Ethereum Smart Contract (SC) is a sophisticated technology that enhances the scope of BlockChain automation. However, SCs’ vulnerable programs have marred BlockChain’s nascent technology’s brighter aspects. Two critical hacks, the DAO attack, caused by reentrancy vulnerability, and the Parity attack, caused by unprotected selfdestruct and frozen Ether vulnerabilities, are famous for their historical cryptocurrency frauds. DAO attack robbed a sixty million dollar amount of cryptocurrency from the victim’s account. But the Parity attack created a new trend in software vulnerabilities by freezing a thirty million dollar amount of Ether. In fact, the Parity attack wiped out the library SC. Subsequently, all the SCs, depending upon the library functions (e.g., the Parity SC’s Ether transfer), became paralyzed, which locked the investors’ funds. This paper enhances our dynamic analysis tool, TechyTech, to detect the Locked Ether (i.e., Frozen Ether) vulnerability. Furthermore, TechyTech adopts a transfer-based approach and uses case studies to compare TechyTech’s performance with Remix.

The Internet of Things (IoT) has already changed our daily lives by integrating smart devices together towards delivering high quality services to its clients. These devices when integrated together form a network through which massive amount of data can be produced, transferred, and shared. A critical concern is the security and integrity of such a complex platform to ensure the sustainability and reliability of these IoT-based systems. Blockchain is an emerging technology that has demonstrated its unique features and capabilities for different problems and application domains including IoT-based systems. This survey paper reviews the adaptation of Blockchain in the context of IoT to represent how this technology is capable of addressing the integration and security problems of devices connected to IoT systems. The innovation of this survey is that we present a survey based upon the integration approaches and security issues of IoT data and discuss the role of Blockchain in connection with these issues.