A Guide to Understanding Blockchain Oracles | HackerNoon

Oracles are third-party services that provide blockchain platforms with information about external real-world events as well as external digital events. - by ShaanRay oracle blockchainoracles

Blockchain platforms' decentralized and distributed nature makes them secure and trustworthy. Data provided by a centralized oracle presents security issues; for example, if the centralized oracle provider is compromised, then it could send erroneous data into the blockchain.

Solving the Blockchain Oracle Problem: Decentralized OraclesWhile developing a smart contract, you could use a decentralized oracle to provide data to it, or you could enable it to get data from multiple oracles and only trigger an event when the majority or all of the oracles offer the same input.In the case of larger bets, smart contracts can add multiple oracles to ensure that numerous sources or oracles validate the same outcome. For example; if two users place a bet in the form of a smart contract and the triggering event is the outcome of a basketball game, then we could write a smart contract that requires five oracles to participate, let’s say ESPN, NBC Sports, CNN Sports, BBC Sports, and Yahoo Sports. The smart contract can require all five oracles to signal the exact outcome before it can be executed.send data from the real world or another digital platform into a blockchain platform or smart contract. Most oracles, as of this writing, are input oracles.send information from a blockchain platform or smart contract to an external source. For example, if a smart contract is concluded, an output oracle can trigger an event in the real world – such as giving access to a website or a hotel room once payment has been received.These types of oracles enable users to build applications and services that are accessible and functional across different blockchain platforms.are currently only provided by Chainlink. Some computation is impractical to do on-chain because of legal, financial, or technical constraints.Rather than simply presenting the results of a query, compute-enabled oracles can perform intricate and complex calculations off-chain and then send the result to a blockchain platform.are suitable for specific situations. As their name suggests, they are oracles that are calibrated to work with a single smart contract.are people with specialized knowledge who can act as oracles; their reputation is the key factor that incentivizes them to present the correct information to smart contracts.While Chainlink is the biggest oracle provider as of this writing, the following protocols also provide various oracle-based services: Universal Market Access, Winklink, Band Protocol, iExec Cloud Platform, Tellor, DIA, Truebit, Terra, and Flare.There are numerous possible use cases for oracles. Below are the use cases with the highest levels of adoption as of this writing:Enterprises &can connect their off-chain operations to their on-chain logic through input and output oracles. This could allow them to automate their logic and perform complex operations using their digital and real-world assets.

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