Bip39 Mnemonic. For that reason, to back again up the received bitcoin, you would have to transcribe each of the non-public keys generated once in a while. In reality, this Alternative is incredibly not comfortable. For words that have only 3 letters, there isn't a 4th letter. One example is https://bentdirectory.com/listings13079067/bip39-npm-https-linktr-ee-bip39-getting-my-bip39-standalone-to-work