Block Chain - Cryptographic Hashing

Cryptographic hashing is the process of converting data into a fixed-length string of characters using a mathematical algorithm.

In blockchain, hashing ensures data integrity. Even a small change in input data produces a completely different hash output.

Each block has its own hash, and it also stores the hash of the previous block. This creates a secure link between blocks.

Hashing makes blockchain tamper-resistant. If someone tries to alter transaction data, the hash changes and the block becomes invalid.

Common hashing algorithms used in blockchain include SHA-256. These algorithms are designed to be fast but extremely difficult to reverse.

Hashing also supports authentication by verifying that data has not been altered during transmission.

Because of cryptographic hashing, blockchain systems are highly secure and reliable.