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// Hash data bc::extend_data(unencoded_address, hash); // Checksum is computed by hashing data, and adding 4 bytes from hash. bc::append_checksum(unencoded_address); // Finally we must encode the result in Bitcoin's base58 encoding assert(unencoded_address.size() == 25); const std::string address = bc::encode_base58(unencoded_address); std::cout << "Address: " << address << std::endl; return 0; } The code uses a pre-defined private key, so that it produces the same bitcoin address every time it is run: Example 4-2. Compiling and running the addr code # Compile the addr.cpp code $ g++ -o addr addr.cpp $(pkg-config --cflags --libs libbitcoin) # Run the addr executable $ ./addr Public key: 0202a406624211f2abbdc68da3df929f938c3399dd79fac1b51b0e4ad1d26a47aa Address: 1PRTTaJesdNovgne6Ehcdu1fpEdX7913CK Key Formats Private Key Formats The private key can be represented in a number of different formats, all of which cor‐ respond to the same 256-bit number. These formats include: Table 4-2. Private Key Representations (Encoding Formats) Type Prefix Description Hex None WIF 5 WIF-compressed K or L 64 hexadecimal digits Base58Check encoding: Base-58 with version prefix of 128 and 32-bit checksum As above, with added suffix 0x01 before encoding The private key we generated earlier can be represented as: Table 4-3. Example: Same Key, Different Formats Format Private Key Hex 1E99423A4ED27608A15A2616A2B0E9E52CED330AC530EDCC32C8FFC6A526AEDD WIF 5J3mBbAH58CpQ3Y5RNJpUKPE62SQ5tfcvU2JpbnkeyhfsYB1Jcn WIF-compressed KxFC1jmwwCoACiCAWZ3eXa96mBM6tb3TYzGmf6YwgdGWZgawvrtJ 76 | Chapter 4: Keys, Addresses, WalletsPDF Image | Mastering Bitcoin
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