GAMBLICA is an international online casino based on the integration of innovative IT solutions in online gambling and blockchain technology. The main advantage of our casino is the transparency of random number generation system, which can assure players of the fairness of a game's outcome. A random number is calculated by the RSA cryptographic algorithm, based on one-way hash functions. To generate a random number, several parameters are used as input data for the function. This multi-factor model is much more reliable than single-factor models used in similar projects, due to the increased security of the protocol against being compromised by the third party.