Oracles & Cross-Chain Interoperability

How smart contracts get real-world data they can't natively access, and how assets and messages move between otherwise-isolated chains.

Read

50 min

Practice MCQs

25

Interview QA

25

Edition

v5

Editorial status

Reviewed

Relevant for

Blockchain Developer

Scope: Chainlink Data Feeds, Sequencer Uptime Feeds, VRF v2.5 and CCIP documentation; Uniswap v2 oracle design; IBC core and ICS-23 specifications; EIP-3668 reviewed 2026-09-07.