The main purpose of the paper is to discuss the nature of the enterprise architecture of the blockchain platform (EAoBP). The authors also highlighted how the main technology challenges for enterprises are addressed through the proposed solution. The paper consists of the introduction and 3 chapters. Chapter 2 presents related works about the blockchain technology and defines the platform concept. The architecture layers which are required to build the enterprise blockchain platforms are described in the 3rd chapter. The 4th chapter constitutes the implementation aspects of the EAoBP. The permissioned blockchain systems leverage a cross-organizational collaboration model, what constitutes cooperation within the network without 3rd party authorities. The open source character of the implementation technology and the clear guidance of the scope of each layer clarified in the article should help businesses in applying the concept.