Maritime affairs has not experienced significant technological changes for years, despite the existence of numerous revolutionary technologies. Blockchain is a technology that, with regard to maritime features, offers a much faster processing and documentation, greater savings and security. This thesis describes the importance of using blockchain technology in maritime affairs. The basic features of the blockchain technology are described, as well as the importance of smart contracts. The significance of the blockchain technology of marine technology is great, and this thesis outlines the advantages, as well as the disadvantages of this technology when it comes to shipping. Some of the projects that offer sea change with block technology include: CargoX - a platform for creating a smart Bill of Ladings, the Morpheus Network - a platform for easy logistic processes, the Blockshipping - a platform for more efficient container management. Maritime ports are also part of the maritime system modernization and digitization are needed, the blockchain technology is the ideal solution for improving the operations of maritime ports.