Bim and blockchain a possible contribution for the security of building heritage system

Blockchain technology originates with the creation of Bitcoin and technically indicates a sequence of data divided into blocks connected in a chain. This chain is immutable and each block is linked to the previous one and to the following one thanks to a system of hash codes, developed to prevent fraudulent actions. This technology has aroused great interest mainly for its interaction model based on a distributed trust system, characterized by the absence of a "trusted" third party. Due to the great security of the data stored in the blockchain, many companies that produce products subject to counterfeiting, have adopted this technology to protect their final product. If well designed and implemented, the blockchain can be exploited in various digital fields, including BIM which has revolutionized the construction world, creating a strong collaboration between all the players involved in the design process. Implementing BIM with blockchain would solve the problems of intellectual property of a project, privacy and improve trust between those who sign a contract. This paper describes the main critical issues of BIM and how the blockchain could make them strengths, provided that this technology is technically and legally implemented to allow for the development of Smart Contracts, contracts written in computer language and made secure thanks to the of the blockchain.