  With the advent of Intelligent Transportation Systems (ITS), data from
diverse sensors either embedded into the vehicles or present along with the
smart city infrastructure, are of utmost importance and require both processing
power and efficient trust mechanisms for information exchange in
vehicle-to-everything (V2X) communications. To accomplish these requirements,
both edge computing and blockchain have been recently adopted towards a secure,
distributed, and computation empowered Internet of Vehicles (IoV). This paper
surveys prominent solutions for blockchain-based vehicular edge computing
(VEC), provides a taxonomy, highlights their main features, advantages, and
limitations to provide subsidies for further proposals.
