Chainlink: Everything to Know

By  Beluga Research August 2, 2023

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  • Chainlink is a decentralized oracle network that connects smart contracts with real-world data, enabling secure and reliable blockchain interactions
  • It operates on the Ethereum blockchain but supports other blockchains as well, ensuring smart contracts can access accurate data from various off-chain sources
  • Chainlink's decentralized oracle network consists of a vast ecosystem of nodes fetching and verifying data
  • The network's decentralized approach ensures security, reliability and resistance to manipulation


Chainlink is a decentralized oracle network that connects smart contracts with real-world data, enabling secure and reliable blockchain interactions. Often referred to as LINK, Chainlink launched in 2017 by Sergey Nazarov and Steve Ellis. It operates as a decentralized oracle network built on the Ethereum blockchain, though it has since expanded its support to other blockchains.

Oracles serve as intermediaries that fetch data from off-chain sources and deliver it to smart contracts on the blockchain. Chainlink's primary goal is to ensure smart contracts can access accurate and reliable data from various sources, including APIs, web services and other external systems.

A Brief History

Chainlink's journey began with its initial coin offering (ICO) in September 2017, where it raised around $32 million. The project quickly gained traction within the blockchain community due to its innovative approach and the potential impact it could have on the broader adoption of smart contracts. In 2019 Chainlink launched its mainnet, transitioning from a project in development to a fully operational decentralized oracle network.

  • Decentralized oracle network. Chainlink's core technology revolves around its decentralized oracle network. This network consists of a vast ecosystem of nodes, known as Chainlink nodes, that retrieve and verify data from external sources. These nodes are operated by independent individuals, organizations or data providers who have a stake in the Chainlink ecosystem. By distributing the responsibility of data retrieval and validation among multiple nodes, Chainlink ensures a high level of security, reliability and resistance to manipulation.
  • Node operators and data providers. Node operators play a crucial role in the Chainlink network. They are responsible for retrieving data from external sources and delivering it to smart contracts. Node operators are incentivized through LINK tokens, the native cryptocurrency of Chainlink, which is received as compensation for their services. Data providers, on the other hand, are entities that supply data to the Chainlink network. These can be trusted data providers, such as established APIs or decentralized data sources, like other blockchains or IoT devices.
  • Decentralized data oracles. Chainlink's decentralized oracle architecture ensures that data fed into smart contracts is tamper-proof and trustworthy. When a smart contract requires specific data, it sends a request to the Chainlink network. Chainlink nodes then compete to fulfill the request by retrieving the requested data from off-chain sources. The retrieved data is then aggregated and validated by multiple nodes to ensure accuracy. This decentralized approach minimizes the risk of a single point of failure or manipulation, providing smart contracts with reliable and secure data inputs.
  • External adapters. Chainlink allows the integration of external adapters, which are custom modules that enable smart contracts to interact with specific APIs or external systems. These adapters expand the capabilities of Chainlink by enabling the retrieval of data from a wide range of sources. They serve as bridges between the Chainlink network and various off-chain systems, enabling smart contracts to access data that is not directly available on the blockchain.
  • Reputation system. Chainlink incorporates a reputation system to incentivize node operators to provide accurate and reliable data. Each node in the network has a reputation score that reflects its historical performance and the quality of data it provides. Smart contracts can use this reputation score to select the most trustworthy nodes for retrieving data. Furthermore, Chainlink's reputation system encourages node operators to stake LINK tokens as collateral, which can be forfeited in case of malicious behavior or data manipulation.
  • Chainlink price feeds. One of the prominent use cases of Chainlink is providing reliable price feeds for decentralized finance (DeFi) applications. Chainlink Price Feeds deliver accurate and up-to-date price data from a variety of sources, ensuring the integrity of DeFi protocols that rely on accurate asset valuations. This feature has become vital in DeFi, where precise pricing information is critical for functions such as collateralization, automated market-making and liquidations.

Getting Started

To understand Chainlink, it's essential to grasp the concept of smart contracts. Smart contracts are self-executing contracts with predefined rules and conditions encoded on a blockchain. They automatically execute when these conditions are met, eliminating the need for intermediaries and enhancing transparency and efficiency. However, smart contracts are limited in their ability to access data outside the blockchain. This is where Chainlink comes in.

