There are many ways to prevent external intrusion, but Blockchain is selected as one of the technologies that have attracted attention recently. Blockchain connects details programmed as data blocks. Since the connected blocks are encrypted while containing common information, data modulation is virtually difficult. To modulate one, all data must be modulated. The reason for the high reliability of this technology lies in this data chain structure.
If a blockchain is introduced as a security system for the IoT, a data chain that cannot be tampered with will be established for each device, making intrusion between each device theoretically difficult. As problems may arise during the verification process, various verification methods are being introduced to improve completion.