The study aimed to explore the educational experiences of mentors and experts in science and engineering fields, who voluntarily participated in the EKC youth science camp on appropriate technology using blockchain. In the EKC camp, undergraduates or graduate students, mainly residing in Europe, participated as mentors to support youth participants’ learning. Also, scientists/engineers with more than ten years of career experiences in the fields, collaborated with educators to organize and implement the camp program. Individual interviews with seven mentors and five scientists/engineers were collected with field-notes. The study results showed that mentors and scientists/engineers demonstrated a broader understanding of appropriate technology. They had come to realize that appropriate technology was not limited to technologies to help developing countries, but it could pursue broader purposes and values for many people located in diverse situations if the technology fit to local demands and contexts. The mentors had opportunities to explore their future career through their close encounter with senior scientists and technologists, In the meantime, the scientists and engineers had the opportunities to consider their roles and societal responsibilities while actively communicating with future generations.