Bip39. These words are then utilised to make a seed, and that is used for generating prolonged keys inside of a hierarchical deterministic wallet. From the online video under it is possible to observe the seed stamping approach exactly where I punch many of the 24 words onto 4mm thick https://finance-yahoo81470.sunderwiki.com/1105325/the_anatomy_of_the_bip39_phrase_entropy_words_and_phrases_and_protection