The International Conference on Cryptography and Blockchain (CRBL 2021) will take place October 29-30, 2021 in Vienna, Austria. The conference will provide a forum for presenting innovative ideas, approaches, and research related to cryptography and blockchain. Topics will include blockchain foundations, consensus algorithms, privacy, and applications in areas like IoT security. Authors are invited to submit papers by September 18, 2021 for peer review and possible publication in the conference proceedings or related journals.