Mastering Bitcoin

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Mastering Bitcoin ( mastering-bitcoin )

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const bc::data_chunk& raw_message = save_script(coinbase_input.script); // Convert this to an std::string. std::string message; message.resize(raw_message.size()); std::copy(raw_message.begin(), raw_message.end(), message.begin()); // Display the genesis block message. std::cout << message << std::endl; return 0; } We compile the code with the GNU C++ compiler and run the resulting executable: Example 8-7. Compiling and running the satoshi-words example code $ # Compile the code $ g++ -o satoshi-words satoshi-words.cpp $(pkg-config --cflags --libs libbitcoin) $ # Run the executable $ ./satoshi-words ^D��^A^DEThe Times 03/Jan/2009 Chancellor on brink of second bailout for banks Constructing the Block Header To construct the block header, the mining node needs to fill in six fields: Table 8-3. The structure of the block header Size 4 bytes 32 bytes 32 bytes 4 bytes 4 bytes 4 bytes Field Version Previous Block Hash Merkle Root Timestamp Difficulty Target Nonce Description A version number to track software/protocol upgrades A reference to the hash of the previous (parent) block in the chain A hash of the root of the Merkle-Tree of this block’s transactions The approximate creation time of this block (seconds from Unix Epoch) The Proof-of-Work algorithm difficulty target for this block A counter used for the Proof-of-Work algorithm At the time block 277,316 was mined, the version number describing the block structure is version “2”, which is encoded in little-endian format in 4 bytes as 0x02000000. Next, the mining node needs to add the “Previous Block Hash”. That is the hash of the block header of block 277,315, the previous block received from the network, which Jing’s node has accepted and selected as the parent of the candidate block 277,316. The block header hash for block 277,315 is 0000000000000002a7bbd25a417c0374cc55261021e8a9ca74442b01284f0569. The next step is to summarize all the transactions with a Merkle Tree, in order to add the Merkle Root to the block header. The generation transaction is listed as the first transaction in the block. Then, 418 more transactions are added after it, for a total of 419 transactions in the block. As we saw in the “Merkle Trees” on page 170, there must Constructing the Block Header | 191

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