Blockchain Oracles Explained: Chainlink, Pyth Network, and the Oracle Problem
How smart contracts securely fetch external off-chain market prices without compromising cryptographic decentralization.
Why blockchains cannot query HTTPS APIs natively, how decentralized oracle networks aggregate off-chain exchange data, and how push vs pull oracle architectures compare.
1. The Inherent Blockchain Oracle Problem
Deterministic blockchains cannot initiate external HTTP network calls because every validator in the world must execute the exact same state transition and arrive at identical block state.
Oracles bridge this gap by cryptographically signing external price data off-chain and posting it on-chain through dedicated data feed aggregators.
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