Abstract
Due to the cheap price and decent performance of used cars, the second-hand vehicle market is quite active in Taiwan. However, the vehicle information in the market of second-hand vehicles is centralized at present. In other words, the vehicle information is still provided by the second-hand vehicle dealers, which are not transparent and have no tampering cost. As the result, the authenticity, accuracy, and fairness of these second-hand vehicle data are worth discussing. To solve the above problems, this paper proposed a trusted vehicle data source system based on blockchain technology. The system is built on the Ethereum platform with the private chain structure. With the help of our platform, a trusted third party (e.g., maintenance plant and government branch) can record vehicle information into Blockchain so the integrity of vehicle information can be maintained. Customers can easily query the relevant vehicle information through our system interface and avoid receiving fake vehicle information. This system is a Proof of Concept (PoC), and the feasibility is examined by evaluating transactions per second (TPS) of the proposed system.
Highlights
The second-hand vehicle market is quite active in Taiwan
(1) Transparency of vehicle condition information: Our system is based on the Proof of Authority (PoA) consensus of Ethereum so that the condition information of vehicles can be stored on the private blockchain of Ethereum by specific users, and the information recorded on Blockchain is transparent to everyone in this private network
(2) Access control of smart contract and tamper proof of blockchain information: Because our system must rely on the help of some specific users to record or update the information of vehicle condition to change the state of smart contract, we must only allow these specific users to update the state of smart contract; so, we use the conditional branch in a smart contract to judge whether the transaction sender has the permission to change the state or not, so as to achieve the access control of the smart contract
Summary
The reason is that the second-hand vehicles are relatively old, they still maintain good performance due to the technological advancement of the automobile industry. Coupled with their relatively inexpensive price, many people will still consider used vehicle when purchasing a car. In the second-hand vehicle market, the most common situation which customers encounter is that they do not know whether the information of vehicle condition provided by the secondhand vehicle dealer is consistent with the actual condition and result in buying vehicles with problems (e.g., odometer fraud and accident vehicle). By the properties of transparency and tamper proof of blockchain, customers can use the system proposed in this paper to check the actual vehicle condition without being worried misinformed by second-hand vehicle dealers
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