What is the role of a hash function in blockchain, and how is it implemented in Java?
A hash function is used to generate a block's identifier in the blockchain. In Java, you can implement it by using random numbers and basic arithmetic.
Thatâ€™s incorrect. Hash functions generate fixed-size outputs based on the input, and the process is not based on randomness or arithmetic.
Can you explain how `SHA-256` generates a hash and why randomness is not involved?