A hash is a cryptographic function that secures blockchain transactions, ensuring data integrity and immutability. The SHA-256 hashing algorithm underpins Bitcoin’s security, while Ethereum utilizes Keccak-256 for smart contract execution. Hashing enables block validation, digital signatures, and secure wallet encryption in blockchain systems. Innovations in zero-knowledge proofs (ZKPs), homomorphic encryption, and post-quantum cryptography enhance blockchain security. Users rely on hash rate metrics, cryptographic randomness, and Merkle trees for ensuring trustless interactions within decentralized networks.
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