What Is Blockchain?

A blockchain is a distributed, immutable ledger technology that records transactions across a decentralised network of computers. Each transaction is cryptographically secured and permanently recorded in blocks, making the transaction history transparent and tamper-proof. In the context of decentralised finance, blockchains serve as the foundational infrastructure where smart contracts execute financial transactions, manage tokens and operate protocols without intermediaries. Popular blockchains for DeFi include Ethereum, BNB Smart Chain, Avalanche and various Layer 2 networks.

See also

• Smart contract

• EVM

• EVM-compatible

• Onchain

• Decentralised finance

• Token

• Wallet

• Protocol