Blockchain (BC), the technology lurking behind the Bitcoin crypto-currency system, is considered to be both alluring and critical for ensuring increased security and privacy for diverse applications in many other domains including in the Internet of Things (IoT) eco-system. Intensive studies {presently|at present|at the moment} being conducted in both academia and industry making use of the Blockchain technology in multifarious applications. Proof-of-Work (PoW), a cryptographic puzzle, {performs|takes on} an essential role in ensuring BC security by maintaining {an electronic|an electronic digital|searching for} ledger of transactions, which is considered to be incorruptible. Furthermore, BC uses {an adjustable|an unpredictable|an unpredictable, uncertain, changing} Public Key (PK) to record the users' {identification|personality|id}, which provides {an additional|extra|another} {coating|level|part} of privacy. With cryptocurrency has the successful {ownership|re-homing|usage} of BC been {applied|executed|integrated} but also in {diverse|complex|multi-dimensional} non-monetary systems such {as with|such as|just as}: distributed storage systems, proof-of-location, healthcare, decentralized voting {and so on|etc|and etc .}. Recent research articles and projects/applications were surveyed to {examine|determine} the implementation of BC for {increased} security, to identify associated {difficulties|problems|issues} {also to|and} propose solutions for BC enabled {increased} security systems.
