A blockchain is composed of a chain of blocks, each containing a set of transactions that are cryptographically linked. The structure ensures immutability, transparency, and security, making blockchain ideal for finance, supply chains, and decentralized identity systems. Different blockchains, such as Ethereum, Bitcoin, and Binance Smart Chain, use varying consensus mechanisms to validate and append new blocks. The introduction of sidechains, rollups, and sharded chains enhances scalability while preserving decentralization. Developers leverage cross-chain interoperability solutions like Polkadot, Cosmos, and bridges to connect different ecosystems.
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