Wallet Mnemonic Seed Phrase (BIP-39)
BIP-0039 is a standard for mnemonic codes, or a way to encode a seed phrase for a wallet. The standard includes a list of 2048 words, which are used to encode the seed phrase.
Most of the wallets use BIP-0039 to generate a seed phrase, which is a list of 12, 18, or 24 words. The seed phrase is used to generate the private keys for the wallet.
First 4 digits of each seed word
The first 4 digits of each seed word are unique, and can be used to identify the word. This is useful for error checking, and for selecting the correct word from a list of similar words.
TIP Since the first 4 digits of each word are unique in the 2048 word list, we can simply remember the first 4 digits of each word of our seed phrase.
When we need to recover our wallet, we can simply look up the first 4 digits of each word in the list, and select the correct word.