Abstract
In this research, we developed a land certificate security system based on blockchain technology and a qr code validation scheme to prevent counterfeiting of land certificates and illegal levies in the process of making land certificates in Indonesia. The process of making land certificates is currently still being carried out by involving various related parties so that it requires a complex and long process. This triggers cases of illegal levies carried out by related parties on the grounds of speeding up the process of obtaining land certificates, thereby reducing the transparency aspect. Conventional paper certificates are prone to forgery and easy to lose, besides that electronic certificates designed by the government still use the concept of a centralized system, so they are vulnerable to being hacked. Another problem is the falsification of ownership of land certificates by the land mafia. Therefore, a land certificate security system is needed for the online land certificate data storage process. From the test results, it was found that the system built with the implementation of blockchain technology guarantees data validity, based on verification by smart contracts and consensus mechanisms, and ensures that processes that occur in blockchain-based systems are guaranteed transparency, data is stored globally in a peer-topeer and immutable.
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