Creating an online community for enabling registered users in the field of blockchain technology to create virtual communities and join in social networking services; creating and managing of website for enabling registered users in the field of blockchain technology to create virtual communities and join in social networking services; creating an online community for enabling registered users in the field of blockchain technology to participate in discussions and get feedback from colleagues; database certification in the field of art works, financial transactions, medical records using blockchain technology; providing temporary use of non-downloadable software for enabling online community members to receive or access non-fungible token(NFT); providing temporary use of non-downloadable software for enabling online community members to consumptions and deals of non-fungible token(NFT); design and development of virtual reality software; development of game software; providing access to platforms for issuance and transaction of non-fungible token(NFT) based on blockchain; providing access to platforms for issuance and transaction of digital tokens about ownership and right of digital contents based on blockchain; development of software for blockchain electronic tokens or virtual currency; certification of database about virtual currency and non-fungible token(NFT) through blockchain; development of computer software for big data processing; software as a service, namely, in the field of blockchain technology; providing paas (platform as a service), namely, in the field of blockchain technology; designing and providing online platform to facilitate transactions of virtual currency and non-fungible token(NFT); hosting platforms on the Internet for delivery of multimedia content; development of computer platforms; cloud computing services, namely, in the field of blockchain technology