After 8 sessions, our seminar series has concluded. Thank you for your participating in, contributing to, submitting to, speaking at, helping with, or interacting at Theory and Practice of Blockchains 2021. On behalf of everyone, I thank you for your efforts. The website and this mailing list will remain active, waiting for future editions. Recordings of talks are available on the TPBC Youtube channel https://www.youtube.com/channel/UC_twxak5nXJrG-krI2c8YJA/videos It is the hope of everyone that conferences may take place again in-person next year. The TPBC Steering Committee (which a subset of this year's program committee) is interested in finding a venue and organizers for TPBC 2022. If you would like to volunteer, please get in touch with us immediately. Best regards, Christian Cachin