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FollowingUnderstand the blockchain oracle
The blockchain oracle is a third-party service that provides external information for smart contracts. They serve as a bridge between blockchain and the outside world. Blockchain and smart contracts cannot access offline data (data outside the network). However, for many contractual agreements, relevant external information is required to implement the agreement.
This is where blockchain oracles come into play because they provide a link between off-chain and on-chain data. Oracles are important in the blockchain ecosystem because they broaden the scope of smart contracts. Without blockchain oracles, smart contracts would have very limited use because they could only access data within the network.
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How a blockchain oracle works
The blockchain oracle itself is not a data source, but a layer that queries, verifies, and validates external data sources, and then relays that information. The data transmitted by the oracle comes in many forms-price information, the successful completion of a transaction, or temperature measured by sensors.
To call data from the outside world, a smart contract must be called and network resources must be spent. Some oracles can not only forward information to smart contracts, but also send it back to external sources.
Types of blockchain oracle
There are many types of blockchain oracles, and each type is designed to serve a specific purpose. Software oracle machines aggregate data available on the Internet and provide it to smart contracts, such as price data for digital assets. Hardware oracle refers to data from the physical world that can only be obtained through hardware such as sensors or scanners. The human oracle involves a person providing data based on real-world events.
The oracle problem
The blockchain oracle problem highlights a key limitation of smart contracts, which is that they cannot connect to data and systems outside of the native blockchain environment. This limitation is due to the determinism of blockchain architecture, where every node in the network must obtain the same results given the same input. This deterministic architecture is important for nodes to reach consensus, which is a fundamental aspect of blockchain functionality.
Blockchain oracle use cases
There are multiple use cases for blockchain oracle. They are used in decentralized finance (DeFi) to provide current price data for digital assets. They are also used for betting and forecasting markets, games, non-fungible tokens (NFT) and insurance. In each case, the oracle provides an important link between blockchain and real-world data, allowing smart contracts to operate effectively.
