Overview of centralized and decentralized head ledgers (distributed)

General ledgers are ledgers, which are used in companies and organizations to store customers' financial transactions, personal details in the form of records. In terms of applied technology, general ledgers are divided into centralized and decentralized categories. Of course, in general, decentralized general ledgers are also referred to as distributed general ledgers, but in reality, they are different, each of which is described in detail below. Distributed head ledgers have unique applications in many areas; It is used in IoT technology to increase and improve security. In this paper, a review study of centralized and decentralized and distributed systems, types of general ledgers based on distributed systems (Blockchain, Tangel, Hash graph, Tempo) is discussed