Guest Post

What are Blockchain Oracles?

Blockchain Oracles

Blockchain, the underlying technology behind many of today’s most popular cryptocurrencies, promises to revolutionize several industries with its decentralized ledger, transparency, and tamper-proof data. However, for blockchain-based applications and smart contracts to interact with the real world, they need reliable data inputs. This is where blockchain oracles come in.

What are Blockchain Oracles?

A blockchain oracle is a bridge between off-chain and on-chain environments. They provide a way for smart contracts on blockchain platforms to interact with external data sources. Whether it’s price feeds, temperature readings, or any other piece of external information, oracles make sure that blockchain-based applications get the data they need.

In the realm of decentralized finance (DeFi), for instance, smart contracts often need real-time data from the outside world to function properly, like the current price of a particular asset. Oracles facilitate this by fetching the required data from trusted sources and feeding it into the blockchain.

The Role of Blockchain Oracles in Crypto

Oracles play an essential role in enhancing the functionality and applicability of smart contracts. Without reliable external data inputs, the scope of smart contracts would be limited to the on-chain environment. Here are some of their main roles:

  • Data Verification: Oracles don’t just fetch data; they verify its authenticity too. This is especially crucial in applications where the accuracy and trustworthiness of data can make or break the system. For instance, discreet log contracts play an essential role in  the Bitcoin blockchain in helping to manage smart contracts on the blockchain. 
  • External Triggers: Certain smart contracts are designed to execute when specific conditions are met. Oracles can serve as the trigger for these contracts by supplying data that either initiates or halts a contract’s execution.
  • Enhancing Interoperability: Oracles enhance the interoperability between different blockchain platforms and the real world. By facilitating communication between on-chain and off-chain environments, they play a role in the broader adoption of blockchain technology.

Top Blockchain Oracles

As the demand for trustworthy and efficient oracles has risen, several projects have come to the forefront. Below are some of the top blockchain oracles at the time of writing.


Perhaps the most well-known oracle project in the crypto space, Chainlink offers decentralized oracle networks. This network allows multiple oracles to validate a single piece of data, ensuring accuracy and reducing the risk of manipulation.

BAND Protocol

BAND is a decentralized data oracle platform that aggregates and connects real-world data and APIs to smart contracts. Their flexible oracle design allows developers to choose their preferred data sources, ensuring optimal results.


An Ethereum-based decentralized oracle, Tellor utilizes a network of staked miners who compete to fetch data for smart contracts. This staking mechanism adds a layer of security, ensuring that miners have a stake in providing accurate data.

Oracle Pool

This is a decentralized oracle system on the Tezos blockchain. Oracle Pool leverages the power of the community to validate and deliver accurate data to smart contracts.


API3 offers a decentralized API network where data providers run their own nodes, thereby removing the need for third-party oracles. The model ensures that the data reaching the smart contract is direct from the source, reducing potential inaccuracies.


Blockchain oracles are vital cogs in the ever-evolving blockchain ecosystem. By bridging the gap between on-chain and off-chain worlds, they unleash the full potential of blockchain applications and smart contracts. 

As blockchain finds more real-world applications and the line between the digital and physical world continues to blur, the role of oracles is only set to grow. Whether you’re a developer, investor, or just a blockchain enthusiast, understanding the importance of these intermediaries will be crucial in the coming years.

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