Blockchain & Cryptocurrency Glossary

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Cross‑chain Oracle

1 min read
Pronunciation
[kraws-cheyn awr-uh-kl]
Analogy
Like a syndicated news service that publishes the same verified bulletin simultaneously in multiple newspapers worldwide.
Definition
An oracle specifically designed to deliver and synchronize external data across multiple blockchain networks, ensuring consistent and timely updates on each chain.
Key Points Intro
Cross‑chain oracles maintain data uniformity and freshness across networks.
Key Points

Multi‑network feeds: Single source of truth on all supported chains.

Threshold signing: Secures data with multi‑node attestations.

Latency monitoring: Ensures minimal delay divergence.

Fallback paths: Alternate relayers or feeds for resilience.

Example
An oracle publishes weather data to Ethereum, BSC, and Avalanche with less than 500 ms variance, used by cross‑chain insurance protocols.
Technical Deep Dive
Nodes fetch data from APIs, reach consensus via PBFT or threshold ECDSA, generate a signed data packet, and relay it via CCIP. Each chain’s on‑chain verifier contract checks signature and updates state.
Security Warning
Relayer collusion can feed false data to multiple chains; enforce node diversity and slashing for misreports.
Caveat
Maintaining tight synchronization across chains with different finality can be challenging.

Cross‑chain Oracle - Related Articles

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