The emergence of novel networks, namely Sixth Generation (6G) technologies, promises advanced connectivity, high data rates, and improved reliability. However, such networks must use large portions of the electromagnetic spectrum to deliver the promised services. Moreover, in the telecommunication context, the electromagnetic spectrum is considered a limited resource; its scarcity demands strategies and (quasi-)optimal allocation collectively guided by regulatory, technical, and market domains. Existing spectrum management solutions, such as spectrum databases, face data volume, velocity, variety, quality, privacy, and trust challenges. To overcome these challenges and consequently make spectrum databases prone to real-world scenarios, herein it is proposed a novel architecture integrating geolocation data, propagation models, Web services, and decentralized spectrum data processing (Blockchain). This chapter presents an architecture for a decentralized spectrum database that can be leveraged to facilitate the rapid development of economic and social activities through broadband wireless services provision. It is also described a Brazilian test case, the unused digital Television (TV) spectrum (TVWS), to validate and test the proposed architecture to create novel digital inclusion mechanisms.