BlockchainIntermediate#Tech#Automation
Smart Contract
S
Definition
A program and its state deployed at a blockchain address, which runs its defined functions when transactions call it.
Source reviewed
- Ethereum.org: Introduction to smart contracts opens in a new tab
Supports: Defines smart contracts as blockchain programs and state, explains interactions, irreversibility, composability, and the oracle limitation.
- Ethereum.org: Smart contract security opens in a new tab
Supports: Documents that smart-contract security depends on design and implementation rather than automated execution alone.
Concept Diagram
Key Takeaways
1
A smart contract is onchain code and state, not automatically a legal agreement
2
It can only enforce its implemented logic and permissions on the relevant network
3
Oracles, upgrades, administrators, and transaction ordering can materially change an outcome
4
Verify address, code, permissions, approvals, and dependencies before relying on it
Practical Example
A lending protocol has an onchain liquidation function. Before depositing collateral, a user checks its deployed address, the oracle feeding prices, the liquidation parameters, upgrade authority, and whether a pause role can alter access. The word smart contract does not make those risks disappear.
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Related Terms
Blockchain
dApp (Decentralized Application)An application that combines a user interface with smart contracts or other decentralized-network components. Its interface, data services, wallet connection, and operations may still have centralized dependencies.
Blockchain
ERC-20An Ethereum token-interface standard for fungible token contracts. It specifies common methods and events, but it does not certify a token, its issuer, its economics, or its safety.
Blockchain
EVM (Ethereum Virtual Machine)Ethereum's execution environment: a deterministic virtual machine that executes smart-contract bytecode as part of Ethereum state transitions. EVM compatibility does not make contracts, addresses, assets, or deployments interchangeable across networks.
Blockchain
OracleA system that delivers external data or computation results to a smart contract. The contract can only act on the oracle interface and the protocol rules chosen for it; an oracle value is not a universal guarantee of truth, freshness, or safety.
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