Аннотация:Welcome to the last issue of the IEEE Transactions on Computational Social Systems (TCSS) of this year, with a special focus on "blockchainbased secure and trusted computing for IoT." Here, we have 18 regular articles and a brief discussion on social intelligence. I would like to take this opportunity to thank and congratulate everyone, especially our editorial board for a great job well done. Looking forward to working with you all in 2020!
