Table 8.

Node types and roles.

Node Type	Assigned Role
Full Node	Fog servers Has multiple functions Registers and maintains records of devices Calculates trust values Reviews, generates, and distributes global trust list Stores and maintains trust values in the blockchain
Root Node	Acts as a link between the device layer and fog layer Receives trust parameters from lower nodes Distributes updated trust list to lower nodes for the elimination of malicious nodes
Resource-Constrained Node	Resource-constrained device Performs only assigned tasks