Blockchain & Cryptocurrency Glossary

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Oracle Node

Pronunciation
[awr-uh-kl nohd]
Analogy
Like a weather station that collects sensor readings and telegraphs them to a central database.
Definition
A dedicated server or process that fetches external data, generates attestations, and submits signed updates to oracle smart contracts on the blockchain.
Key Points Intro
Oracle nodes operate the off‑chain infrastructure for data retrieval, signing, and submission.
Key Points

Data fetcher: Connects to APIs, databases, or sensors.

Signer: Holds private key to sign attestations.

Submitter: Crafts and sends transactions to blockchain.

Monitor: Reports health and performance metrics.

Example
A Chainlink node runs Docker containers for external adapters, the core node, and job specs to periodically post price data to Ethereum.
Technical Deep Dive
Node runs `chainlink` core, loads `JobSpec` definitions for HTTPGet tasks, uses encrypted keystore for private key, and connects via WebSocket to Ethereum JSON‑RPC endpoint for transaction submission.
Security Warning
Node key compromise allows false attestations; use HSM or secure enclave.
Caveat
Single node downtime can impact feeds; run redundant nodes.
Related Terms
Oracle Adapter
Oracle Attestation
Oracle Collateralization
Oracle Monitoring Dashboard
Oracle SLA Enforcement

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