Smart Contract

A smart contract is a means of programmatically exchanging value—currencies, assets, and rights—on the internet using blockchain technology.

Prior to smart contracts, value exchange required either meeting in person to exchange cash, or trusting a centralized authority (a bank, brokerage, or escrow company) to finalize transactions. Smart contracts allow code to exchange value with other code without any parties needing to trust each other, meet each other, or involve third-party intermediaries.

The impact has been sweeping. Smart contracts power decentralized finance (DeFi), enabling lending, borrowing, trading, and insurance without traditional financial institutions. They underpin NFTs, enabling verifiable digital ownership with programmable royalties. They enable DAOs—organizations governed by code rather than corporate boards.

Modern smart contract platforms have evolved well beyond Ethereum's original ERC-20 and ERC-721 standards. Layer-2 solutions have reduced transaction costs to fractions of a cent. Cross-chain protocols enable smart contracts on different blockchains to interact. And the tokenization of real-world assets—real estate, securities, commodities—is bringing trillions of dollars of traditional finance onto smart contract infrastructure.

Smart contracts have the potential to be as disruptive to finance, art, collecting, real estate, gaming, and other industries as decentralized web publishing was to information-intensive industries. The key innovation isn't the technology itself but the removal of intermediaries from value exchange—a pattern that compounds across every domain it touches.