What is Chainlink: Connecting Blockchain with the Real World

CoinW Exchange
6 min readJan 8, 2024
Photo by Shubham Dhage on Unsplash

Chainlink, often referred to as the “oracle network” of the cryptocurrency world, has carved its niche by connecting the isolated realm of blockchains with real-world data. But what exactly does this mean, and what makes Chainlink such a vital piece of the blockchain puzzle? Let’s delve into its intricacies.

What is Chainlink?

Imagine a software that reacts to live weather data to trigger insurance payouts to farmers in the event of crop failure due to flooding. How can this software access data outside the blockchain?

This is where Chainlink comes in.

Chainlink is a decentralized oracle network, fetching real-world data through a network of nodes and securely delivering it to smart contracts. This “oracle” moniker aptly represents Chainlink’s role as a trusted intermediary between blockchains and external information.

Launched in 2017, Chainlink started as an Ethereum-based oracle network. However, it has evolved into a blockchain-agnostic platform serving projects across various blockchains like Polygon, BNB Chain, and Avalanche. This adaptability has fueled its widespread adoption among DeFi (decentralized finance) protocols, NFT marketplaces, and even traditional enterprises seeking blockchain integration.

Chainlink’s native token is LINK, which is trading for around $13 in Jan 2024, ranking as the #14 largest cryptocurrency with a market cap of approx. $7 billion.

How Does Chainlink Work?

Chainlink’s core function of bridging the gap between blockchains and real-world data involves a fascinating interplay of technology and design. Let’s delve into the mechanisms that power this oracle network:

1. Decentralized Network of Nodes:

  • Chainlink operates through a network of independent nodes run by individuals or organizations.
  • These nodes fulfill data requests from smart contracts by fetching the required information from various external sources (APIs, websites, data feeds).
  • Each node competes to fulfill requests, ensuring no single entity controls the data flow and upholding decentralization.

2. Smart Contract Requests:

  • Developers specify data requirements within their smart contracts,clearly defining the type of information needed and acceptable sources.
  • Contracts broadcast these requests to the node network, initiating the data retrieval process.

3. Reputation and Staking:

  • To participate in the network and fulfill requests, nodes must stake LINK tokens, Chainlink’s native cryptocurrency.
  • Staking serves as a security measure, ensuring nodes behave truthfully and are incentivized to provide accurate data.
  • Nodes with a good track record (reputation) are prioritized for fulfilling requests, further promoting reliable data delivery.

4. Decentralized Consensus Mechanism:

  • Multiple nodes respond to each data request, fetching the information from authorized sources.
  • These responses are aggregated through a decentralized consensus mechanism, typically off-chain, to ensure data accuracy and tamper-proof results.
  • The aggregated data is then delivered back to the requesting smart contract on the blockchain.

However, despite its success and innovations, Chanlink has faced several controversies over its journey.

Some argue that Chainlink’s use of centralized data providers or APIs contradicts its goal of decentralization. While the network itself is decentralized, relying on centralized data sources introduces vulnerability and dependence on trusted third parties.

The recent controversy surrounding Chainlink reducing the required signatures in its multisig wallet further fueled claims of centralization,raising concerns about its overall governance and decision-making processes.

Criticisms also point towards Chainlink’s reliance on off-chain mechanisms, which could introduce potential security vulnerabilities depending on the specific implementation.

Chainlink has addressed some of these concerns through ongoing development and improvements to its protocol. However, these controversies are complex and often have nuanced arguments on both sides.

Ultimately, the validity of these criticisms and the impact they will have on Chainlink’s long-term success remain a subject of ongoing debate and speculation within the cryptocurrency community.

