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Cloud radio access network (C-RAN) interconnects thousands of terminal devices to support the services of Internet of Things (IoT) in 5G area. However, centralized access authentication of each terminal has been performed in mobile core network which causes an extremely high operating and capital expenditure of network. Traditional C-RAN cannot provide an authentic mechanism to guarantee the security of services and creditability of device and resource accessing with low network cost. We first propose a blockchain-based trusted authentication (BTA) architecture for 5G with blockchain-based anonymous access (BAA) scheme in cloud radio over fiber network. The feasibility and efficiency are verified on enhanced SDN testbed to enable blockchain as a service.