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Abstract
The technology behind the Bitcoin crypto-currency system is Blockchain (BC), is considered to be both powerful, attractive and critical for ensuring enhanced security and privacy for applications in many other domains - including in the Internet of Things (IoT) eco-system.But in some implementations, it is not traceable. It is currently being conducted in both academics and industry applying the Blockchain technology in applications. We can give Ensuring for BC security by maintaining a digital ledger of transactions in Proof-of-Work (PoW), a cryptographic puzzle plays a vital rôle.so that it is to be incorruptible. Furthermore, BC uses a changeable Public Key (PK) to record the users’ identity, which provides an extra layer of privacy, so that BC provides more security.