Journal Pre-proof Securing Cognitive Radio Networks using blockchains Adnan Sajid, Bilal Khalid, Mudassar Ali, Shahid Mumtaz, Usman Masud, Farhan Qamar PII: S0167-739X(19)31599-7 DOI: https://doi.org/10.1016/j.future.2020.03.020 Reference: FUTURE 5525 To appear in: Future Generation Computer Systems Received date : 16 June 2019 Revised date : 25 January 2020 Accepted date : 7 March 2020 Please cite this article as: A. Sajid, B. Khalid, M. Ali et al., Securing Cognitive Radio Networks using blockchains, Future Generation Computer Systems (2020), doi: https://doi.org/10.1016/j.future.2020.03.020. This is a PDF ﬁle of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the deﬁnitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its ﬁnal form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2020 Published by Elsevier B.V.