VaNetChain: A Framework for Trustworthy Exchanges of Information in VANETs Based on Blockchain and a Virtualization Layer[J] APPLIED SCIENCES-BASEL 2020(10) Vintimilla-Tapia, Paul Bravo-Torres, Jack Lopez-Nores, Martin Gallegos-Segovia, Pablo Ordonez-Morales, Esteban Ramos-Cabrer, Manuel