Data security is very important today, because the amount of big data is increasing day by day, forcing every sector to review its security system. The security of SIM and STNK documents is always associated with the authorities. This authority can be public or private. In this country, in the transportation sector, the security of driver's license and vehicle registration documents are given to two private company authorities. Among them are Presprint PI for SIM and High Tech Telesoft for STNK card. Its purpose is to prove the authenticity, availability, and confidentiality of the SIM or STNK holder. However, until now, the security of these documents is still facing obstacles, such as the presence of several individuals who have fake driver's licenses or fake STNKs. Sometimes with the involvement of a particular system manager, the time it takes for the applicant to get a driver's license or STNK card, data management must be secured by one authority. Faced with this situation, to ensure that only qualified people who have the appropriate driving training certificate and have the original driver's license can be allowed to drive the vehicle. System security is optimized through the use of blockchain technology, in data management transparently and without central authority.