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Blockchain-as-a-Service comprises providing blockchain infrastructure for a customer, for a fee. The client pays the provider to set up and maintain blockchain-connected nodes and handle a complex backend. There is another working business model related to distributed ledgers where you are paying not for blockchain as it is, but for the services, it provides to the customer. This is exactly how <a href="http://remme.io" target="_blank">REMChain</a> is built. As a decentralized application developer or private company representative, you don’t need to pay for blockchain maintenance, but for the necessary quantity of blockchain-backed PKI certificates.