i have backed up my nsec on paper using it... you can at least use this tool to back it up even if the guardians of the nips don't approve the encoding
Discussion
the algorithm is very simple... it turns your nsec into a giant 256 bit number, and then divides it over and over again by 2048, and the values that come out refer to a word in the BIP-39 word list and that's it... there is one extra 8 bits at the front, and i made it so the first (biggest, on the left) bit is always 1 so no matter what the first one returns something other than 0 because 0 is "abandon" and i don't like that word
