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This research examines the application of the Elliptic Curve Digital Signature Algorithm (ECDSA) in a blockchain system as a security solution for digital payment systems in Indonesia. Using a descriptive-qualitative approach based on literature review and conceptual simulations using Python, this study discusses the working principles of ECDSA, its advantages over other digital signature algorithms, and the challenges of its adoption in Indonesia. The results show that ECDSA provides high cryptographic efficiency, maintains transaction authenticity and integrity, and supports a transparent decentralized system. The academic simulations include not only KYC processes, top-ups, transactions, validation by validators, and block recording, but also demonstrates the formation of an interconnected multi-level blockchain and tests scenarios for rejecting manipulated or invalid transactions. The contribution of this research lies not only in the theoretical review but also in the implementation illustrations that can be used as a basis for education and the initial development of blockchain-based digital payment systems. The research results show that ECDSA is capable of providing a high level of efficiency in the encryption and transaction verification process, maintaining data integrity and authenticity, and supporting a decentralized and transparent system. The academic simulations included the KYC process, wallet creation using ECDSA keys, balance top-ups through bank integration, transaction creation and validation, and block recording in the blockchain. Specifically, the simulations successfully demonstrated how new blocks are added to the chain by referencing the previous block's hash, as well as how transactions with corrupted signatures, manipulated amounts, or insufficient balances are automatically rejected by the validator consensus mechanism, maintaining system integrity. This research contributes not only theoretically, but also through conceptual representations that can be used as an educational foundation and for the initial development of blockchain-based digital payment systems in Indonesia.

Decision support system of credit giving is a computer-based information system that can be used as a tool for manager of the credit department to decide received  whether or not the loan application that submitted by customers. In the decision support system of credit giving uses principles of assessment called the 5 C. The 5 C are character, capacity, capital, collateral,  dan condition. Principles of  the 5 C will be taken for credit giving consideration. While preference for the weighting of criteria using Analytical Hierarchy Process. Overall, the existing process on the decision support system  of  credit giving is manager assigned the criteria, sub criteria, sub-sub criteria and the score. Then manager give preference of criteria to generate criteria weights. The data has been inputted by manager is used by staff of credit department  to perform the assessment so that can be produced a credit decision is received or rejected.