Smart coracts implemeed on the blockchain platform have a high poteial to increase efficiency as well as reduce transaction costs in many industries. The smart coract reduces the risk of breach of coract between the transaction parties and creates transparency, but it still has limitations. One of these limitations is the need for external data and technology Oracle It was created to solve this limitation.
In this article we examine that What is Oracle? And what are its types and how it transfers information from the outside world to the blockchain world. We will also have a look at the curre problems of oracles and ways to improve them. Stay with us.
What is Oracle?
Oracle One Applied technology in the world Blockchain is that Information from the outside of smart coracts to the inside and information from the inside to the outside Transfers. Sometimes smart coracts need real-world information outside the blockchain. Oracles provide this information. For example, an oracle can provide price information to a smart coract created to sell or re real estate.
Oracles and smart coracts
The concept of smart coracts was first proposed by Nick Szabo in the early 1990s, and his prediction regarding their implemeation and application came true in an ieresting way!
At a high level, a smart coract is a computer program consisting of codes that define its function and state. Smart coracts are usually executed on a blockchain automatically, fully transparely, under certain conditions and in a deceralized network. Since smart coracts run on blockchains, they are immutable.
Read more: What is a smart coract? How does Smart Coract work?
By using smart coracts, iermediaries are eliminated and transaction costs are reduced. The application of these coracts is based on codified parameters and varies from legal coracts to payme systems.
Despite their obvious benefits, smart coracts do not have much capacity due to being limited to on-chain data of a blockchain. Ieraction with the real world as well as execution under conditions outside the blockchain network where they are located are among the limitations of these coracts.
What are the uses of oracles?
The idea of oracles as well as deceralized oracles has been proposed for several years and discussions have been raised about how to impleme and trust them.
Oracles retrieve and verify data from external sources through web APIs and market data for blockchains and smart coracts. The data that smart coracts need include information such as prices, weather, or even generating random numbers for gambling.
Oracles are placed between the blockchain and data sources and provide the information required by the blockchain by executing queries. Therefore, smart coracts can be executed based on the information provided by oracles.
Data sources in real-world markets and web APIs, such as blockchains and smart coracts, are not deterministic. Oracles act as a bridge and transform this external and uncertain information io an understandable and executable format for the blockchain.
In fact, these oracles form the basis of platforms such as Augur. Agar is a deceralized prediction market that has a complex oracle that takes user behavior as input. Augur also uses oracles to report the results of accurate market predictions.
Types of oracles in blockchain
The main types of oracles that we deal with today are:
- Hardware oracles
- Software oracles
- Consensus based oracles
- Incoming oracles
- Output oracles
Hardware oracles
There are sensors that are iegrated with tangible physical objects. Supply chain tracking using radio frequency ideification system (RFID) tags to record information such as the environmeal conditions of products and goods inside the blockchain is an example of this type.
Software oracles
The most common type are oracles that can pull data from other sources, such as web APIs, and can also include real-world information such as flight status and weather.
Consensus based oracles
These types have taken a step towards deceralized oracles and rely on collecting information from several oracles with specialized methods and determining their validity and accuracy.
Incoming oracles
They are associated with scenarios such as “if it happens then do it” and with software oracles that say “if this price matches the curre asset then do the purchase”.
Output oracles
They allow smart coracts to send data to sources outside of the blockchain network on which they reside.
The problems of oracles
The extraordinary ability of oracles to connect off-chain and on-chain data as an iermediary between traditional networks and blockchain networks has importa long-term implications. However, The main problem is that these oracles originate from ceralized sources that usually require external permissions, and this is where blockchain has a problem.
Jimmy Song has provided a good analysis of the fundameal problems with oracles and smart coracts. The problems of oracles More in coext security, Validity And the trust occurs between other oracles and the unreliable execution of smart coracts.
In the coext of connecting a physical asset to the blockchain, oracles have no ability to verify ownership of an asset, such as when a house is transferred to another person, without a third party, even if the new owner keeps a token on the blockchain that represes ownership.
