Abstract: The technical characteristics and working principle of block chain are analyzed,combining with distributed network nodes and refering to information capability evaluation system.By studing the implementation principle and complexity of these methods,this work summarizes their suitable environment and advantages and disadvantages,and proposes a evaluation trust model of block chain information capacity based on subjective logic(ETMBCIC-SL).This model introduces Jφsangs Subjective Logic to detect the block chain accounting behavior,to solve the dynamic trustworthiness problem of the block chains privilege control,and to dynamically detect the block chain privilege control through independent viewpoint and dependent viewpoint.The simulation results show that the model has high completeness,accuracy and instantaneity.

Key words: block chain, distributed network, subjective logic, privilege control