launched in 2020.
• Automation: triggers that execute contract functions when conditions are met.

The LINK token and staking

LINK is a token on Ethereum with a fixed supply of 1 billion units; no new LINK can be created. It is used to pay node operators and to back the network’s security through staking: stakers lock LINK and can be penalised if the service they secure fails. Since 2025, a mechanism called Payment Abstraction lets users pay for Chainlink services in other assets, such as gas tokens or stablecoins, which are then converted into LINK.

A short history of Chainlink

• September 2017: publication of the first whitepaper.
• 30 May 2019: launch of the Chainlink network on Ethereum mainnet.
• April 2021: “Chainlink 2.0” whitepaper, describing a broader vision of decentralised oracle networks.
• 6 December 2022: staking v0.1 goes live in beta, with a pool capped at 25 million LINK.
• 2023: CCIP launches; experiments with SWIFT on connecting banks to blockchains are published in August.
• 28 November 2023: start of staking v0.2, with a pool raised to 45 million LINK.
• 7 August 2025: launch of the Chainlink Reserve, an on-chain reserve that accumulates LINK from service revenue.
• 2 December 2025: Grayscale’s Chainlink Trust ETF (GLNK) starts trading on NYSE Arca, the first US ETF tracking LINK.

What is Chainlink used for?

Chainlink price feeds are used across DeFi by lending, derivatives and stablecoin protocols to value collateral and trigger liquidations. Banks and financial institutions have also tested Chainlink in tokenisation pilots; in November 2024, for example, SWIFT, UBS Asset Management and Chainlink ran a pilot under a Monetary Authority of Singapore programme.

Chainlink vs other oracles

Chainlink is the oldest and most widely integrated oracle network, but it faces competitors such as Pyth, which relies on data published directly by trading firms. Chainlink is not a blockchain itself: it is middleware that runs on top of many networks.

Risks and criticism

• Systemic dependence: a wrong or delayed price feed can trigger unfair liquidations in the protocols that rely on it.
• Centralisation of decisions: Chainlink Labs and a selected set of node operators still play a central role in configuring feeds.
• Token value capture: critics question how much of the network’s usage turns into demand for LINK, which the Reserve and Payment Abstraction aim to address.
• Smart contract risk: staking and cross-chain transfers add technical risk.
• Volatility: LINK can lose a large share of its value.

How to store LINK

LINK is listed on all major exchanges. As an Ethereum token, it can be kept in any Ethereum-compatible wallet or on a hardware wallet that supports Ethereum tokens. Always check the official contract address on chain.link before receiving LINK, and keep your recovery phrase offline.