You wrote. "The basis for the development of our smart contract lay openzeppelin.orglibraries, which provide the standard of reliability and security of executable code throughout the world. VR-token is a token on the Ethereum platform, created according to the ERC-20 standard with limited volume.". But, now the tokens are already being released on the ERC 223 or ERC 721 protocol. They are faster and safer and backward compatible with ERC 20.