With the success of blockchains for providing a high security platform for distributed systems, new challenges are presented in relation with the deployment of this technology for IoT applications with time constraints. In this paper, we present a new lightweight blockchain platform that is scalable to hold a large number of transactions and with acceptable latency times. We have designed a new rapid consensus algorithm that improves PBFT to apply it in a random cluster with a small number of Miners. This will enable multiple consensus on different clusters to be executed in parallel to reduce the complexity of PBFT, have acceptable latency and increase the scalability. The evaluations carried out on our proposal by comparing it with other pipeline PBFT improvement approaches, show that our approach has better latency that is still accessible even with a high load of transactions.