## 1 Introduction  
According to Article 1, Number 7 [1] of the Indonesian Constitution concerning Basic Archival Requirements, archives are texts which are made and accepted by state institutions and government agencies in any form, whether in a single or group condition, in the context of carrying out government activities. Archives are essential because of the substantial information they offer in the administrative process. Therefore, they should be managed properly; for instance, there should be an orderly, neat storage system and a way to retrieve, recover, and secure the archives. An excellent archive management system leverages the organization in question, such as the government, to work efficiently. Nowadays, many people use information technology to help manage archives. Cilegon E-Archive (CEA) is a local government archive management system in Cilegon City, West Java, Indonesia. It has features for managing the archives, including their collection, retention, and retrieval. Figure 1 illustrates the mapping of the CEA system. It is located in Serpong, in the south of Tangerang City. However, the archive users are in Cilegon City, which is 99.4 km from Serpong. In Indonesia, archives are important instruments in the auditing process. The Badan Pemeriksa Keuangan (BPK), as Indonesian the government auditor, audits the archives at least once a year. Even though the system server is located near the BPK, the BPK must go to Cilegon because the BPK does not have access to the system. Moreover, the BPK prefers to inspect printed archives that are stored in a physical storage unit in Cilegon City, because there are many archival forgeries in Indonesia. The CEA system is a centralized system that is located on a single cloud server belonging to Badan Pengkajian dan Penerapan Teknologi (BPPT), which is the Agency for the Assessment and Application of Technology in Indonesia. A centralized system uses a client-server architecture in which nodes connect to one server and are controlled by the network administrator. It makes it easy to track and manage the data. However, a centralized system has several vulnerabilities, such as a single point of failure, low data availability, and lack of data confidentiality. A single point of failure is a condition in which the entire system stops working when the server goes down. The clients cannot connect to the server, so the system cannot process requests to provide data. Moreover, if there is no backup, users can lose data immediately. Therefore, it can cause low data availability. A good archive management system should consider data confidentiality in order to ensure data can be accessed only by registered users. The existing CEA system has a feature to manage user control. The archivists are allowed to alter the archives in their respective units. Even so, this system cannot guarantee whether the modifications are valid. This condition triggers archival forgeries; because the data and files are only stored in the server without any encryption, they are not secure and unauthorized users can replace legitimate files with fake files or modify the data. Considering these issues, this paper integrates the Interplanetary File System (IPFS) and blockchain. IPFS is a distributed file storage system that uses content-based addressing and guarantees high-throughput by combining a distributed hash table, BitSwap exchange protocol, and naming system [2]. Blockchain has a consensus mechanism to validate the transactions and guarantee the integrity of each node [3]. In turn, the transactions are unchangeable. Nevertheless, blockchain has limitations in data storage, and there are costs of executing transactions. The cost depends on how big the stored data are. This paper proposes a new CEA system, using a decentralized architecture. It integrates IPFS and blockchain technology. IPFS shares the files with other nodes in the network instead of only storing the files in one server. Pinning service is a feature of IPFS that ensures high availability and long-term retention.