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Blockchain Meaning

A blockchain is a decentralized, immutable digital ledger that records transactions across a distributed network of computers. It is the foundational technology behind cryptocurrencies and many decentralized applications. Blockchain data is stored in blocks, which are linked together using cryptographic hashes.

Each block references the previous one, forming a chain that cannot be altered without rewriting the entire history-a process that is computationally infeasible on secure networks. One of blockchain’s defining features is decentralization. Instead of relying on a central authority, blockchains use consensus mechanisms to allow independent participants to agree on the state of the ledger.

This eliminates single points of failure and reduces the need for trust. Blockchains are also transparent. Public blockchains allow anyone to view transactions and verify activity, improving accountability.

At the same time, cryptographic techniques protect user identities and secure data integrity. There are several types of blockchains. Public blockchains are open to anyone and fully decentralized.

Private blockchains are controlled by a single organization. Permissioned blockchains combine elements of both, allowing restricted participation while leveraging blockchain technology.

Beyond cryptocurrencies, blockchains support applications in finance, supply chains, identity, governance, and data integrity. By enabling trustless coordination at a global scale, blockchain technology represents a fundamental shift in how digital systems are designed and operated.

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