O2&B is a company that designs and manufactures water filtration systems. It has fully automatic technology, process monitoring technology, tailor-made community water supply installation technology, MCDI purification technology, CDI community technology, and is specialized in small village water supply installation worldwide. . The PURI/02 blockchain system established by O2&B has the core value of 1:1 value exchange. Cryptocurrencies and coins of the blockchain received by individuals will be exchanged in the international water market, including the process from the final system to large factories will be controlled by the same blockchain.