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Author: Admin | 2025-04-28
Hashing algorithm into it. For the SHA256, we are going to use the SHA256 function from OpenSSL. First, let create a method to compute the double hash SHA256(SHA256(block header)):We can now test our code and compare it with what it is the real Bitcoin network. If we search for example for the 125552 Bitcoin block in a Bitcoin block-explorer we will find:version: 0x00000001 (little-endian)previous_hash: 81cd02ab7e569e8bcd9317e2fe99f2de44d49ab2b8851ba4a308000000000000 (big-endian)merkle_root: e320b6c2fffc8d750423db8b1eb942ae710e951ed797f7affc8892b0f1fc122b (big-endian)timestamp: 0x4dd7f5c7 (little-endian)difficulty: 0x1a44b9f2 (little-endian)nonce: 0x9546a142 (little-endian)Finally creating a constructor for the class, using the previous values for instantiating an object of that class:If we compile the code with GCC, and execute we get the result: “1dbd981fe6985776b644b173a4d0385ddc1aa2a829688d1e0000000000000000” (little-endian format). We can see that that coincides with the block-hash of the 125552 block written in big-endian format as “00000000000000001e8d6829a8a21adc5d38d0a473b144b6765798e61f98bd1d”.Please check if you can improve the code and send me any comment that would help me better explain the hashing of the block header or any improvement on the source code. In the following article, I will cover Proof-of-Work, the consensus algorithms that provide Bitcoin the resistance against the Sybil attack.
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