bm.go

			// e = 10^21
			e := big.NewInt(0).Exp(big.NewInt(10), big.NewInt(21), big.NewInt(0))
			d := new(big.Rat)
			d.SetInt(block.Difficulty)
			c := new(big.Rat)
			c.SetFloat64(0.5)
			// d = diff / 0.5
			d.Quo(d, c)
			// base = floor(d)
			base.Div(d.Num(), d.Denom())

			x := new(big.Int)
			x.Div(e, base)

			// x = floor(10^21 / floor(diff^0.5))