Hash

A hash is a unique alphanumeric value generated by a hashing function that converts input data of any length into a fixed-length string. Hashing is a fundamental concept in blockchain technology, ensuring security, data integrity, and efficient transaction processing. Common hashing algorithms include SHA-256 (used in Bitcoin) and Keccak-256 (used in Ethereum).

In a blockchain, each block contains the hash of the previous block, forming an unbreakable chain of data. Even the slightest change in a transaction results in a completely different hash, making it nearly impossible to alter past records. Hashing is also used in wallet addresses, digital signatures, and cryptographic mechanisms within decentralized systems.