What is an Oracle?
An oracle is a mechanism that transfers information from outside the blockchain or different systems into a format that smart contracts can utilize.
What is an oracle?
An oracle is a structure that provides information from outside the blockchain or from other systems in a format that smart contracts can use. In Turkish, it is sometimes called “veri kahini” (data oracle); however, it does not predict the future. It enables the transfer of data such as prices, weather, or the outcome of an event into the contract.
A smart contract cannot simply open a random page on the internet and automatically obtain the same reliable result for all nodes. Participants in the network must rely on the same data. An oracle establishes the connection between external world information and on-chain rules.
A lending example
Imagine you deposit ETH as collateral into a DeFi application and borrow stablecoins. The application needs price data to determine the dollar value of the collateral. If the price drops significantly, a portion of your position may be liquidated. If the oracle sends an incorrect or delayed price, this decision could be made at the wrong time.
Therefore, it is important to know who the data source is, how many markets the price is aggregated from, how frequently it is refreshed, and what actions are taken during extraordinary fluctuations. Utilizing multiple sources can reduce risk, but it does not eliminate all possibilities of error on its own.
What does it mean to buy an oracle token?
The token of an oracle project can be used for payments, incentives, or security mechanisms. However, purchasing this token does not mean obtaining a personal guarantee regarding the accuracy of the data or becoming an automatic partner in the project’s revenue. The rights associated with the token should be examined separately.
Oracle risk is not limited to direct attacks. Issues can also arise from pulling prices from a low-liquidity market, data delays, or the application using the wrong data pair. Just because a protocol’s code has been audited does not mean its external data will always be correct. Understanding the criteria on which the contract bases its decisions helps in identifying the source of risk.