In the current social and technological context, the proliferation of content creation led to easy spreading of misinformation and fake content. This poses an important threat to individuals and even countries or democracy itself. This paper presents a novel proposal for ensuring content provenance and authenticity by leveraging blockchain technology. Besides blockchain, we make use of digital signatures and signature preservation services, integrated through standard interfaces. The proposed framework is designed to accommodate various content formats: text, image and video. After a comparison with similar solution, we also detail a discussion analysing limitations, opportunities and advantages or our approach. To sum up, the proposed framework outlined in this paper offers a robust and standard-compliant mechanism to ensure the provenance and authenticity of digital content, thereby addressing the pressing challenge of disinformation.