The next-generation Internet of Vehicles (IoVs) seamlessly integrates humans, vehicles, roadsideunits (RSUs), and service platforms to improve road safety, enhance transit efficiency, and deliverconvenience while preserving environmental sustainability. However, the frequent handoversbetween RSUs in IoVs expose communication to insecure public channels, rendering the systemsusceptible to various security threats and attacks. To address these challenges, we proposea blockchain-enabled light weight handover authentication (FLEX-HAND) scheme. FLEX-HANDensures secure handover of traffic information during vehicle transitions between RSUs using alightweight mutual authentication and key agreement protocol, supported by blockchain technology.The mechanism enables vehicles to authenticate anonymously and securely exchange sessionkeys with the next RSU during the handover process, preserving data integrity and confidentiality.A trusted cluster head aggregates the data, which is securely transmitted to the nearby RSUusing the established session keys. The RSU communicates with a cloud server (CS) for furtherdata aggregation and transaction generation. These transactions are structured into blocks and validatedusing a voting-based consensus mechanism within a peer-to-peer network of cloud servers,ensuring tamper-resistant data storage on the blockchain. Through rigorous informal security analysisand formal verification using the random oracle model, FLEX-HAND is demonstrated to beresilient against a wide array of security attacks, including impersonation, replay, and session keycompromise. Comparative studies highlight the superior performance of FLEX-HAND over existingapproaches, offering enhanced security, functionality, and reduced communication and computationoverhead. Furthermore, blockchain simulation validates the practical feasibility and efficiencyof the proposed handover authentication scheme in dynamic IoV environments.