Anyone who is familiar with cryptocurrencies knows that if you want to really hold assets, you must transfer the assets to your own wallet, and to keep the wallet for a long time, you need a mnemonic board. The purpose of the mnemonic board is to save a piece of text that representing your key on a refractory and corrosion-resistant metal plate by means of punching, engraving, etc., to achieve the purpose of long-term preservation. In this article, I will introduce a new method of making a mn...