Mastering Bitcoin

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Mastering Bitcoin ( mastering-bitcoin )

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addresses. Vanity searches on GPU systems are many orders of magnitude faster than on a general-purpose CPU. Another way to find a vanity address is to outsource the work to a pool of vanity-miners, such as the pool at vanitypool.appspot.com. A pool is a service that allows those with GPU hardware to earn bitcoin searching for vanity addresses for others. For a small payment (0.01 bitcoin or approximately $5 when this was written), Eugenia can out‐ source the search for a 7-character pattern vanity address and get results in a few hours instead of having to run a CPU search for months. Generating a vanity address is a brute-force exercise: try a random key, check the re‐ sulting address to see if it matches the desired pattern, repeat until successful. Here’s an example of a “vanity miner”, a program designed to find vanity addresses, written in C ++. The example uses the libbitcoin library, which we introduced in “Alternative clients, libraries and toolkits” on page 56. Example 4-7. Vanity Address Miner #include // The string we are searching for const std::string search = "1kid"; // Generate a random secret key. A random 32 bytes. bc::ec_secret random_secret(std::default_random_engine& engine); // Extract the Bitcoin address from an EC secret. std::string bitcoin_address(const bc::ec_secret& secret); // Case insensitive comparison with the search string. bool match_found(const std::string& address); int main() { std::random_device random; std::default_random_engine engine(random()); // Loop continuously... while (true) { // Generate a random secret. bc::ec_secret secret = random_secret(engine); // Get the address. std::string address = bitcoin_address(secret); // Does it match our search string? (1kid) if (match_found(address)) { // Success! std::cout << "Found vanity address! " << address << std::endl; std::cout << "Secret: " << bc::encode_hex(secret) << std::endl; return 0; } } // Should never reach here! 102 | Chapter 4: Keys, Addresses, Wallets

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