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If a bitcoin wallet is able to implement compressed public keys, then it will use those in all transactions. The private keys in the wallet will be used to derive the public key points on the curve, which will be compressed. The compressed public keys will be used to produce bitcoin addresses and those will be used in transactions. When exporting pri‐ vate keys from a new wallet that implements compressed public keys, the Wallet Import Format is modified, with the addition of a one-byte suffix +01+to the private key. The resulting base58check encoded private key is called a “Compressed WIF” and starts with the letter K or L, instead of starting with “5” as is the case with WIF encoded (non- compressed) keys from older wallets. Here’s the same key, encoded in WIF and WIF-compressed formats Table 4-4. Example: Same Key, Different Formats Format Hex WIF Hex-compressed WIF-compressed Private Key 1E99423A4ED27608A15A2616A2B0E9E52CED330AC530EDCC32C8FFC6A526AEDD 5J3mBbAH58CpQ3Y5RNJpUKPE62SQ5tfcvU2JpbnkeyhfsYB1Jcn 1E99423A4ED27608A15A2616A2B0E9E52CED330AC530EDCC32C8FFC6A526AEDD_01_ KxFC1jmwwCoACiCAWZ3eXa96mBM6tb3TYzGmf6YwgdGWZgawvrtJ “Compressed private keys” is a misnomer! They are not com‐ pressed, rather the WIF-compressed format signifies that they should only be used to derive compressed public keys and their correspond‐ ing bitcoin addresses. Ironically, a “WIF-compressed” encoded pri‐ vate key is one byte longer because it has the added 01 suffix to dis‐ tinguish it from an “uncompressed” one. Implementing Keys and Addresses in Python The most comprehensive bitcoin library in Python is “pybitcointools"by Vitalik Buterin (https://github.com/vbuterin/pybitcointools). In the following code example, we use the pybitcointools library (imported as “bitcoin”) to generate and display keys and addresses in various formats: Example 4-3. Key and Address generation and formatting with the pybitcointools li‐ brary import bitcoin # Generate a random private key valid_private_key = False while not valid_private_key: private_key = bitcoin.random_key() decoded_private_key = bitcoin.decode_privkey(private_key, 'hex') valid_private_key = 0 < decoded_private_key < bitcoin.N Implementing Keys and Addresses in Python | 81PDF Image | Mastering Bitcoin
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