- To create a BIP39 mnemonic seed, the initial random binary value, together with its checksum, is split into 11 bits segments and each is then translated into seed words.
- Each 11 bits segment represents a decimal number between 0 and 2047 and serves as an index in BIP39 specific wordlist to convert the initial number into an easily readable form. That is why this list is made of 2048 words.
Initial entropy + checksum | Recovery seed length | Encryption level |
128 bits + 4 bits | 12 words | 128 bits |
160 bits + 5 bits | 15 words | 160 bits |
192 bits + 6 bits | 18 words | 192 bits |
224 bits + 7 bits | 21 words | 224 bits |
256 bits + 8 bits | 24 words | 256 bits |
More detailed information can be found on:
https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki
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