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Blockchain

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A blockchain is a decentralized, distributed, and cryptographically immutable digital ledger. Transactions are bundled into cryptographic blocks linked together linearly via SHA-256 hashes. Consensus mechanisms like Proof of Stake ensure network agreement without a central intermediary.

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Citations & Sources

"Blockchains are tamper-evident and tamper-resistant digital ledgers implemented in a distributed fashion without a central repository."

NIST (National Institute of Standards and Technology)