A blockchain is a decentralized digital ledger that saves transactions on thousands of computers around the globe. These are registered in a way that inhibits their subsequent modification. Blockchain technology increases the security and speeds up the exchange of information in a way that is cost-effective and more transparent. It also dispenses with third parties whose main role was to provide a trust and certification element in transactions (such as notaries and banks).The high importance of blockchain has attracted the attention of organizations in different sectors, with banking sector being the most active at this stage. Blockchain has resulted in the development of thousands of new job positions and new startups ranging from mobile payment solutions to health care applications.