What Are Blockchain Oracles?

June 10, 2022

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A blockchain oracle is a tool that connects real-world events and data to the blockchain. It provides a way to connect smart contracts with external data, including information from social media, weather services, and other sources. With the help of an oracle, smart contracts can be used for all sorts of things, from paying for electricity only when it rains in your area to buying tickets for a concert only if you are physically present at the concert venue.

Blockchain oracles are already being widely used by businesses around the world. In fact, it’s estimated that over 1 million people are already involved in this ecosystem. The most popular use cases for blockchain oracles include weather reports, personal data security (such as biometric authentication), insurance services, and finance-related applications, such as stock trading systems.

What Are The Different Types of Blockchain Oracles?

There are many different types of oracles, and they all have particular features that make them useful in different situations:

  • Source – Those that gather data from software, hardware, or both
  • The direction of information – Those that send data to the blockchain inbound or outbound
  • Trust – Centralized or decentralized oracle services

Software oracles are those that use software to gather data and then send it to the blockchain. The oracle can do this by either polling a source at regular intervals with a request for new information, or by receiving data from an external source. Hardware oracles are similar, but they gather information using sensors, devices, or other hardware components to retrieve data from the outside world.

The direction of information flow is another way in which blockchain oracles can be classified. Inbound oracles receive data from outside sources and send it directly onto the blockchain. Outbound oracles gather data from external sources, process it in some way, and then send it back out again as part of their own output.

Finally, trust is another factor that defines how an oracle works: centralized vs. decentralized. Centralized means that there is one central authority that manages all aspects of an oracle’s operation; they control both what happens inside and outside of that system. Decentralized means multiple parties are working together to accomplish some task; they may even have competing interests within their own system.

How Do Blockchain Oracles Work In Crypto?

The term “oracle” typically refers to a computer program that can access data from an outside source and use that information to make decisions. In the blockchain world, oracles are one of the key ways that smart contracts can interact with the outside world.

Since smart contracts are executed automatically by computers, they need a way to pull data from outside sources to make decisions. This is where oracles come in — they provide access points for smart contracts to receive information about things like stock prices, weather conditions, or even the winner of a sporting event. Oracles are essentially gatekeepers for the real world. They are what allows smart contracts to make decisions based on events that happen outside of their own system, and without them, blockchains would be pretty limited in what they could do.

In the case of cryptocurrency trading, an oracle can provide information about things like weather conditions, oil prices, gold prices, or even currency exchange rates. This information is provided by third parties who have no stake in the outcome of your transaction. They are just providing you with knowledge about what’s going on in the world so you or the system can make informed decisions.

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How Do You Join a Blockchain Oracle Pool?

To join an oracle pool, you need to create a wallet to receive your rewards and a wallet to send your payments. Both wallets need to be on the same cryptocurrency network. The good news is that there are many different types of wallets available for different types of cryptocurrencies, so it is easy to find one that suits your needs and preferences.

Once you have chosen the correct type of wallet for your desired blockchain oracle pool, all that’s left to do is download it from the official website and install it on your computer or mobile phone device. This usually only takes a few minutes depending on how much experience you have with installing software programs onto computers or mobile phones before.

Why Would I Want to Use Blockchain Oracles?

We have all had to deal with corrupted files and lost data before. It’s frustrating, but also expensive: if you are running a business that relies on accurate financial data, for example, it can cost you thousands of dollars every time you lose track of some records. But with blockchain oracles, you can store your data in one secure place where nobody has access without your permission and nobody can delete it or change it without your permission either.

Oracles are crucial because they provide us with access to real-world data. Without them, investors would all be stuck relying solely on their subjective experiences and opinions.

The Blockchain Oracle Problem

The Oracle Problem is a problem that plagues blockchain oracles as they seek to provide data to blockchains. In simple terms, oracles are responsible for providing data from outside the blockchain to the blockchain. This can be used in cryptocurrency, where an oracle might provide the price of gold to a blockchain, but this presents a problem when the data provided by an oracle can’t be trusted.

The problem arises because blockchains are built on trustless systems. To put it simply: if you are using a blockchain, you don’t need to trust anyone else but yourself and your computer. But, for an oracle to work on a blockchain, you have to trust them.

If they lie about what they have provided, then they could alter the course of history. For example, if someone were able to change what an oracle said about gold prices by telling their lies about how much gold costs at different times and places over time, then it would be possible for them to manipulate those prices in their favor, which is bad news for everyone else who uses that same system.

Solving The Blockchain Oracle Problem

Chainlink is a blockchain-based middleware that enables smart contracts to access data from external sources in a secure way. It allows you to create oracles that can provide data from outside the blockchain, and it does so by leveraging the network of Chainlink nodes.

Chainlink’s oracles are decentralized and tamper-proof, which means that they are not under the control of any one party. This has several benefits:

  • The oracle does not have any single point of failure, so there’s no way for someone to take down the system by attacking a single oracle.
  • The data from each oracle is validated by multiple nodes before being sent back onto the chain and recorded in history, making sure that there is no chance of any malicious tampering with that data once it’s been recorded on-chain.


Blockchains are being used by people to bring forth new and exciting ideas, from cryptocurrencies to ICOs to Proof-of-Existence etc. While the future is still uncertain for blockchain technology and its implications as it becomes more mainstream, one thing is clear: these technologies will continue to change the way we interact with one another.