J. Von Neumann
A pseudorandom number generator (PRNG), is an algorithm for generating a sequence of numbers whose properties approximate the properties of sequences of random numbers.
The PRNG-generated sequence is not truly random, because it is completely determined by an initial value, called the PRNG's seed.
Quantum random number generators use principles of quantum mechanics as a source of entropy.
Due to the laws of quantum physics, each measurement with identical initial conditions and the same measurement mode provides different values.
QRNs provide backward and forward unpredictability, that PRNs do not.
Ozone Chain uses laser-based quantum source to generate the randomness for its cryptography, hashing and digital signatures.