Bip39 Seed. For that reason, to back up the received bitcoin, you must transcribe all the non-public keys generated once in a while. In reality, this solution is very awkward. Seed phrase generation: These wallets can make a BIP39 mnemonic phrase for you, usually exhibiting it on their protected display. https://sparedirectory.com/listings600363/bip39-word-list-numbers-https-linktr-ee-bip39-not-known-details-about-bip39-online