Oracles Power Blockchain Security
Smart contracts are powerful tools that enable secure and transparent transactions on blockchain networks. However, they have one major limitation - they are 'blind' to external data.
To overcome this limitation, blockchain oracles were developed as a bridge between the blockchain and the outside world. Oracles provide external data to smart contracts, enabling them to make informed decisions based on real-world events.
Chainlink dominates the oracle market with approximately 75% of total value secured across decentralized finance protocols. Its decentralized oracle network aggregates data from multiple independent node operators, reducing single points of failure and increasing security.
However, oracle manipulation has been responsible for some of the largest exploits in DeFi history, including flash loan attacks that target protocols relying on a single on-chain price source. To mitigate this risk, decentralized oracle networks like Chainlink's are becoming increasingly popular.