How does blockchain work and has its usefulness been over or under estimate’’s editorial boards. From January 2015 to January 2018 he served as the Project Coordinator for the European Data Science Academy which aimed to address the skills gap in data science across Europe. Sajida Zouarhi is an Engineer and works as a Blockchain Architect at Consensys. She is also a Computer Science researcher and worked with a major Telecommunications Operator (Orange) during her PhD thesis in Grenoble about private data transmission over communication channels on complex systems. She is President of the eHealth and BlockchTain Think Tank and a technical advisor on the board of several Blockchain projects. As the founder of the Kidner Project, she collaborated with WHO to help prevent Kidney Trafficking using Blockchain technology. She is an international Hackathon Mentor and a hackathon organizer with the Blockfest that she co-founded in 2016 in France. These talks and Q&A were filmed in the Ri on 24 September 2018. --- A very special thank you to our Patreon supporters who help make these videos happen, especially: Alessandro Mecca, Ashok Bommisetti, avraham chein, bestape, Elizabeth Greasley, Greg Nagel, Lester Su, Rebecca Pan, Robert D Finfrock and Will Knott. --- The Ri is on Patreon: https://www.patreon.com/TheRoyalInstitution and Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://www.rigb.org/home/editorial-policy Subscribe for the latest science videos: http://bit.ly/RiNewsletter