JISE

Blockchain has consolidated its status as one the most disruptive technologies of the last few years. Recent attacks on blockchain, are constantly being identified, highlighting the need to strengthen their security. For that reason, security of blockchain technology is now more than ever in the spotlight. The high economic impact on cryptocurrencies and the sensitive information proposed to be handled by their networks (i.e., implementation of notaries, electronic voting, …) make security an essential aspect. This paper aims to determine the main security problems which have been identified in blockchain by following a well-known methodology called “Systematic Mapping Studies”. Systematic Mapping Studies are designed to convey an outline of our analysis space through classification and investigating contributions regarding classes of that classification. This work aims to address the main security problems in blockchain technologies and analyze their solutions. Finally, a proposal was made to define a model of improvement in the security of blockchain. The purpose of this model is to allow a better understanding of the security concepts and the typical structure of this kind of environment.