They doesn’t exist in the time of satoshi so it’s a pointless fantasy. They are talking about: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki h

They doesn’t exist in the time of satoshi so it’s a pointless fantasy. They are talking about: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki https://github.com/bitcoin/bips/blob/master/bip-0039.mediawi... and https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki https://github.com/bitcoin/bips/blob/master/bip-0032.mediawi... A way of deriving new keys from a single seed value, which itself can be derived/“backed up” by a set of words. The words are equivalent to the wallet balance.