Secure IoT via Blockchain

Abstract Block chain technology had gained popularity because of its use in crypto-currencies like bitcoin. Today uses blockchain are growing number areas banking, industries, health centers and even security IOT. Moreover, the IOT is exponentially every year with aim 5G technologies e- health, smart homes, distributed intelligence etc. but it faces challenges privacy. The privacy a user data at risk (i.e. IoT) centralized client-server model. This approach server poses serious vulnerability to security. attracts attackers enter into network invade through schedule attacks or inject malware. It indicates that central architecture IoT possess compromised confidentiality, integrity, which disrupts as widespread adoption this technology. Therefore, essential evade hostile for enhance implies need decentralized maintain data. can be kept different users without any control help blocks suggested by Blockchain. paper addresses various issues how block helps solving these issues.