What is the exact value of a quantum of entropy?

A quantum of mass must be very small. It can only have one degree of freedom. A quantum of mass must have a nonzero temperature. It cannot have a temperature lower than the temperature of our universe as a black hole, containing all the mass of our universe. Every gravitationally closed horizon has a mass, radius, and temperature. In quantum terms each quantum bit of information must be identical, if we are to measure black holes in quantum terms. Each quantum bit of information must have the same unit of entropy. I will prove every black hole knows this value precisely because they are all quantum systems at the same scale. Using dimensional analysis and combining the Schwarzschild metric with Hawking's horizon temperature we can calculate a quantum of entropy, knowing it's mass, energy, temperature, and wavelength. It's so easy, it's embarrassing, even though it took me 42 years to prove it.