The participating nodes in KBF chain can be hotel operators, hotel suppliers, residents, various organizations in the alliance chain to form an interest related alliance to jointly maintain the healthy operation of KBF. At the same time, although the personal information of the guests and the financial situation of the hotel are on the chain, part of the information is limited to some people, which ensures the top secret of the hotel operation process. In the KBF chain, some nodes share the hotel operation status, etc. users can query the hotel dynamic, the latest service content, price, personal check-in and other details on the chain, and the data can not be tampered with; users can also use the KBF card in mrco's hotels, catering, entertainment, education and other fields.