A public blockchain is a decentralized and open blockchain network where anyone can participate, validate transactions, and access the entire blockchain ledger. Public blockchains like Bitcoin and Ethereum are transparent, secure, and resistant to censorship, making them suitable for cryptocurrencies, decentralized applications (DApps), and smart contracts. They are supported by a consensus mechanism such as Proof of Work (PoW) or Proof of Stake (PoS) and operate without central authority. Public blockchains ensure trustless and permissionless interactions, offering high security and immutability for all participants.
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