Ownership in smart coracts does not always transfer to real-world ownership. As a result, the smart coract in the form of an oracle requires the process of verifying eves from other departmes.
Oracle's best blockchain projects
The best Oracle projects are those that solve many of Oracle's problems by creating deceralized solutions, using consensus-based oracles, deceralized markets, and new autheication methods.
The best Oracle projects that we iend to iroduce and review in this section are:
- Chain Link
- Band Protocol
- API3
- Pyth Network
- Flare Network
Chain Link
Chainlink offers an attractive deceralized solution for validating data provided through Oracle as well as smart coract output data. Chainlink realized the problem that the ceralized Oracle has a single poi of failure and proposed a solution to create a middleware that includes Oracle's deceralized network. Most importaly, China will ideify and validate the data link before it is used in smart coracts.
Chainlink's on-chain ierface consists of oracle nodes that respond to queries generated by smart coracts. The in-chain ierface consists of three compones:
- Legal coract
- Coract according to the order
- Collection coract
Legal coract: It uses a proprietary method to collect and track data from Oracle service providers.
Coract according to the order: Receives a Service Level Agreeme (SLA) and registers data compones at the same time as receiving bids from Oracle providers.
Collection coract: It gathers the answers of the Oracle providers and calculates the final result of the initial query of the chain link.
Aggregating data from multiple oracles eliminates dependency on a single system and helps ensure data iegrity. Data from Oracle providers is also se back to the credit agreeme to manage Oracle's accuracy through a validation system.
Using a Service Level Agreeme (SLA) is critical to the Oracle selection process. Users requesting oracle data can explicitly ideify the parameters and inputs they are looking for, as well as the number of oracles they wish to use.
The distributed source of the Oracle Chainlink platform and its data collection is more efficie than methods that directly use an external data source.
Band Protocol
Protocol Band is a deceralized oracle with a focus on scalability and flexibility. The project uses the Delegated Proof of Stake consensus mechanism for its network of Oracle nodes.
Band protocol has a native token called BAND, which is a tool for governance and maiaining network security. Validators stake their BAND tokens and thereby coribute to the security of the network. Of course, they receive rewards for this work.
Read more: What is staking? Complete training on staking or investing in digital currencies
Another positive feature of the protocol is its ieractivity with differe blockchains. The ability to transfer information between differe chains is a practical and importa possibility that the protocol section supports.
API3
API3 is a project that connects traditional APIs to blockchain. This project actually allows API providers to run their own nodes and thus provide data directly to blockchains without the need for iermediaries.
This unique API to smart coract ierface, along with deceralized governance and efforts to eliminate iermediaries, has made API3 a successful project in the Oracle space. The creative approach of this project in connecting traditional data sources to the blockchain world has led to its success and popularity.
Pyth Network
Payet Network focuses on financial markets and offering pricing to blockchain applications. This project receives its data from several reliable sources and then transforms them io such a state. Freque updates, focus on financial markets, and cooperation with professional data providers are among the strengths of Peyt Network.
Flare Network
Flair Network aims to facilitate the transfer of data between blockchains and the Iernet. This project iegrates Ethereum smart coracts with the Ollench consensus protocol. In this way, it guaraees speed along with security. Iegration with Ethereum smart coracts along with support for non-Turing tokens such as Ripple can be considered the strength of Flair Network.
Read more: What is Ripple? Everything about Ripple and XRP digital currency
Frequely asked questions
A smart coract is a type of blockchain-based coract that is executed automatically and does not require an iermediary. Oracle is a differe innovation that moves data from the real world outside the blockchain to the smart coract.
no Not all blockchain applications necessarily require Oracle.
The reliability and performance of the Oracle you choose plays an importa role in this issue. It is better to pay atteion to the data sources of oracles and the method of collection and transmission they use, and preferably use deceralized oracles that collect data from several differe sources.
final word
To make a lasting impact on applications and industries, blockchain must be able to communicate with real-world data. This is difficult and challenging with oracles. So far, significa progress has been made in this matter, and the communication between blockchains and real data is a big step for the developme of this technology.
