Internet of things application(IOTA)is a classic blockchain system based on the directed acyclic graph rather than chain structure.Due to the adoption of confidence consensus,transaction confirmation depends on the central node and it is difficult to find conflicting transactions in time.Therefore,this paper proposes a design method based on time slice.It is specified that the current transaction subgraph is checked and synchronized by the internal node at the end of each time slice.A high quality IOTA(HQIOTA)consensus mechanism is designed.In the transaction confirmation,the adaptive control of internal nodes is designed to replace the transformation of the original external specified threshold.Then the contradictory transactions can be found and deleted in time,and the problem of being insensitive to conflicting transactions can be solved.In this paper,experiments are carried out in the network environment based on the probability distribution simulation.The results show that the HQIOTA can find transaction conflicts faster and confirm transactions more flexibly than IOTA.
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