public virtual double TargetToDifficulty(UInt256 target)
{
// implementation is equivalent of HighestTarget / target
// perform the division
UInt256 remainder;
var result = UInt256.DivRem(HighestTarget, target, out remainder);
// count the leading zeros in the highest target, use this to determine significant digits in the division
var insignificant = HighestTarget.ToByteArray().Reverse().TakeWhile(x => x == 0).Count();
// take only as many significant digits as can fit into a double (8 bytes) to calculate the fractional value
var remainderDouble = (double)(Bits.ToUInt64((remainder >> (8 * insignificant)).ToByteArray().Take(8).ToArray()));
var divisorDouble = (double)(Bits.ToUInt64((target >> (8 * insignificant)).ToByteArray().Take(8).ToArray()));
// return the difficulty whole value plus the fractional value
return((double)result + (remainderDouble / divisorDouble));
}