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But if we set the challenge vice versa knowing only the output we will have a number of different variants of inputs: 9+1, 8+2, 7+3, 6+4, 5+5, etc. The challenge in a mathematical puzzle is that miner needs to find such input that will satisfy the specific output. Note: The specific output is a digital value of a block header’s hash - an identifier of a block that has to start with a certain number of zeros.