Since their creation, blockchains have created a trillion-dollar ecosystem, mostly based on cryptocurrencies, but the way they were designed naturally has some limitations. Blockchains aren’t able to collect external data, also known as off-chain data. Without collecting it, they would be very limited on what they could execute and support, and that’s where Oracles take place.

Blockchain oracles are third-party entities that deliver relevant outside information to smart contracts in a decentralized finance system, providing them with accurate insights to be safely executed.

What Is an Oracle in Blockchain?

Just as the name suggests, an oracle is an external entity from a system that brings insights into a blockchain, based on relevant information available on the world outside the scope of that network. It is a very valuable service because it allows for external links to be made in order to help smart contracts to run smoothly. Basically, it connects inputs and outputs of data. That is a necessity because blockchains and smart contracts are unable to access off-chain information, even though that can be vital to the proper execution of the terms in a contract.

In Decentralized Finance, the use of smart contracts - digital agreements, programmed to automatically activate according to the parameters set - is very common, and the existence of a computational service capable of bringing together both the reliability of the blockchain with relevant outside information, is a very powerful prospect.

Blockchain oracles help broaden the way smart contracts are able to function, in a more realistic way. While they are not the original source of data, they work as a layer in-between the chains and the external data, relaying the authenticated information. Within the network the data flow is very thorough, secure and vast, but it is not sensitive enough to attend to the new information influx coming about with everyday life.

Types of Blockchain Oracles

Where Blockchain can at times be considered a self-contained system, limited only to the information contained within, the use of oracles is able to fulfill most information gaps within the chains, enabling fast access to multiple different types of data, news and computational power. How this type of technology will ultimately operate depends mostly on what it is designed to do, and what is its relevance to the smart contracts and blockchain data it supports.

In a nutshell, oracles are capable of expanding decentralized digital contracts by providing the blockchain with extra data resources, without altering its original characteristics or impacting the validity protocols in place. In order to fulfill the large amount of data resources it can acquire, they may vary in type, depending on the function they could have.:

Input Oracles

This type of oracle is the most widely used today. Input oracles gather off-chain data and then input it onto a blockchain network to inform smart contracts, usually providing them with on-chain access to information from the financial market.

Output Oracles

Output oracles are the opposite of input ones, meaning that instead of acquiring and distributing information from outside in, they take an order from inside out. Through that, smart contracts are capable of sending orders to off-chain systems, for instance: to allow payments, asking for certain services to be provided, or even aiding in logistics matters.

Compute-Enabled Oracles

Compute-Enabled oracles are becoming quite popular in blockchain. They use off-chain computational power to provide on-chain services that for many reasons would not be easy to implement otherwise. These oracles can be applied in automation of smart contracts, data analysis and privacy, as well as cybersecurity.

Cross-Chain Oracles

This type of oracles is capable of writing and interpreting information between different blockchains, lending a better range of interoperability between two networks, helping to move assets and data, as well as creating triggers in-between both systems that may be triggered by certain actions.

Source: Chainlink

Oracles use cases

The use of this technology has potential to be applied over many different fields, and for multiple purposes. A few good examples of fields that rely on oracles, and their uses are:

• NFTs: One of the most famous uses of oracles is in the NFT field, generating randomness, selecting winners in drops and creating a more unpredictable game play;

• Decentralized Finance (DeFi): Accessing financial information, assessing borrowing capacity and estimating the value of an asset according to others;

• Business management and IT: through oracles, companies are able to quickly and efficiently connect to blockchains as well as implement improvements and adapt it to their goals;

• Insurance: through IoT, oracles are able to verify insurable claims, run background checks and verify payment abilities of a client.

Another trend that is very much becoming a reality is the Internet of Things and the Multiverse. It brings about both a strong sense of excitement, as well as many concerns about data privacy, user and company security, as well as the need for useful products. Oracles can very much help on that front, by expanding the security of the block through inter-exchangeability and creating automated smart contracts that are both fast and focus on the needs of its users.

Oracles also have a great potential in aiding in the diminishing of bureaucracy in transactions that are often time-consuming, like waiting on loan approvals from financial institutions, intercommunication between decentralized finance systems and the traditional banking system and also creating self-service solutions that do not rely on a costly customer service structure.

Conclusion

The problem of finding ways to both expand and improve communications between a blockchain network and the off-chain reality is a strong concern in regards to this technology. Blockchain points to being the future of data, and innovation is a constant in this field.

Oracles show to be efficient in bridging that gap and lending more safety and functionality, expanding networks and lending interactivity to a system once thought to be shut-in. If blockchain technology is able to acquire mass adoption in the next few years, part of the credits should be given to the advent of Oracles in the system.