Development of Consensus Trust-based Mechanism with Expulsion of Malicious Nodes for Permissioned Private Blockchain Networks

The main objective of this paper is to propose a consensus mechanism, based on trust, for permissioned private blockchain networks. The proposal shows how the use of the cooperativeness of the network nodes is fundamental for
the development of a control system, in which the behavior of the nodes is monitored by other nodes. The monitoring of
the reputation score is constant in the network and through voting, the node considered malicious to the network is
expelled. For the mechanism to work, it is necessary to define rigidity criteria to be applied to actions identified as malicious what are the confidence threshold adopted and what grade receives a node that has not yet been evaluated by the network. Also, determine how many nodes are needed to monitor the behavior of a Malicious Node (MN), in order
to identify and expel it more efficiently. The objectives of this work are also to present the performance evaluation of
two platforms for the development of permissioned private blockchains in relation to the validation time of a
transaction, the response time to chain searches and the transaction mining time and to propose a use case blockchain technology for application in the storage of electronic medical records in a hybrid approach, which combines the application of public key infrastructure with blockchain technology, to comply with the storage requirements of medical data and offer patient-centric data privacy and access control.