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any compatible wallet application. Mnemonic code words make it easier for users to back up wallets, as they are easy to read and correctly transcribe, as compared to a random sequence of numbers. Mnemonic codes are defined in Bitcoin Improvement Proposal 39 (see [bip0039]), currently in Draft status. Note that BIP0039 is a draft proposal and not a standard. Specifically, there is a different standard, with a different set of words used by the Elec‐ trum wallet and predating BIP0039. BIP0039 is used by the Trezor wallet and a few other wallets but is incompatible with Electrum’s implementation. BIP0039 defines the creation of a mnemonic code and seed as a follows: 1. Create a random sequence (entropy) of 128 to 256 bits 2. Create a checksum of the random sequence by taking the first few bits of its SHA256 hash 3. Add the checksum to the end of the random sequence 4. Divide the sequence into sections of 11 bits, using those to index a dictionary of 2048 pre-defined words 5. Produce 12-24 words representing the mnemonic code Table 4-5. Mnemonic Codes: Entropy and Word Length Entropy (bits) 128 160 192 224 256 Checksum (bits) 4 5 6 7 8 Entropy+Checksum Word Length 132 12 165 15 198 18 231 21 264 24 The mnemonic code represents 128 to 256 bits which are used to derive a longer (512 bit) seed through the use of the key-stretching function PBKDF2. The resulting seed is used to create a deterministic wallet and all of its derived keys. Here are some examples of mnemonic codes and the seeds they produce: Table 4-6. 128-bit entropy mnemonic code and resulting seed entropy input (128 bits) mnemonic (12 words) seed (512 bits) 0c1e24e5917779d297e14d45f14e1a1a army van defense carry jealous true garbage claim echo media make crunch 3338a6d2ee71c7f28eb5b882159634cd46a898463e9d2d0980f8e80dfbba5b0fa0291e5fb88\ 8a599b44b93187be6ee3ab5fd3ead7dd646341b2cdb8d08d13bf7 Wallets | 87PDF Image | Mastering Bitcoin
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