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# Blockchain Oracles: Bridging On-Chain and Off-Chain Worlds ## What Are Blockchain Oracles? **Blockchain oracles** are middleware services that connect blockchains to external off-chain systems and data sources. They enable smart contracts to execute based on real-world inputs—such as asset prices, weather data, sports results, or IoT sensor readings—that exist outside the blockchain's native environment. Oracles solve the fundamental **"oracle problem"**: blockchains are intentionally isola

**Coin vs. Token – What’s the Difference?** | Aspect | Coin | Token | |--------|------|-------| | **Primary Purpose** | Acts as a native currency of its own blockchain (e.g., Bitcoin, Ethereum). | Represents an asset or utility that runs **on top of** an existing blockchain (e.g., ERC‑20 tokens on Ethereum). | | **Underlying Blockchain** | Has its own independent network and consensus mechanism. | Relies on the infrastructure of another blockchain; no separate network needed. | | **Creation** |