Smart Contracts and Decentralized Finance — Issue #2

Smart Contracts: The Building Blocks of Web3

Smart contracts are self-executing programs stored on a blockchain. They automatically enforce rules and execute actions when predefined conditions are met — no intermediary required.

How Smart Contracts Work

A smart contract is code deployed to a blockchain network. When a user sends a transaction to the contract, every node executes the code and reaches consensus on the result. This makes smart contracts:

• Autonomous: They run without human intervention
• Transparent: The code is publicly visible on-chain
• Immutable: Once deployed, the logic cannot be changed
• Trustless: No party needs to trust another — the code enforces the rules

DeFi: Finance Without Banks

Decentralized Finance (DeFi) uses smart contracts to recreate traditional financial services — lending, borrowing, trading, insurance — without banks or brokers. Users interact directly with smart contracts, earning yield, borrowing against collateral, or swapping tokens permissionlessly.

Total Value Locked (TVL) in DeFi protocols represents the capital deposited in these smart contracts — a key metric for measuring DeFi adoption.

New in the Library

• Understanding Smart Contracts: The Building Blocks of Web3
• Decentralized Finance (DeFi): A Comprehensive Guide
• What Is Cryptocurrency? Understanding Digital Money

Reader Question of the Week

"Are smart contracts really safe if they can't be changed?"

Great question! Immutability is a double-edged sword. While it ensures trust, bugs in smart contracts cannot be patched directly. The industry addresses this through rigorous auditing, formal verification, and upgradeable proxy patterns. Always do your research before interacting with DeFi protocols.

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