TUM Blockchain Club is co-hosting the 0xCastle research retreat. It is a 5-day program focused on blockchain education and research, set in a historic castle near Leipzig, Germany. A selected group of researchers, developers, and technical blockchain enthusiasts will convene post-ETHBerlin (May 26-31) to educate, research, and connect. Focused on pivotal blockchain questions in topics like privacy, scalability, and interoperability, the retreat integrates a mix of talks, workshops, and research groups. Tailored for knowledge sharing between participants, 0xCastle will enable interdisciplinary developments upon these prescient research questions.