Generate SHA-256

What's SHA ?

Firstly, from the English “Secure Hash Algorithm”, is a cryptographic function used as the basis of the Bitcoin work system. This function takes a random-sized input and converts it to a 256-bit fixed-size output. Hash functions are special because they are unidirectional, that is, they cannot produce the input from the output, but an output when they receive an input. In addition, the hash is calculated by the miners so that a transaction can be added to the blockchain, functioning as a kind of link between the blocks.