Authenticating antiques; Authenticating banknotes; Authenticating coins; Authenticating diamonds; Authenticating gemstones; Authenticating jewelry; Authenticating oil paintings; Authenticating semi-precious gemstones; Authenticating works of art; Authentication in the field of art, blockchain; Authentication of data in the field of art and blockchain design using blockchain technology; Authentication of diamonds; Authentication, issuance and validation of digital certificates; Computer security services in the nature of providing authentication, issuance, validation and revocation of digital certificates; Design and implementation of software and technology solutions for the purpose of product and document authentication and tracking, and brand monitoring and protection, to protect against counterfeiting, tampering, and diversion, and to ensure the integrity of genuine products and documents; Design, development, and implementation of software for NFT, Blockchain, counting; Electronic document and e-mail authentication and time-stamping services using the time stamp of a national post office; Electronic document and e-mail authentication services; Electronic signature verification services using technology to authenticate user identity; Providing user authentication services using biometric hardware and software technology for e-commerce transactions; Providing user authentication services using biometric hardware and software technology for blockchain, NFT; Providing user authentication services using blockchain-based software technology for cryptocurrency transactions; Providing user authentication services using single sign-on technology for online software applications; Providing user authentication services using NFT, blockchain for e-commerce transactions; User authentication services using blockchain technology for goods, apparel, fashion, stickers; User authentication services using single sign-on technology for online software applications