Chainlink acts as a decentralized oracle network, providing a secure and reliable connection between smart contracts and real-world data. Oracles are entities that fetch and verify external data and deliver it to the blockchain, enabling smart contracts to interact with the outside world. Chainlink's decentralized architecture ensures the integrity and accuracy of the data by aggregating information from multiple sources and using cryptographic techniques to validate and verify it.

Developers can integrate Chainlink into their smart contracts to access a wide range of off-chain data, such as price feeds, weather data, sports scores and more. This opens up a plethora of possibilities for blockchain applications across various industries, including finance, insurance, supply chain, gaming and decentralized finance (DeFi).

Unique Aspects

One of the unique aspects of Chainlink is its decentralized approach to oracles. Traditional oracles rely on a single centralized entity to fetch and deliver data, which introduces a single point of failure and potential manipulation. In contrast, Chainlink leverages a decentralized network of independent oracles, known as node operators. These node operators retrieve and verify data from multiple sources, ensuring the accuracy and reliability of the information.

Another notable aspect of Chainlink is its ability to handle off-chain computations. While most smart contracts are limited to executing operations solely on the blockchain, Chainlink enables the execution of complex computations and data processing off-chain. This is achieved through Chainlink's external adapters, which connect the smart contract to external systems and allow for off-chain computations. This capability enhances the flexibility and functionality of smart contracts, enabling them to perform more advanced tasks.


  • Enhanced data connectivity. Chainlink enables smart contracts to access and utilize data from various external sources, such as APIs, databases and payment systems. This connectivity expands the range of applications that can be built on blockchain platforms, allowing smart contracts to interact with real-world events and data.
  • Decentralization. Chainlink leverages a decentralized network of node operators to retrieve and verify off-chain data. This decentralized approach ensures no single point of failure exists, making it more resistant to censorship, manipulation or data tampering. It also enhances the security and reliability of data provided to smart contracts.
  • Security and trustworthiness. Chainlink utilizes cryptographic techniques and reputation systems to ensure the integrity and accuracy of the data it retrieves. It employs multiple nodes to fetch data and aggregated responses to provide a reliable and trustworthy data feed. This approach minimizes the risk of malicious or inaccurate data impacting smart contract execution.
  • Flexibility and customizability. Chainlink offers a wide range of customization options for developers. It allows them to specify the data sources, APIs and parameters they want to integrate into smart contracts. This flexibility empowers developers to tailor applications according to specific requirements, making it suitable for various industries and use cases.
  • Interoperability. Chainlink is designed to be compatible with different blockchain platforms, enabling interoperability between smart contracts on different networks. This interoperability expands the reach and potential impact of Chainlink, as it can be integrated into various blockchain ecosystems, such as Ethereum, Polkadot and Binance Smart Chain.


  • Centralization risks. While Chainlink aims to be decentralized, the network relies on a set of node operators to retrieve and provide off-chain data. If a significant portion of these nodes is controlled by a single entity or a small group of entities, it could introduce centralization risks. However, Chainlink has taken steps to mitigate this risk by continuously expanding its network of node operators.
  • Dependency on external data. Chainlink's functionality heavily relies on the availability and accuracy of external data sources. If the selected data sources experience downtime, provide inaccurate data, or get compromised, it can impact the execution and reliability of smart contracts relying on that data. Therefore, the quality and reliability of the selected data sources are crucial for the proper functioning of Chainlink-based applications.
  • Potential security vulnerabilities. While Chainlink has implemented various security measures, any complex system is susceptible to vulnerabilities. Smart contracts relying on Chainlink's data feed must be carefully audited and tested to identify and mitigate potential security risks. Additionally, the security of the nodes and the integrity of the data they provide are critical factors that need to be continuously monitored and maintained.
  • Cost of data retrieval. Chainlink's decentralized oracle network involves costs related to data retrieval and aggregation. These costs can vary depending on the complexity and frequency of data requests. Developers and users of Chainlink-based applications need to consider these costs and ensure they are economically viable for their specific use cases.
  • Adoption and competition. While Chainlink has gained significant adoption and popularity, it faces competition from other oracle solutions in the market. The success and widespread adoption of Chainlink depends on its ability to maintain a competitive edge, continuously innovate and provide value-added features that differentiate it from other oracle providers.