Definition ∞ On-Chain Oracle Services are decentralized mechanisms that securely supply external, real-world data to smart contracts operating on a blockchain. These services enable smart contracts to execute based on information not natively stored on the blockchain, ensuring data integrity through cryptographic verification. They bridge the gap between off-chain data and on-chain logic.
Context ∞ On-chain oracle services are indispensable for the functionality of numerous decentralized applications, especially within DeFi, where smart contracts require accurate price feeds, event outcomes, or other external data. The reliability, security, and decentralization of these oracles remain a central discussion point in blockchain development. News frequently covers new oracle solutions and their impact on decentralized ecosystems.