2025 7th Blockchain and Internet of Things Conference (BIOTC 2025) aims to provide a forum for researchers, practitioners, and professionals from the industry, academia and government to discourse on research and development, professional practice in Blockchain and Internet of Things. BIOTC 2025 will be held in Tsukuba, Japan during June 25-27, 2025. Welcome scholars and researchers working in the field of Blockchain and Internet of Things from all over the world to attend the conference and share your experiences and lessons with other enthusiasts, and develop opportunities for cooperation.