bitcoinbook/code/satoshi-words.cpp

/*
  Display the genesis block message by Satoshi.
*/
#include <iostream>
#include <bitcoin/bitcoin.hpp>

int main()
{
    // Create genesis block.
    bc::chain::block block = bc::chain::block::genesis_mainnet();
    // Genesis block contains a single coinbase transaction.
    assert(block.transactions().size() == 1);
    // Get first transaction in block (coinbase).
    const bc::chain::transaction& coinbase_tx = block.transactions()[0];
    // Coinbase tx has a single input.
    assert(coinbase_tx.inputs().size() == 1);
    const bc::chain::input& coinbase_input = coinbase_tx.inputs()[0];
    // Convert the input script to its raw format.
    const auto prefix = false;
    const bc::data_chunk& raw_message = coinbase_input.script().to_data(prefix);
    // Convert this to a std::string.
    std::string message(raw_message.begin(), raw_message.end());
    // Display the genesis block message.
    std::cout << message << std::endl;
    return 0;
}