Bip39 Docs To Create a seed phrase in this manner, you'll need a calculator which has a RANDOM purpose (for building entropy). Learn more about generating a seed phrase utilizing an offline calculator in this article. BIP39 specifies a list of 2048 words from which the mnemonic phrase is picked. https://www.youtube.com/channel/UCUpxfyTJ0fb78SQ55hU6OCw