What is Chainlink Used For?
Chainlink’s versatility has led to its integration in a diverse range of projects, solidifying its role as a key infrastructure element in the blockchain space. Here are some notable successful use cases:

Decentralized Finance (DeFi):

  • Synthetix: Chainlink feeds real-world asset prices directly into Synthetix’s synthetic asset contracts, enabling the creation of tokens that track the price of real-world assets like stocks, commodities, and fiat currencies.
  • Aave: Chainlink secures interest rate calculations and liquidations in Aave’s DeFi lending protocol, ensuring accurate calculations and fair market execution.
  • Uniswap: Chainlink price feeds power the dynamic exchange rates on Uniswap’s decentralized exchange, facilitating seamless token swaps and liquidity management.

Gaming and NFTs:

  • Axie Infinity: Chainlink’s Verifiable Random Function (VRF) is used in Axie Infinity’s breeding system to generate provably fair random outcomes for monster traits, creating a more engaging and unpredictable gameplay experience.
  • Enjin: Chainlink powers Enjin’s JumpNet, a blockchain specifically designed for gaming, by providing secure asset transfers and verifiable data feeds for in-game items and transactions.
  • OpenSea: Chainlink’s price feeds are integrated into OpenSea, the largest NFT marketplace, for accurate price discovery and market analysis of various NFT collections.

Real-World Applications:

Arbol uses smart contracts and Chainlink oracles to provide anyone with blockchain-enforced weather coverage (Source: Arbol/Medium)
  • Chainlink Price Feeds: Widely used across various blockchain projects,Chainlink Price Feeds provide trusted access to real-time market data from numerous financial institutions and exchanges, enabling reliable pricing mechanisms for a variety of use cases.
  • Theta Network: Chainlink helps combat ad fraud on Theta Network’s video delivery platform by verifying viewership data through secure off-chain computation.
  • Arbol: Chainlink integrates weather data into Arbol’s insurance products, creating weather-based risk management solutions for farmers and other stakeholders.

These are just a few examples, and the list of successful Chainlink use cases continues to grow as developers leverage its flexibility and reliability to build innovative applications across various sectors.

Chainlink Latest Development: A Suite of Web3 Services

Chainlink has expanded its repertoire beyond basic oracles. It now offers a plethora of Web3 services, including:

  • Data feeds: Continuously deliver market data, weather information, or other real-time updates to smart contracts.
  • Verifiable Random Function (VRF): Generate provably fair random numbers on-chain, crucial for games and lotteries.
  • Proof of Reserve: Verify the asset holdings of DeFi protocols,enhancing transparency and trust.

Chainlink Price: Is Chainlink a Good Investment?

Chainlink price history over the years (Source: CoinMarketCap)

Like all other cryptos, Chainlink has experienced significant volatility over its lifespan, both during bull and bear markets. The DeFi boom in 2020 was a major driver of its price surge,demonstrating its connection to the overall blockchain ecosystem. Here’s a quick roundup of its price history:

  • 2017: Launched at $0.11, initially hovering around that price point for most of the year.
  • 2018–2019: Bear market saw a drop to as low as $0.30, followed by a slow recovery.
  • 2020: DeFi boom propelled Chainlink to an all-time high of $52.88 in May 2021.
  • 2021–2022: Price fluctuated significantly, falling to around $7 in June 2022.
  • 2023: Rebounded to mid-$15 range, showcasing some stability with occasional spikes.
  • 2024 (so far): Currently hovering between $13 to $18.

Ultimately, the question of whether any crypto can be considered a good investment needs to factor in investment horizon and risk tolerance–sell at the wrong time because you cannot tolerate the volatility and it will be a bad investment. At the same time, the best indicator of the investment potential for any crypto is in its utility, if there is a sound use case and proof of concept, the chances of it being a good investment will be much higher in the longer term. This is why research and patience are critical ingredients to see profits in crypto investing.


Chainlink’s unique ability to bridge the gap between blockchains and the real world makes it a cornerstone of the Web3 revolution. It empowers developers to build trust-worthy, data-driven applications, paving the way for a future where blockchains seamlessly interact with the world around us. While challenges and debates remain, Chainlink’s decentralized oracle network stands as a testament to the power of collaboration and innovation in the ever-evolving world of cryptocurrency.



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