Distributed ledger is a database in which various information is stored in a decentralized manner. A "Distributed Ledger" (Distributed Ledger), also known as "Distributed Ledger Technology" or DLT, is a database in virtual space that is shared between a network of several interconnected computers. In many developed countries, efforts have been made to accelerate and facilitate online scoring by developing smart contracts. Countries such as the United States and England have not only changed the situation from the traditional registration system to electronic registration by enacting new laws, but also by using new technologies, they have established a new registration system using smart contracts on the blockchain platform. In Iran, although new laws such as the Limitation Law have been put in place to further develop electronic registration, the use of new registration methods in the context of blockchain using smart contracts requires technical fields and infrastructure and smart contracts. Smart contracts are electronic contracts that have unique features such as security, monitoring, exchange efficiency, no need for the involvement of financial and commercial intermediaries compared to other electronic contracts. The implementation of the process of concluding these contracts in distributed ledger technology is based on paying attention to the challenges of this field, including how to ascertain the time and place of concluding these contracts, challenges related to defects of will, responsibility system and risk acceptance system. Solving these challenges can make the acceptance of these contracts in the online scoring system smoother. In this article, an attempt has been made by using the latest published scientific works and a review of the online scoring system and distributed ledger technology based on smart contracts, capacities, platforms, challenges, shortcomings, inadequacies and existing solutions.