Bip39 Tool But What on earth is it? A seed phrase is actually a mnemonic code consisting of twelve-24 words used to develop or Recuperate your copyright wallet. You may have read it called a backup phrase, recovery phrase, or mnemonic sentence. Use personal keys at brainwallet.org, but watch out https://www.youtube.com/channel/UCUpxfyTJ0fb78SQ55hU6OCw