A hash function is a mathematical algorithm that takes input data of any size and produces a fixed-size string of characters (hash). In blockchain, hash functions like SHA-256 are crucial because they:
Provide Deterministic Output: Same input always produces the same hash.
Are One-Way Functions: Computationally infeasible to reverse-engineer the input from the hash.
Have Avalanche Effect: Small changes in input create drastically different outputs.
Ensure Data Integrity: Any tampering with block data changes the hash, alerting the network.
Example:
Input: "Hello World"
SHA-256 Hash: a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b57b277d9ad9f146e
Input: "Hello World!"
SHA-256 Hash: 7f83b1657ff1fc53b92dc18148a1d65dfc2d4b1fa3d677284addd200126d9069
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