Abstract

     Data storage for attendance at a company or agency is usually stored in a local or cloud database. This type of storage has several issues, such as privacy and data integrity, because several parties will fully regulate privacy and data integrity. Therefore, a data storage system is needed that can provide privacy, security, and data integrity to maintain the authenticity of sensitive data. This study wants to develop to implement blockchain technology to store employee attendance data from the HR department in a company. Employee attendance data is taken from the Angular web application integrated with a permissioned blockchain framework called Hyperledger Composer. This study chose Hyperledger Composer because this type of blockchain has a fast validation time. Hyperledger Composer has a Representational State Transfer Application Programming Interface (REST API) named composer-rest-server, which allows Hyperledger blockchain to interact with other components. The implementation results show that Hyperledger Composer can be functionally used as data storage for the attendance management and Payroll system. In addition, Hyperledger Composer performance is measured by evaluating block transaction times. The evaluation of the Hyperledger Composer is done in three ways: directly within the Hyperledger Composer, using the Angular web application through the REST API, and using JMeter through the REST API. As a result, testing for making transaction blocks varies from 1 – 17ms on an experiment directly in Hyperledger Composer, 5 – 296ms through the REST API using JMeter tools, and 1 – 4270ms through the Angular Web Application. The result shows that the performance of the REST API produced by the composer-rest-server is recorded faster than Ethereum. With these results, composer-rest-server can handle systems that require fast transaction times, such as voting systems, health monitoring, and the Internet of Things (IoT) application, because the average time to conduct transactions is still under one second. Thus, Hyperledger as attendance data storage can provide privacy and data integrity.

Introduction

     Blockchain is a distributed digital ledger technology that Nowadays, the development and use of technology are developing more rapidly in various fields, one of which is information technology. Information technology is a technology used to get, store, organize, process, and manipulate the amount of data to produce relevant and accurate information. The attendance management and payroll system are some of the information systems on financial activities required in a company or agency. The use of this information system can provide an accurate report of attendance records and payroll. The attendance management and payroll system is a system that processes the attendance information to determine the total salary of each employee. Attendance data is sensitive information that must be maintained for authenticity because it can affect the number of salaries to be paid.

Conclusion

     The blockchain attendance management and payroll system design can be well implemented. All functions of the Hyperledger Composer component and the Angular web application are running properly and according to the design. Hyperledger Composer can communicate with the other components through the REST API provided by the composer-rest-server. The REST API provided by composerrest-server performs well through JMeter with an average transaction time of 198ms and the total time required for 100 transactions of 1.98 seconds compared to Ethereum Blockchain. Blockchain technology can support the attendance and payroll system, so this system has advantages in data security and data integrity.