Bitcoins' blockchain is using the SHA-256 hash function. What method does it use to convert an arbitrary-length input to a fixed length before applying the hashing. Answers: It iteratively compresses...

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Extracted text: Bitcoins' blockchain is using the SHA-256 hash function. What method does it use to convert an arbitrary-length input to a fixed length before applying the hashing. Answers: It iteratively compresses the input. It applies a discrete fourier transform on the input. It truncates the input to reach the desired length. It removes the least significant bits of the input. It's padding the input with zeros to reach the desired length.