nice work, unfortunately it is doomed to DOA . reason : Waaaay to slow retarget. initial dump , huge hash power swich + auto swiching pools + hashpower renting = infinite years waiting for retarget. why do You try to reinvent the wheel? simply use every-block,exponentialy-weighted moving-average and it will work. or at least something simmiliar used in tens of altcoins. that can work below 1% of global sha256 hashpower .what is here proposed will die very quickly, instantenously to be precise.