Oracles¶
What is a Blockchain Oracle?¶
Oracles enable blockchains to access external data sources. Since blockchains operate as isolated networks, they cannot natively interact with external systems - this limitation is known as the "blockchain oracle problem." Oracles solves this by extracting data from external sources (like APIs, IoT devices, or other blockchains), validating it, and submitting it on-chain.
While simple oracle implementations may rely on a single trusted provider, more sophisticated solutions use decentralized networks where multiple providers stake assets and reach consensus on data validity. Typical applications include DeFi price feeds, weather data for insurance contracts, and cross-chain asset verification.
Oracle Implementations¶
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Acurast
Acurast is a decentralized, serverless cloud platform that uses a distributed network of mobile devices for oracle services, addressing centralized trust and data ownership issues. In the Polkadot ecosystem, it allows developers to define off-chain data and computation needs, which are processed by these devices acting as decentralized oracle nodes, delivering results to Substrate (Wasm) and EVM environments.
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DIA
DIA is a trustless oracle network providing verifiable price feeds for the Polkadot ecosystem. Data is aggregated from 100+ exchanges and validated by a network of independent feeders, making each feed fully auditable on-chain. The oracle stack covers 20,000+ assets across different asset classes: token price feeds including DOT/USD, RWAs such as tokenized treasuries, and yield-bearing tokens.
| Created: November 8, 2024